Slot car Lapcounter/timer

Good morning wise folks, Looking for ideas for a Slot car lap timer. I have a great set up using an old PC,but we are going portable and moving all that stuff is a pain. What would be cool is a stand alone for 3 lanes that could count laps,display lap time and remember fastest lap time. Oh and it needs to cost less than $20 per lane. Have some ideas?

Posted by 2FER SLOTS 7 years ago

Portable, Tiltable Art Desk?

One of my biggest problems with full size art desks is that they never seem to be stable. They wobble around and it quite an annoyance of mine. What I would like to know, is is there any way I could make a lap desk that could stand on its own and raise up and down without me having to jam it into my gut to hold it up? I've looked around and haven't found exactly what I'm looking for...

Posted by ultranima 10 years ago

RC Car/truck Lap Timing

I would like to know what people would suggest as to what hardware to use to try to make a wireless RC timing system, Single car use at first but might scale up to race standards? The currently available hardware costs a lot, and is usually to dear for a home user! What it needs is a wireless transpoder in the car/truck (maybe rfid/bluetooth) that when it passes a certain location it updates the time on a counter (usb/bluetooth to laptop/phone, or arduiono based???) Any ideas??? William (Slim19198)

Posted by slim19198 6 years ago

How to fasten galvanized pipes?

Hi there, I have a lot of galvanized conduit of various diameters that I found in a dumpster. I would very much like to know how to fasten one pipe to another so I can make stuff with it.Welding: I've read on instructables and elsewhere that you will become quite ill if you weld galvanized materials due to the evolved zinc fumes. Are respirators an option?Lap Joints: I thought of trying to make a lap joint by cutting out matching "half rings" from the pipes, overlaying them, and then bolting them through. I'm stuck as to how to make that cut though. I could do it in wood, it seems like metal would be trickier. Any thoughts?I'm being forced to move the pipe in a week or so; any off-the-cuff ideas would be fantastic, thanks!

Posted by post.haste 9 years ago

Inspiration: Lego lepdesk with storage

I was digging in my closet and found one of these. Basically it is a lightweight sort of flimsy plastic lap desk with two bins on either side and a track setup on top that fits Lego Plates. The plates slide into the middle to build, and slide shut over the bins for transportation. It can be carried like a suitcase. The user's legs sit in between the two bins and that hold the desk steady for building. This is definitely sized for a little kid, not a 6 foot four guy like myself. Lego made these back in the late 90's, no idea if they still do. You can find them online for exorbitant sums of money, $30-$60 US. A great design, and I am inspired to make some kind of work table. Seeing that these things are apparently collectible, I am going to sell this, then build a larger more durable adult version for all kinds of work with the money from selling this one. Sharing this here because I find this to be a nice and simple design that everyone can learn from. Any ideas? Lets hear them! I am envisioning some kind of clone of this made of medium-weight plywood or other material, with the leg space in between the bins used to hold another storage box that can be easily popped out. I really don't have the tools to do this project very cleanly, but hopefully soon I will make an initial model. For those lucky people out there with CNC machines, this is your chance to cut out something awesome. Take the idea and run with it.

Posted by ilpug 6 years ago

Slot Car Lap Counter using Hall Effect Sensor & Arduino

Hi guys, For a university project I am using a hall effect sensor to count laps of a slot car. I am hoping to count the laps and output the number to a 7 segment LED display. However I am very new to coding and arduinos themselves. I was wondering if anyone had any similar projects or knows of any code I could use or any ideas people may have for a potential solution. Any response would be greatly appreciated. Thanks.

Posted by TomR77 2 years ago

old laptop

I have scrapped a old lap top but saved the hdd is there any way i can connect this to my new laptop to get my work info off it is there a way of connecting by cables ie plug from the hdd down to a usb so i can plug into my lap top any help would be welcome many thanks kovako2007

Posted by kovako2007 10 years ago

The Space Shuttle flew in front of my house this morning

Shuttle Endeavour flew over Oakland as part of its victory lap this morning, and I took these pictures.  

Posted by ewilhelm 5 years ago


I am going to update this in about another day. To all the people out there, and there are literally millions, I have the very best fix for broken hinges on a lap top. My lap top is an HP Pavilion zv6000, but I understand this is very similar to many other models or makes. I have read many frustrating concerns about this INFERIOR hinge design and I agree the manufacturers should foot the bill to repair them. Of course they wont because it would cost them millions of dollars. I just wanted to let everyone know I will submit a full text explanation and some good pictures. The method requires the normal care as you are handling delicate electronics. The time to do the repair is no longer than 24 hours and most of this is to let things setup. The cost for me was $9 and if you do not have the little extras, I know it would never cost more than about $20. The thing I like about this repair, which I painstakingly studied, is that it preserves all of the components, you do not loose the screen or damage anything. I would even suggest you do this fix even if your hinges are good because it will prevent them from ever breaking. I promise you. So please stand by for the update. I am new at posting on the Internet and I would love the news to get out to all who need it. Cheers for now Andy (Delta, BC, Canada)

Posted by my_buddy 9 years ago

Motors, gear boxes and pulleys, OH MY!

We are making a time lapse dolley with an arduino. We need to move a 5 lb camera across a metal frame smoothly to produce a great shot. How can we do this?

Posted by ladymechanika 5 years ago

Fix "Quick Links" on profile pages?

I noticed that the "Quick Links" on our profile pages (to inbox, following and image library) over lap the little grey icon images (now that the website has changed). It's not a really "big issue" or anything, but its something that could get fixed. ;) see image.

Posted by canucksgirl 6 years ago

Looking for project ideas....What to do with a Laptop that wont power up?

While having a clean up I came across an old laptop that wont power on any more. I haven't had a chance to figure out why it won't. A part from throwing it. I'm looking for suggestions what I could do with the components. Any suggestions?

Posted by buster42 10 years ago

Build a gaming monitor from laptop

I have an broken laptop but the screen is still in good shape i want to make it into a monitor i can hook up to my xbox 360 and play in my lap or in front of... iv been pondering how i could but im not good with computers so i hope someone can...

Posted by timnitro 6 years ago

Uses for old dell laptop

So my work throughout out this old dell lap top and I recovered it from the trash. It has no hard rives or ram and the screen is half disconnected from the body, but I want to take it apart and find something to do with it. Im mostly interested in the touch pad on it and because I'm into music I want to find a way to use it to control sound, perhaps by controlling the volume or pitch of a audio signal. Any ideas.

Posted by wickednick 6 years ago

Back arrow nalfunction, and comments rejection frequently.

I use Windows 7. on a lap top  1) The back arrow does not function on Instructable pages as it did two weeks ago. It works sluggishly when I press refresh in the sight bar. I go through many Instructables pages almost twice daily. Such problem is deterrant to free viewing. 2) Frequently the comments section rejects acceptance of my notes. Please help and advise. Best regards 

Posted by Mihsin 5 years ago

hp ze4900 blank screen

The screen on my hp ze4900 lap top is very dark. I can still see it a little but not very much. Is my bulb or is my inverter going out or is it something else. I did not hear a hum and I am not sure about a red glow. I can still see the screen a little but it is very difficult to see. If I shine a light on it I can see it or if it is very dark I can kind of see it. I know there is a "how to take the bulb out and fix it in instructables" but I just wondering if it might be another thing? Also, how do you take the screen apart on this model? Thanks, Carmitsu

Posted by carmitsu 10 years ago

Best LED color to mimic incandescent lighting

Dan, Since you seem to be the wizard with LED's around here I figured I would pose this question to you. So I am creating some paper lamps and I'm looking to power them with ultra bright low power LED's, My goal is to make them green laps with the option to use a battery pack with a solar cell. So with that in mind what do you think would be the best selection of LED's for me, I was looking at the Luxeon Star LED's, but was wondering what color I should go with if I want that incandescent look, I was also thinking of creating a single rgb rig to control the color of the lighting for each lamp, your input will help me decide. Thanks in advance, Joshua AM

Posted by JoshuaAM 10 years ago

"Skinning" 123D cardboard model

Hey fellow Authors, i've been working on the following model for my business, strictly ornamental. I've come this far and don't know how to continue without destroying the time and money already invested. My goal is to cover it with some material and make it look like a statue. Maintaining still a polygonal feel to it. I want to paint it glossy red. I've thought about using fiberglass, plaster, paper (as found in a tutorial in the internet), Cover it with a pepakura mesh. But i'm still not sure how to proceed. I fear fiberglass to be too messy and complicated, plaster could ruin the cardboard dampening it, paper makes it look like a cheap piñata, pepakura would requiere a lot of trial and error to get the pieces to match the "skeleton" and problematic at the end to give it the glossy and professional feeling im looking for. Any ideas guys??   Sorry for the resolution on the first image, I didn't have my lap with me at the time of this post.

Posted by tammasus 3 years ago


I am an bus-boy at an Italian restaurant and once monthly we have event called wine tastings, the waitress goes around and pours wine and every fifteen minutes or so a bus-boy that is brought in just for the event goes around and passes out food on a large tray. Because of labor laws and school (during the school year) the bus-boy's only job during these wine tastings is to pass out food and total the bus-boy is getting paid 6-7 hours wages for only an hours worth of work. Me being lazy and labor cost conscience think that it is just a waste of money to have a bus-boy when a robot could do the job for only the money to charge it up. My idea is to take the iRobot create and add a visual "People" sensor and a weight sensor to make a robo-bus-boy, or a bus-bot, I haven't really decided. In order to do this I will have to wire a series of LED's into a power source. One series of LED's must be blue, signaling a command to take the plates on the bot. Another series must be red signaling to place plates that are finished on there, flashing red LED's will mean that the robot is at weight capacity and will go back to a specified area to unload the trays by the normal bussers. Now the three problems I have not explained yet are as follows: Sliding plates, making a shoulder level, high-class, stylish stand, sensing when the bot is at weight capacity. To make the plates not slide I will use a clear rubber "gripping" substance that I have rolled up from when I had carpet in my computer room. To make the bot stylish and not at all an eye sore I will use an aluminum sheet metal and the waitresses trained style eye. For the weight capacity issue I will wire and electronic scale to the bot and program it to change the LED color when a certain weight is reached and in some cases when the max weight is reached will change the behavior of the bot from making laps around the dinning room to going to the wait station. When at the weight station the bot is reloaded and a reset switch is pressed and the LED change to blue; then laps are resumed and the process repeats till there are no more people left.

Posted by adrewmc 11 years ago

Noob project help, raspberry pi 2 controlling indoor growing environment

Hello everyone, im new to the raspberry pi world. I have raspberry pi 2 module b (the new one with 1g ram) that im not using. i want to use it to control indoor small growing environment. I have 4 x 12v pc fans that i want to control  the speed of, due to the humidity and temperature. I have 3 led bulbs that i want to switch off/on with a schedule maybe in the future i will connect 5 / 12 V small water pump.  and to connect a camera to use time laps. I dont mind of using external power sources for the 12v fans and bulbs. im all new to this world, with the programming i think i will handle, but dont know much about electronics. im searching for easy way to do this,  dont mind of working hard and spending money on this, just need a good ideas and help :) thank you all.

Posted by xzibitil 2 years ago

New site design

I am very displeased with the site design, I don't know when it was implemented, but I am familiar with and happy with the old site design from summer of 2012. I do not like the layout with the steps, the sliding bar at the top of the page that is parented to the top of the browser is annoying me and with whatever new layout you have used to render pages, my browser now lags terribly with simply just scrolling on the page. The part that really pushed me over the edge though and made me post is the picture layout inside the instructables now, the old system worked with the pictures being clickable thumbnails side by side, this new crap of what appears to be a frame in the instructables with the pictures isn't working for me and I am not able to read instructables because the images do not stay in the frame and over lap over paragraphs and cover so much information. If this new design works for people great, but for people like me, I ask that I be given the option to use the old design.

Posted by Allenwr 5 years ago

Got stuff, need ideas!

Hi everyone!  I work in industrial bearing distribution, and every now and then something falls into my lap that I get to play around with.  Today we got a bunch of bearings back that had been made slightly different than the customer had requested.  So, I've got a big box of these things.  There's nothing wrong with them, it's just that the little tapped holes are slightly misaligned and can't be used in the original application.  They are designed to press lightly onto a 5/16" shaft.  The tapped holes are 6-32 thread.  Also, I can easily get cheap 5/16 shafting and I've got a crate full of 5/16 single split and double split shaft collars. My question is, what would you do if had all of these little guys?  I couldn't bear to send them all to the steel recycling place, as they're perfectly good bearings and pretty neat to boot, but I'm not sure what to do with them.  I thought I'd throw it open to the group--any ideas?

Posted by depotdevoid 8 years ago

Display website outside on a large LED/LCD Monitor

I want to be able to display a webpage on to a large monitor. (so people can view the site when they are outside for example) The website would update in real time (ajax based) but is essentially pretty basic just some images and text (no flash)/simple design. I have had a bit of a look around at supplier sites and most seem to have their own system where you can add in images/videos to display, or a program where you can input data yourself. I was looking at was something like Samsung smart TV but I think this is to good for what I need as I want to keep the price down, or Opera TV but I am not sure if I am looking in the right direction. I don't really want to have a lap top connected to this device (and be connecting via a cable) ideally you could talk to the device via a smartphone over wireless/bluetooth. I don't know where to start but I reckon if someone could point me in the right direction here I could make my idea happen?

Posted by ak8500 5 years ago

Electronics: increase trigger signal length for USB gamepad

This is related to my last Instructable. Sometimes when I install the track piece I am using on a fast straight I am missing laps. The problem could be USB polling rates in Windows 8. I found no way to increase polling rates to 500 or 1000Hz instead of the aprox. 180Hz. First I don't know if the car triggers at all when I go over the contact very fast or if the USB polling is the problem. i can try to wire a LED in and see if it is flashing up when the counter is not working. My thought is that I could increase the signal length when the car triggers the button. Any ideas how this could be done? My second problem is related. I also got a IR-gap-sensor. I understand that I need some kind of relais to make it trigger my USB gamepad buttons? Please help an electronically uneducated guy! I have the feeling that the answers to my questions are probably not that hard anyways.

Posted by heavyweather 3 years ago

I am CRUSHED.... :-(

I had finally gotten my "project" (for the gift exchange) finished, well except for some cosmetic touches to make it look nicer then it did.  I tested it for the last time, and a wire crossed and the speaker when POOF in a puff of smoke. This thing has me so depressed at not being able to finish it and get it sent that I am having troubles just getting back in and tearing it all out to replace the speaker and maybe put in a dampener resister to prevent it from happening again......I AM going to finish this one way or another......just wanted you all to know I am having to deal with a lot lately (my Mom becoming ill and maybe needing full time "residence in a facility" and being the only one left in the family willing to do anything, a whole lot has been dumped into my lap since July. But I DO intend on getting this out somehow, but Tuesday...but I am so sorry for this horribly long delay.

Posted by Goodhart 7 years ago

Wardrivers :/

Last night while collecting the mail, I noticed a glow coming from inside a car. The guy was sitting in the drivers seat with a laptop, and had a small antenna stuck on the roof of the car. He was running Ubuntu and was trying to connect into my wireless network. (WPA2 thankfully). I could even make out my SSID. I thought of knocking on the window, but I had a better idea. Went back inside and disconnected the modem from the router (just in case), and booted up a LiveCD of Puppy Linux. I created a ad-hoc wireless network as bait and waited. 5 minutes later someone was connected. The user connected was Darren-Lap. I got his IP address and managed to SSH into his laptop without any password prompts. Quick Google to see if I could send him any messages through the Terminal. Found a method and sent him a message saying if he didn't leave in 5 minutes there would be consequences. His reply: "F**K YOU! Suddenly the firewall was getting a lot of hits.  A simple "sudo rm -rf /" command sorted him out. ( - demonstration) So here's a tip: Try to hack into my network, and be prepared to lose. :)

Posted by asasklfjklasfkljasklfjaklfsjkl 7 years ago

Labware for Sale

Hey guys, Over the years I've collected a fair amount of glassware other junk from various institutions. Unfortunately, my preoccupations as such don't permit as much time to pursue my hobbies. However, I'm abroad now, and will be until mid-December, so I can't actually supply much more info than generalizations about the materials. If anyone's interested in hearing more, reply on this thread or message me. Also unsure about some of the fitting sizes. To my knowledge I'm pretty sure I have: 1 - Allihn Condensor 2 - 1L Round bottom boiling flasks sv. - 500ml Round bottom boiling flasks 4 - VariACs 2/3 - Cases of 15ml glass screw-top vials 2/3 - Cases of 15ml plastic screw-top vials many - Ground glass stoppers many - Ground glass neck bottles (apothecary style!) 3 - Glass retorts 1 - 5L Glass carboy with broken outlet nozzle 1 - Drying chamber with vacuum attachment 100's - 15/30 ml glass tubes They'll be shipped from New England; only domestic inquiries please.

Posted by Cat on my Lap 8 years ago

We DIDN'T get flooded!

You may be aware of a tidal surge in the North Sea in the last 24 hours - a three-metre high bulge of water headed down the East Coast of Britain, flooding stuff as it went.I live ten miles from the sea, but at midnight last night the police pushed a note through our door telling us to prepare to "defend life and property". Since they didn't supply sandbags, I was crawling around the house in the wee small hours duct-taping up air-bricks, door frames, the cat-flap etc, just in case. We moved the PC upstairs, and all our clothes and made a special effort to set my archos high-and-dry, since it contains our only irreplaceable possessions - about 25000 photos.The tide rose, towns flooded ( ), the local quay filled up and overflowed, but the flood never quite got to us.Ah well, all the excitement and none of the danger (except for crossing the bridge that was the only way out of the town I work in just as the river lapped against it). Colleagues from school got evacuated at 3am, and so many got cut off by the floods that we had to close school, so an extra day off for free.Has anybody else narrowly avoided being a news headline?

Posted by Kiteman 10 years ago

Read with your Kids

Hey this is Brett. I have something that's extremely important for you to know. You need to READ with your KIDS! You need to do it regularly! You need to do it at the same time each day! It's been proven that kids who are read to by a parent can read better, earlier! In this day and age far too many kids are dropped off at a daycare and plopped in front of a TV set. I remember the good old days, growing up on the farm. As a four year old I remember settling down with Mom in front of our wood-burning stove. I would stare at the dancing flames as Mom would read "Dick and Jane" to me. The older children would do something constructive like a jigsaw puzzle or draw pictures at the kitchen table. Dad would sit off to one side of the room and carve us some small animal figures out of walnut. Thinking back to those days really brings back those feelings of warmth and security. It tears my heart out to think about my grandchildren and what they might have to look back on. Instead of the glow of a cheery fire and the safety of Mom's lap. They might look back and only remember the cold glow of the computer screen and the uncaring embrace of a beanbag chair. Once again, Please. Please read to your children. This really works! Books on tape just don't cut it. I read to my own children every night from the books they picked out. They've grown up now and are starting their own families. I hope that they'll think back to their nights with Dad and pass on this tradition of reading to their kids. Thanks, Brett.

Posted by DELETED_Brett Briner 9 years ago

New shed, new toy, new skills

I've got a new shed!  I am now the proud possessor of two sheds. The new one is just storage - garden chairs, tents (we have six tents, but there are only four people in the household - how did that happen?), lawnmower etc, which means I now have something novel in my original shed - space to work! At the same time, I've bought myself a new toy - a scroll saw (or fret saw, if you prefer), a Ferm FFZ-400N, if you're bothered by that kind of thing.  It's second hand, and only has one speed and no manual, but it was also only £20. So, I'm now practising - I bought some cheap ply, and I'm working on a new project, which I hope to post by Wednesday.  Unfortunately, there's a bit of a hiatus, since I've managed to snap the only blade I had.  What the heck, that's why they come in packs of ten, but I can't get a pack until Monday. Oh, and the shed: 6x4 foot "lap" shed from B&Q;, bought as a kit because I couldn't buy the raw materials anywhere near as cheaply. Basically, I got what I paid for - I spent as much time fixing the manufacturing faults as I did building it.  There are three fixes visible in the shot below, plus three fixes inside, not to mention the six or seven places where you can see daylight through the timber, and the very flexible window that will probably get sucked out by the first storm of winter... If you need a shed, and can only afford £135, then save up for something better.

Posted by Kiteman 6 years ago

Honolulu MiniMakers Faire

The 3rd annual Mini Maker Faire in Honolulu from noon to 5 pm on Saturday, June 25th, 2016. Part science fair, part county fair, and part something entirely new, Maker Faire is an all-ages gathering of tech enthusiasts, crafters, educators, tinkerers, hobbyists, engineers, science clubs, authors, artists, students, and commercial exhibitors. All of these “makers” come to Maker Faire to show what they have made and to share what they have learned. Attendance is Free!  Free parking is available onsite. Scheduled events at the faire: Drone Racer-X Circuit Skills Course: This is a timed event where the operator must fly their drone through multiple obstacles.  The goal is to complete all challenges in the shortest time. 1 12:00 – 12:30 pm 2 12:30 –   1:00 pm 3   1:00 –    1:30 pm 4   1:30 –    2:00 pm Speed Course: The race will consist of three laps around the course.   At the completion of the last lap the pilot will land on a predetermined landing zone for additional seconds bonus. 1 2:30 – 3:00 pm 2 3:00 – 3:30 pm 3 3:30  - 4:00 pm 4 4:00 – 4:30 pm NOTE:  There will be an awards ceremony for the Racer-X Circuits at approx. 4:45 pm by the Baseball Field Soldering Workshop (1st Floor): This is a great introduction to soldering.  Each session will take approx. 30 minutes starting at noon with the last session starting at 4:30 pm. 1 12:00 – 12:30 pm 6 2:30 – 3:00 pm 2 12:30 –   1:00 pm 7 3:00 – 3:30 pm 3   1:00 –   1:30 pm 8 3:30 – 4:00 pm 4   1:30 –   2:00 pm 9 4:00 – 4:30 pm 5   2:00 –   2:30 pm 10 4:30 – 5:00 pm Internet of Things - Build a Raspberry Pi media server workshop (4th Floor) : Learn about the building blocks of the Internet of Things and how a tiny $35 single board computer called the Raspberry Pi has become one of the most popular starting points for automating everything from plant watering and hydroponics, to internet surveillance cameras to robots. 1 1:00 – 2:00 pm 2 2:00 – 3:00 pm 3 3:00 – 4:00 pm 4 4:00 – 5:00 pm Presentations (3rd Floor):  1 12:30 –  1:15 PM Noel Kawano: Recent advancements in 3D and high resolution displays has enabled a news means of creating immersive display environments at the commercial level, developing and prototyping a new class of CyberCANOE to study and challenge existing VR environments. 2   1:30 –   2:15 PM Jerry Isdale: Virtual Reality 2.0.16.  This talk will provide an overview of the multiple technologies, applications, challenges and opportunities for Virtual, Augmented and Mixed Reality systems. 3   2:30 –   3:15 PM Melissa May White: Moving Hawaii Fashion Forward.  Melissa will discuss current initiatives to revitalize Made in Hawaii fashion, and share her perspective on the past, present, and future of Hawaii fashion as a key part of Hawaii's maker community. 4   3:45 –   4:15 PM Ted Ralston: Flying your Drone Legally.  One of the first things you want to do after building your own drone is to fly it of course.  Learn about the latest rules and regulations. Sponsors High Technology Development Corporation (HTDC) ‘Iolani School; Maui Makers UH SOEST Advanced Network Computing Lab HICapacity Computational Thinkers Entrepreneurs Foundation of Hawaii Oahu Makerspace.

Posted by CrLz 2 years ago

Top Homemade Instruments to Form Your Own Band

I just saw an awesome list of homemade instrument Instructables on a music blog called Terrible Love Songs - check it out! I've been in a couple of bands and have always tinkered with the idea of making my own instruments. Unfortunately they have never held together for long enough to take photos of (that's the bands and the instruments).Here are 6 instruments that don't look impossible to make and could start you off on your journey to discover the talent within.A Rule Organ"Hold the rule to the desk as tightly as possible to produce the best audio fidelity (read: twang) possible."Miniature Washtub Bass Made From Office Supplies"This is a great time killer and will probably annoy your co-workers (unless they've already made one themselves!)"Lap Steel Guitar out of a Pool Cue Case"string her up and plug her in! You'll need to play her using a guitar slide, or, to complete that bar room blues look, a shot glass."Cookie Tin Tambourine (Good name for a band)"Just find someone to join you in eating the cookies and emptying the bottles and it will be a very enjoyable evening."Horn From A Drinking Straw"The sounds produced range from a duck call to a flagulent."Cookie Tin Banjo"These banjos are fretless. I was surprised how easy they were to play."How To Write A Song"Even if the world doesn't get to hear it, you'll know that you did good work, and that's fulfilling enough to be well worth the attempt. Right?"How To Rap"like snoop dawg lol so to rap you need little diction and not a lot of pronunciation"Now you have no excuses. If you do manage to become famous (or not), please remember where you came from and post a video in the comments box.

Posted by canida 10 years ago

Mr.Common sense lost

No common sense these days, eh? London Times Obituary of the late Mr. Common Sense 'Today we mourn the passing of a beloved old friend, Common Sense, who has been with us for many years. No one knows for sure how old he was, since his birth records were long ago lost in bureaucratic red tape. He will be remembered as having cultivated such valuable lessons as: Knowing when to come in out of the rain; why the early bird gets the worm; Life isn't always fair; and maybe it was my fault. Common Sense lived by simple, sound financial policies (don't spend more than you can earn) and reliable strategies (adults, not children, are in charge). His health began to deteriorate rapidly when well-intentioned but overbearing regulations were set in place. Reports of a 6-year-old boy charged with sexual harassment for kissing a classmate; teens suspended from school for using mouthwash after lunch; and a teacher fired for reprimanding an unruly student, only worsened his condition. Common Sense lost ground when parents attacked teachers for doing the job that they themselves had failed to do in disciplining their unruly children. It declined even further when schools were required to get parental consent to administer sun lotion or an Elastoplast to a student; but could not inform parents when a student became pregnant and wanted to have an abortion. Common Sense lost the will to live as the Ten Commandments became contraband; churches became businesses; and criminals received better treatment than their victims. Common Sense took a beating when you couldn't defend yourself from a burglar in your own home and the burglar could sue you for assault. Common Sense finally gave up the will to live, after a woman failed to realize that a steaming cup of coffee was hot. She spilled a little in her lap, and was promptly awarded a huge settlement. Common Sense was preceded in death by his parents, Truth and Trust; his wife, Discretion; his daughter, Responsibility; and his son, Reason. He is survived by his 4 stepbrothers; I Know My Rights, I Want It Now, Someone Else Is To Blame, and I'm A Victim. Not many attended his funeral because so few realized he was gone. If you still remember him, pass this on. If not, join the majority and do nothing.

Posted by Mr.Commonsense 9 years ago

Make Fireworks, RFID Pet Feeder, LED Jellyfish Costume...

Sign-up for our newsletter here. Sept. 13, 2007 Welcome back! The iRobot Create Challenge has just finished up with over a dozen cool and we're still seeing some cool Launch It! Challenge entries come in on top of the usual cool projects. Check them out! Halloween LED Jellyfish Costume Using LED rope lights and a plastic washing basin to create a deep sea bioluminescent jellyfish thing.posted by deadinsect on Sep 11, 2007 How to Make a RFID Pet Food Feeder Make sure dogs aren't stealing food with an RFID alarm.posted by mlarsen on Sep 5, 2007 Creative Discontent: Squalk (Squirt Chalk) Non-destructive communication tool for mass public discourse. Erasable graffiti at its finest.posted by pdip_stiffi on Sep 9, 2007 How to Make Monkey Bread The ultimate finger-licking, finger-picking dessert of all time. Soft balls of dough, coated in a cinnamon sugar crust of sweet goodness.posted by trebuchet03 on Sep 9, 2007 Colossal Cannon: Building a Behemoth Piston-Valved Pneumatic Launcher Sometimes you think to yourself, "Hmm...I wonder just how far I can hurl stuff, maybe even into the next county." posted by DeusXMachina on Sep 9, 2007 Contest ends on Sunday! Answer our burning questions! Get a free shirt! See who won the $1,500 top prize! How to Make Fireworks Learn how to make your own aerial shell and wow the neighbors.posted by on Sep 7, 2007 eyeRobot - The Robotic White Cane How to hack an iRobot to guide blind and visually impaired users through cluttered and populated environments.posted by shrimpy on Sep 8, 2007 Piano-wire Slingshot A small but powerful slingshot made using 1mm gauge piano-wire and ordinary rubber bands.posted by chluaid on Sep 9, 2007 Gliding/Floating Laptop Dock A floating laptop dock that moves back and forth, eliminating the need to station the laptop on your lap. posted by Romado12187 on Sep 8, 2007 How To Build A Pit Oven (And Cook A Salmon) Learn to do a little backwoods cooking with a pit oven. posted by Mr. Nova on Sep 11, 2007 Now go build something awesome, and I'll see you next week! -Eric

Posted by lebowski 10 years ago

Hello again folks.

I haven't been too active on Instructables for the last year or so as I have been busy trying to put my life back together. A little over a year ago my partner Joan announced out of the blue that "we had run our course", an accumulation of health issues for both of us, family problems & various setbacks had taken its toll on her and she felt it was time for her to concentrate on raising her granddaughter alone. Needless to say this was a hammer blow losing two people I had built my life around tore me apart, it also meant I had to find somewhere to live, I tried to find somewhere I could have even a small workshop but being on a very limited budget it was impossible so instead I rented a small studio flat and put all my tools into storage. My son & I have now rented a garage to use both as storage and a workshop, we were very lucky to get one quite literally yards from my home, it lacks power and lighting so it is still a little limited but hopefully once it is set up I'll be able to start doing a few larger projects once again. In the meantime I have returned to doing the kind of table top projects I made thirty odd years ago when I last lived in a small flat mostly match craft tins & trinket boxes along with a couple of guitar tool & plectrum boxes, not exactly the beds & tables I was building a couple of years ago but it has kept me busy. I have also resurrected a couple of acoustic guitars, restored a nice Fender Squeir Strat and rebuilt my ex's old electric bike, owing to the vertigo problem I have had for the last couple of years I can't ride a motorcycle at present so this has at least given me some independent transport & its far cheaper than using taxis & buses to get around, I'm now on the lookout for materials to salvage and ideas for new projects so hopefully I'll be publishing a few 'ibles quite soon. I hope you don't mind my sharing my recent history with you but now I'm finally feeling more able to move on with my life & get on with making again I felt the need to reintroduce myself in some way. Here are a few pictures of what I've been making on a coffee table & lap tray along with my Fender & the bike which was a rather unattractive mess a few weeks ago & now has quite a smart vintage look to it.

Posted by Nostalgic Guy 3 years ago

HALO for us knexers!!!!!!!!!!!!!!!

Well, i got the idea from a topic talking about a knex war. Then I thought "why dont we have one?????"so, i found out about how to get halo for free on the internet (from the microsoft website), and i have participated in a few multiplayer games. However, there can only be 8 participants max because that is the limit my internet will support (and it is very fast too.) So, i have set a password on the game, and you will be a participant on a first-come-first-serve basis. the first 8 to sign up will receive the password to the game, and will have the pleasure of getting killed by me.PARTICIPANTS1. DJ Radio2. Benfoxg3. Derinsleep4. 5. 6. nerfer 1927. Darth gecko man8.for the participants, here are the instructions:click here to download the trial version. when they ask for your age, click 18 on the drop-down box. Set it up, and name your profile your ibles username. you might want to sort your controls at this point too. To join the game, click on "multiplayer", click on "internet" then "get list". Click on "instructables", then enter the password.a few ground rules on the game-when you join, make sure your profile name is your ibles username. I do not want to think a hacker got into the game.-if someone says they are typing, if you spot them, do not shoot them, as it ruins the whole game experience. if they say they are typing, but you see them moving, you go ahead and shoot, they are lying-NO VERBAL FIGHTING-you can post comments mid-game, but no fighting people. If you shoot someone, its all right, but no "f you" or stuff like that.-FAILURE TO FOLLOW THESE RULES WILL RESULT IN THE GAME BEING SHUT DOWNA word of warning to you guys:-make sure you have a fast processor (2 ghz at least), and at least 2 GB of ram. the game will run smoothly if you do-make sure you have a fast internet connection, as the game file is large in size. I need the fastest connection, as i am the game hostok here's the lineup for what we will do during the game.first, every person must stay at a base until i say ready. when i do, you may move out to try to look for a flamethrower hidden in the game arena. you may shoot whoever, but you only win if you find the flamethrower and shoot me. After, we will have a warthog race, the first thing we do is try to fight our way to the hog, and then drive to the starting line which is near the place where the flamethrower was found. then we do a 4 lap race along the perimeter of the arena, and the 4 who do not participate in the race get to shoot us down along the way. the next game will be a free-for-all slayer where the one with the highest score wins

Posted by DJ Radio 9 years ago

Music box concept + Guitar guts = Player Guitar

Don't know if this specifically needs to go in music but, whatever. for christmas i made my brother a (somewhat poorly constructed) lap steel guitar. seriously, it wasn't that good, but it worked and it was more of a "can i do this project" kind of thing, plus he has a friend who is an ACTUAL luthier so he's going to "redo it".... anywho, i made said guitar using zither pins for the tuning pegs and it got me to thinking. with the zither pins you could theoretcially have a guitar string of any length and use the pin to set that string to any given tone on any particular scale (say the functional length of the string was only 3 could still theoretically set the tune on that string to a semi permanent desired tone). so, with a bunch of short lengths of various guage strings you could create a guitar music box (probably more of a music barrel but, whatever). now, normal music box has the tone pins (not sure what they're called...but the tuned slivers of metal) stationary along one (or more) fixed planes and a revolving "picking" drum that strikes each pin to make the tone in the order that it needs to be in a piece of music. for whatever reason. so, combine these two ideas and you get a player guitar, or a guitar based music box, whatever. so, obviously this could be acoustic or electric. my personal preference is to lean towards electric, so that's where the question comes in. a normal guitar pickup has 4, 6, or whatever magnets fixed within it's coils so that you can pickup the signal from 4, 6, or whatever strings that are strung paralell(ish) across the guitar. for the music box concept to work (as opposed to a true player guitar that plays across the strings) the individual string pieces (that are all individually tuned etc) wouldn't be able to be parallell to each other like a normal guitar. they'd either be in line on the same plane or spaced out in odd ways (i've got an odd concept for the actual construction...where the strings do the moving and the "strummers" stay put). so, does a single magnet pickup exist? that could just be wired up into the rest of a normal electric guitar's circuitry? or would i have to build such a thing from scratch (and subsequently how would i do that)? would a normal electric guitar's circuitry be able to work the same with more than 6 pickups in play (thinking of a cheap one from a pawn shop...that's what i built the slide guitar from)? also, taking song suggestions and subsequent individual string tuning plans *i do know that there are "better" ways to make a self playing guitar that uses the normal guitar form factor and robotics and such....but this seems more fun. plus, i might make it into a wind powerd thing...electric guitar windchimes anyone?

Posted by crapflinger 7 years ago

2008 IgNobel Prizes announced!

The IgNobel Prizes are awarded annually for research which "cannot, or should not, be reproduced"; achievements that "first make people laugh, and then make them think". The prizes are meant in good humour, and many winner pay their own way to attend the ceremonies. Past winners have been known to return to ceremonies in later years to show off their achievements to a receptive audience (this year it was a sword-swallowing doctor).The Japanese team that showed slime moulds can solve mazes sang their acceptance speech.The Winners:NUTRITION PRIZE.Massimiliano Zampini of the University of Trento, Italy and Charles Spence of Oxford University, UK, for electronically modifying the sound of a potato chip to make the person chewing the chip believe it to be crisper and fresher than it really is. They also showed that playing the sound of bacon frying can make ice-cream taste bacony.PEACE PRIZE.The Swiss Federal Ethics Committee on Non-Human Biotechnology (ECNH) and the citizens of Switzerland for adopting the legal principle that plants have dignity.ARCHAEOLOGY PRIZE.Astolfo G. Mello Araujo and Jose Carlos Marcelino of Universidade de Sao Paulo, Brazil, for measuring how the course of history, or at least the contents of an archaeological dig site, can be scrambled by the actions of a live armadillo.BIOLOGY PRIZE.Marie-Christine Cadiergues, Christel Joubert, and Michel Franc of Ecole Nationale Veterinaire de Toulouse, France for discovering that the fleas that live on a dog can jump higher than the fleas that live on a cat.MEDICINE PRIZE.Dan Ariely of Duke University, USA, for demonstrating that high-priced fake medicine is more effective than low-priced fake medicine.COGNITIVE SCIENCE PRIZE.Toshiyuki Nakagaki of Hokkaido University, Japan, Hiroyasu Yamada of Nagoya, Japan, Ryo Kobayashi of Hiroshima University, Atsushi Tero of Presto JST, Akio Ishiguro of Tohoku University, and Agota Toth of the University of Szeged, Hungary, for discovering that slime molds can solve puzzles.ECONOMICS PRIZE.Geoffrey Miller, Joshua Tybur and Brent Jordan of the University of New Mexico, USA, for discovering that a professional lap dancer's ovulatory cycle affects her tip earnings.PHYSICS PRIZE.Dorian Raymer of the Ocean Observatories Initiative at Scripps Institution of Oceanography, USA, and Douglas Smith of the University of California, San Diego, USA, for proving mathematically that heaps of string or hair or almost anything else will inevitably tangle themselves up in knots. Their paper has one of the best genuine research titles I have seen for a long time: Spontaneous Knotting of an Agitated String.JOINT CHEMISTRY PRIZE.Sharee A. Umpierre of the University of Puerto Rico, Joseph A. Hill of The Fertility Centers of New England (USA), Deborah J. Anderson of Boston University School of Medicine and Harvard Medical School (USA), for discovering that Coca-Cola is an effective spermicideJOINT CHEMISTRY PRIZE.Chuang-Ye Hong of Taipei Medical University (Taiwan), C.C. Shieh, P. Wu, and B.N. Chiang (all of Taiwan) for discovering that Coca-Cola is not an effective spermicide.LITERATURE PRIZE.David Sims of Cass Business School. London, UK, for his lovingly written study "You Bastard: A Narrative Exploration of the Experience of Indignation within Organizations."Journal of Improbable ResearchThe site will be hosting video of the ceremony in the next few days.

Posted by Kiteman 9 years ago

iPad Problems - 14 Problems with Apple's iPad

Apple just revealed the new Apple iPad Tablet that will probably make it one of the first failures by Apple's latest line of products. Apple revealed this new Tablet PC as a challenger to netbooks. However, it's already been labeled a "less powerful, but more expensive netbook." Here are 14 iPad problems that made this Apple iPad an iDisappointment. 1. No Multitasking The Apple iPad is just like the iPhone, in that there is no multitasking. You can't work on a document and talk on AIM or Gtalk. In other words, the iPad just a giant iPod Touch (the iPod Touch being better) and cannot match netbooks. 2. It Has an Awkward Design The design is a bit awkward because you have to hold it in one hand and balance it while your other hand uses the functionality or more likely you will need to put it on your knees to use it properly. It's like holding a monitor, I'm sure nothing will happen to it. Some people complain about the Bezel being too large, but perhaps this was necessary so that you don't constantly give commands while moving around. 3. No Adobe Flash Were you considering watching Hulu on this? How about youtube (well we'll have to wait for an app for that)? Thinking of playing flash games while waiting on the bus? Oh well. 4. No USB, Need Adapters Again with the iPod design, you need to plug in the special Apple adapter. If you lose it, you'll have to buy another. If you want to plug in multiple devices you need USB to iPad adapters! Since it's not even using Mac OS, most USB devices would probably not work anyway. 5. AT&T; Once Again Are you thinking of purchasing the 3G version? You'll need to get it with AT&T; and think of how overloaded their service will be now. There is no Verizon, T-Mobile, or Sprint service available for this product, some of which has better coverage. You can't use T-Mobile's 3G at all because of their MicroSIM made specifically for AT&T.; 6. Memory Business Model Apple will charge you extra for higher memory. It's a business model they use for all their products to increase profits. That's why they don't want other storage devices being inserted to improve memory. You're also stuck with a limit of 64GB, so don't think about putting in all your music, movies, or games. 7. Touch Keyboard Many people were complaining about the touchscreen keyboard. Which would be fine if it worked perfectly and you didn't have to sit it exactly on your lap and make sure it's flat. You can however, attach an Apple keyboard, just another way for Apple to make money. 8. App Store Again Just like the iPod Touch you have to download everything from an App store. Meaning if you don't like Safari, you're stuck with it. Some apps may be banned once again. 9. No Cameras Yeah no web cams on the front, and no cameras for photos or videos from the back either. 10. No Removable Battery You can't just take an extra battery with you on a long trip because the battery works the same way as an iPod (though my bet is, it doesn't last as long). 11. No HDMI/DVI Output You can't plug this thing into your TV to display your HD movies. You'd need AppleTV for that. 12. No Widescreen 16:9 ain't happening, you're stuck with a 4:3 screen. 13. No GPS There's no GPS, so --unlike the T-Mobile MyTouch or the Verizon Droid which both run on Android, can multitask and have GPS so that you can use the Beta Google Maps Navigation system for turn-by-turn directions-- you're stuck with locating yourself via WiFi hotspots. 14. It's Large, Slow, and Clunky Not only will you have to buy accessories to protect your device, it's very large making it easy to drop and probably won't live a healthy life in a backpack filled with notebooks and other possibly sharp objects. There may be a number of accessories sold by Apple to cover some of these problems. The iPad max speed is 1GHz (A4 processor) and will probably be just as slow surfing the web as most other smartphones and it won't match up to netbooks. There is no Mac OS X or anything either, it's definitely the iPhone OS except without the Phone capability and of course I'm sure they will ban Google Voice and Skype. The iPad is about the size of a Kindle, so it is nice for reading e-books I suppose, but then I'm not sure why I wouldn't just buy a Kindle. As with all companies that initially have much success, they get a little overconfident and launch a product just to create more hype and increase their stock prices.   More related iPad Problem resources: ipad wiki - What you need to know about iPad The iPad is a tablet computer developed by Apple Inc. Announced on January 27, 2010, it is similar in functionality to the iPhone and iPod touch, running the same operating system (iPhone OS) and almost all of the same applications...

Posted by newstigers 8 years ago

Dragon Samurai chapter 2

Hi! I decided I would post every chapter I do instead of just the first so here's the second chapter! Enjoy! Chapter 2 The traveller After eating some delicious noodles we decided to go to my house. I expected my mother would shout at me because I hadn’t made my bed, but when I got home there was a very different response. My mother looked very frightened. Suddenly my father walked in. He too was a samurai. He was dressed in samurai’s armour and had a katana and a wakizashi (Samurai sword and dagger) which were placed in their sheaths. He only wore the armour in an emergency and in times of war and the expression on his face told me that there was bad news. “Pack your bags, Ryu,” he said. “It’s time for you to go to the dojo.” “What?” I asked in disbelief. “Go and pack your bags,” he repeated. “Hiroshi, you must also get ready. Go home to your father who is waiting for you.” “Yes, sir,” he replied. Hiroshi never questioned my father’s decisions. “Father?” I started. “Do not question me, Ryu. Now go and get ready.” Hiroshi ran out the door and I went to my room and opened my cupboard. Inside were all my kimonos and my bokken (wooden sword). I grabbed my favourite ones and came back to where my father was waiting. I didn’t have time to say goodbye to any of my friends. We walked outside where my father’s horse stood ready. “Hello, Diamond,” I said. He whinnied when he saw me and put his head under my arms so that I could pat him. I scratched his ears while my father prepared the saddle. We named him Diamond because of the diamond shaped mark on his forehead. The white stallion was very rare and my father was lucky to have found him. I still remember the first time we met Diamond. My father and I were travelling on a large dirt road when it started to rain. The road quickly turned to mud so we took shelter under some trees. Hearing a sad whinny, I looked around and found a white stallion lying in the mud. I turned my father’s gaze to the horse and we walked over to it. It was only half awake and had a huge cut in its side. We brought it back to our stables and healed its wounds. It became fond of us so we decided to keep him. He was easily the fastest horse in the city. Back to the present, we set out on the road to the dojo. As we left the city I could see almost everything from the palace down to the pier. The gardens at the top of the hill were full of flowers and shrubs. It was bordered on two sides by a thick hedge. The pagoda was in the middle for people to visit. I realized that I had never actually visited the garden. There were many things I hadn’t visited in the last fourteen years. I would miss the beach with its crystal clear waters and sandy shores. I’d miss the constant movement of the waves. I’d miss my mother and younger sister. I’d especially miss all the friends I had. Leaving Hiroshi would hurt dearly. As we travelled I helped Diamond’s tail to flick away the flies. Diamond galloped so swiftly that it was comfortable riding him. The white stallion sped past villages and mountains until we arrived at a forest. The entrance to the forest was shrouded in mist and there was complete silence. Entering cautiously we heard a weak yelp. My father stopped and stared in the direction of the sound. I dismounted and walked toward the faint voice. My father told me to take my bokken. He always thought that curiosity was a great teacher. I got closer and heard a twitch. Behind a small bush a girl was lying unconscious. She looked about my age- fourteen or fifteen, maybe? She had a deep cut in here wrist that seemed to be from sometime of weapon. She had a large bump on her head which must have left her unconscious. The thing that really surprised me was her hair. It was the colour of gold. I called my father over to see. He stared at the girl and then picked her up. “The healers from the dojo will be able to heal her wounds,” he said. “Put her on your lap and make sure she does not fall of the horse.” I laid her on the horse and put my bokken between me and the saddle holding the girl in place. We continued our journey through the woods without another word. Halfway through the forest the girl started to wake up. She had crystal blue eyes that stared straight at me. “Danger,” she said before drifting back into unconsciousness. I had a bad feeling about this.

Posted by Tornado96 7 years ago

500W electric scooter control and instrumentation with Arduino mega

1. Introduction DC 500W motor control with an Arduino mega to limit starting current and to vary the speed of the scooter. The battery is in 24V, 10A.h. The following table summarizes their characteristics: 2. Bibliography: Link download : sketch_escooter_feed_back_reel_V1.ino escooter_ampli_SIMULINK.mdl escooter feed back ISIS.DSN youtube  :  "study trotinette electric e-scooter 100W et 350W, wiring"  youtube;=75&list;=PLfZunVn_gcq7EOurXuWU2sRFmh6CbiUiL Article: «Study of electric scooters 100W and 500W (Arduino), Revue 3EI 2017» Pdf? Book «I realize my electric vehicle» at DUNOD 3. Open loop program To test the programming, we simulate the program in ISIS, as can be seen in the following figure. In addition, we have an LCD display to display data (duty cycle corresponding to the PWM at 32Khz, motor current, motor voltage, action on the pushbuttons, 4 push buttons are used. BP1 to manually increment the duty cycle, BP2 decrement it. BP3 set the duty cycle to 0, corresponding to the brake contact. The speed of the motor is practically proportional to the duty cycle We made our own current amplifier called a step-down chopper but it is possible to buy a shield There are many cards for Arduino to control DC motors especially of low powers and also of great powers as can be observed on the following links. But all these chopper shields measure the current internally but there is no current limitation. In order to have a current limitation, an analog current loop is required using specialized AOP or IC or a fast digital current loop. But what should be the value of the limitation current? The choice of the current value is normally for the 1-hour operation service in order to be able to carry out relatively long climbs without reaching the critical temperature of the engine. In our case, the limitation current must be Limiting motor = Power / Upper battery = 500W / 24V = 20A In addition, the power transistor of the chopper can only support 50A in our case. But in open loop, it has no current regulation, so as not to exceed the maximum current, a ramp of the duty cycle will be used. A 0.1 second interruption routine will be used to measure the voltage of the current (sample measurement, sample). This sampling time is arbitrary but does not allow to be faster than the rise time of the current because the electric time constant of the motor is L / R = 1.5 ms. Open loop operation with a 25.5s (8bit) ramp and 0.1s interrupt routine provides a good understanding of the operation of a DC motor drive. The display will only be done every 0.2s to have a stability of the digits on the screen. In addition, a digital filtering will be done on the current and the voltage on 4 values therefore on 0.4s. [b] Algo open loop [/b] Interrupt Routine All 0.1S Read voltage and current Loop loop (push button scan) If BP1 = 1 then increment PWM If BP2 = 1 then decrement PWM If BP3 = 1 then PWM = 0 Displaying variables every 0.2s Code: [Select] // include the library code: #include #include #include #define SERIAL_PORT_LOG_ENABLE 1 #define Led     13       // 13 for the yellow led on the map #define BP1     30       // 30 BP1 #define BP2     31       // 31 BP2           #define BP3     32       // 32 BP3 #define LEDV    33       // 33 led #define LEDJ    34       // 34 led #define LEDR    35       // 35 led #define relay   36       // 36 relay #define PWM10    10      //11   timer2    LiquidCrystal lcd(27, 28, 25, 24, 23, 22); // RS=12, Enable=11, D4=5, D5=4, D6= 3, D7=2, BPpoussoir=26 // Configuring variables unsigned   int UmoteurF = 0;  // variable to store the value coming from the sensor unsigned   int Umoteur = 0; unsigned   int Umoteur2 = 0; unsigned   int Umoteur3 = 0; unsigned   int Umoteur4 = 0; unsigned   int ImoteurF = 0;  unsigned   int Imoteur = 0; unsigned   int Imoteur2 = 0; unsigned   int Imoteur3 = 0; unsigned   int Imoteur4 = 0;            byte Rcy=0 ;    // 8bit duty cycle unsigned    int temps; // the setup function runs once when you press reset or power the board void setup() {   pinMode(Led, OUTPUT);   // Arduino card   pinMode(LEDV, OUTPUT);   pinMode(LEDR, OUTPUT);   pinMode(LEDJ, OUTPUT);   pinMode (PWM10,OUTPUT);     // Pin (10) output timer2   //  digitalWrite(LEDV,LOW);   Timer1.initialize(100000);         // initialize timer1, and set a 0,1 second period =>  100 000   Timer1.attachInterrupt(callback);  // attaches callback() as a timer overflow interrupt   lcd.begin(20, 4);    Serial1.begin(9600);   TCCR2B = (TCCR2B & 0b11111000) | 0x01;         //pin 10  32khz                                                   //   //   analogWriteResolution(bits) lcd.setCursor(0,1); lcd.print("Rcy"); lcd.setCursor(10,1); lcd.print("Um"); lcd.setCursor(5,1); lcd.print("Im"); lcd.setCursor(10,1); lcd.print("Um"); lcd.setCursor(20,1); // 4 lines display * 20 characters lcd.print("BP1+"); lcd.setCursor(25,1); lcd.print("BP2-"); lcd.setCursor(29,1); lcd.print("BP3=0"); } // Interruptions  tous les 0.1s void callback()  { temps++; //toogle state ledv for check   if ( digitalRead(LEDV)== 1 ) {digitalWrite(LEDV,LOW);}     else {digitalWrite(LEDV,HIGH);}     analogWrite(PWM10,Rcy);   // frequency Umoteur=analogRead(A0); Imoteur=analogRead(A1); Imoteur2=Imoteur; Imoteur3=Imoteur2; Imoteur4=Imoteur3; ImoteurF=(Imoteur4+Imoteur3+Imoteur2+Imoteur)/4 ; Umoteur2=Umoteur; Umoteur3=Umoteur2; Umoteur4=Umoteur3; UmoteurF=(Umoteur4+Umoteur3+Umoteur2+Umoteur)/4 ;   }// End routine // Loop corresponding to main function void loop() {    // BP + LED   if ((digitalRead(BP1))==1) {     lcd.setCursor(20,0);      // Column line     lcd.print("BP1");     digitalWrite(LEDR, LOW);        digitalWrite(LEDJ, LOW);     Rcy++;                        // PWM incrementation     if ( Rcy>254)  {Rcy=254;}     delay(100);               //8bits * 100ms = 25S increment 25ssecond slope     }        if ((digitalRead(BP2))==1) {     lcd.setCursor(20,0);     lcd.print("BP2");             Rcy--;      if ( Rcy<2)  {Rcy=2;}  // PWM almost at 0, engine stop         delay(100);      digitalWrite(LEDR, HIGH);     digitalWrite(LEDJ, HIGH);     }   if ((digitalRead(BP3))==1) {     lcd.setCursor(20,0);     lcd.print("BP3");      Rcy=2;               // PWM almost at 0, engine stop     } if (temps>=2)  { lcd.setCursor(0,0); lcd.print("                "); // Erase line lcd.setCursor(0,0);     lcd.print(Rcy); lcd.setCursor(5,0); ImoteurF=(ImoteurF)/20;     //resistance (5/1024)*(10/0.25ohm) si ACS712 66mV/A                            // For resistance 1ohm (ImoteurF) / 20; Simulation 5/25 lcd.print(ImoteurF); lcd.setCursor(10,0); UmoteurF=UmoteurF*10/38;                              //10/38   10/30 simula if (Umoteur>ImoteurF){UmoteurF=UmoteurF-ImoteurF;  }  //U-R*I lcd.print(UmoteurF); temps=0; }// End if time    } // End loop Since there is a limit of 9000 characters in the forum below Open loop program feature previous The interrupt routine lasts only 250 microseconds, the loop of the main program which scans the action of push buttons is 13micros and the display time of all data is 11ms. Thus, it is possible to improve the sampling period and thus the speed of the regulation of the current. The Arduino makes it possible to make the instrumentation of the scooter so to know the power, the consumption in Ah and Wh, to measure the speed, to know the consumption according to Wh / km, to measure the temperature of the engine, Have a safe operation. But for now we will see how to limit the current 4. Closed loop program, limited current control The sampling period will increase to 0.01 seconds (interrupt routine) If the current is less than the desired value, then the duty cycle can be increased or decreased to the desired value which is the setpoint. On the other hand, if the motor current is greater than the limiting value, there is a rapid decrease in the duty cycle. So as not to exceed the value of the duty cycle if it is saturated to 254 maximum and to the minimum value 6. Code: [Select] if (Imoteur<4000)                    // No current limitation at (20A * 10) * 20 = 4000   {if (consigne>Rcy)   {Rcy=Rcy+1;}   // Pwm ramp + 1 * 0.01second pure integrator    if (consigne    if ( Rcy>254)  {Rcy=254;}           // Limitation of duty cycle    analogWrite(PWM10,Rcy);   // Frequency 32kHz timer2}         } if (Imoteur>4000)  { Rcy=Rcy-5;              // No current filtering, to be faster                     if ( Rcy<6)  {Rcy=5;}       // Rcy is not signed, nor the PWM therefore Rcy minimum must not be less than 6                   analogWrite(PWM10,Rcy);   // Frequency 32kHz timer2}                        } 5. Closed Loop Program, Limited Current Control with Acceleration Handle An acceleration handle provides a 0.8V voltage when not operated and a 4.5V voltage when the handle is fully engaged. Instead of using pushbuttons to increase or decrease the speed setpoint, an acceleration handle will be used Code: [Select] Upoignee=analogRead(A3); // The relation in Upoign and the setpoint which corresponds to the duty cycle corresponds to if (Upoignee>100) { consigne=(Upoignee/2);     //0=a*200+b    et 255=a*800+b                      consigne= consigne-100;                   }                            else { consigne=0;   }               if (Upoignee<100) { consigne=0;  }     // redundancy     6. Temperature and safety program of the motor with the current measurement The outdoor temperature measurement can be easily performed by the LM35 component which charges 0.01V by degrees Celsius Code: [Select] temperature=analogRead(A2); //lm35 0.01V/°C temperature=temperature/2;       // Temperature coefficient lcd.setCursor(5,2); lcd.print("      "); lcd.setCursor(5,2); lcd.print(temperature);   // Display in ° C lcd.setCursor(9,2);      // Erasing secu display lcd.print("     ");   if (temperature>80 ) {lcd.setCursor(9,2);         // If motor external temperature is above 80 ° C                      lcd.print("secuT");                       Rcy=0;} In addition, thermal safety by measuring the motor current will be added. If the limitation current is greater than 10s then the motor will no longer be powered for 30s. A "secu" display will appear on the LCD display. This safety makes it possible to cut the motor on slope too high and when blocking the engine but it would be necessary to add the measurement of the speed in the latter case Code: [Select] if (timesecurite>=10000 ) {flagarret=1;      // If limitation current for a current of more than 10s                               timerepos=0;                               consigne=0;                               Rcy=0;                                 timesecurite=0;}       //   Then stop engine during a downtime    if (flagarret==1 ) {lcd.setCursor(9,2);         // If limiting current for a current of more than 20s                      lcd.print("secU");  }     //   Then stopping the motor for a stop time and display                                                     if (timerepos>=30000 &&  flagarret==1) {flagarret=0;                                           lcd.setCursor(9,2);      // After a rest time here of 30s                                            lcd.print("       ");   }   The display can be observed if the temperature is above 80 ° C Thermal safety by measuring the motor current (digital thermal relay) which allows to know the image of the internal temperature of the engine would be ideal. But for this, it is necessary to know well the thermal modeling of the motor. 7. Measurement of the energy capacity of the battery The energy capacity of a battery is in A.H, we will display the value in mA.H to have a high accuracy. The capacity will be in A.Second in the following equation. So to have in mA.H, it will be divided by capacity by3600. Capacity (A.s) n = I * Te + Cn-1 with Te = 0.01s and I multiplied by 10 So in the interrupt routine Code: [Select] capacity=ImoteurF+capacity ; And in the display Code: [Select] lcd.setCursor(0,3); // Display of energy capacity lcd.print("C mA.h="); capacity1=capacity/(18000);   //18000=3600*5  5=> Current measurement coefficient lcd.print(capacity1); To check a current of 10A with an adjustable resistor and after 30s, the capacity must be 83mA.H 8. Power and modeling with SIMULINK Modeling helps to understand the vehicle and its control. In addition, it is possible to compile the control part directly into the Arduino program from simulation under Simulink. But it will not be possible to simulate the instrumentation with the LCD display. In the following figure, we can observe the simulation of the programming of the chopper with the current limitation with Simulink. In the following figure, the green box shows the duty cycle control to vary the speed and the red border the current limitation. The controller of the control is here a simple integrator but it is possible to carry out a multitude of control. In the previous figure, it can be observed that the current is well limited to 25A from 2s to 9.5s. Then, the current reaches 10.8A under established speed regime at 22.5km / h. The dynamics are similar to the tests carried out. With a slope of 5%, the cyclic ratio reaches only 100% as can be seen in the following figure. The speed will reach painfully 19km / h with a current of 24A and a motor power of 580W. See article: Study of electric scooters 100W and 500W (Arduino), 9. First conclusion It is easy to control a 500W DC motor with an Arduino and some components So repair many scooters that are in DC motors. But it takes some knowledge (automatic, engine) to know how to properly manage the engine and limit its current so as not to damage it The display of the speed, the distance, the operating time to know the / km can also be realized with a menu 2. The .ino program as an attached file, But it is not possible to put an attached file in ISIS electronic labcenter? What is this forum? It would be desirable that the compiler could generate the.cof to debug in Isis and test the program line by line .... Arduino still has to make a lot of effort to be on the same level as other microcontrollers 10. speed measurement (tachometer) Velocity measurement is carried out using a hall effect sensor SS495 or A1324 which counts each revolution of the wheel. It is enough to enter the perimeter of the wheel of the scooter (130mm of radius therefore 0.816m in the case To have the speed, it is enough just to divide the number of turn of wheel on an arbitrary time of 1s to have a minimum speed of 0.81m / s therefore of 2.93 km / h. In addition, an average filter with 3 values will be used to display the speed. At 25km / h, there will be 8.5 laps. To count the turns, an external interrupt routine will be used on input INT0 21 of the mega card. To simulate the speed, a pulse on input 21 will be used with a duty cycle of 10%. Code: [Select] void INT0b21() {   Tspeed++;   // External interruption to count the number of turns } // In the set up declare the interrupt routine when the 5V edge of the magnet detection is done   attachInterrupt(digitalPinToInterrupt(21), INT0b21, RISING );  // External interruption // In loop if (temps09>=5)  {        // 1 second loop lcd.setCursor(13,2);      // Erasing speed lcd.print("kph     "); lcd.setCursor(16,2); speed1=Tspeed*2937;      //1tour*816*3.6/1s=2.937km/h speed2=speed1;           //Tspeed (rate/seconde) speed3=speed2; speedF=(speed1+speed2+speed3)/3000;   // To put in kph lcd.print(speedF,1);    // Display to the nearest tenth Tspeed=0;   // Reset counter temps09=0;  //reset time } To improve the accuracy of the velocity measurement, it is possible that the sampling time of the velocity measurement is dependent on the velocity. For example: For speeds less than 10km / h sample at 1second, but above 10km / h sample at 2 seconds. 11. Distance measurement for autonomy The distance corresponds to the total number of turns of the wheel multiplied by the perimeter of the wheel. So do not set the number of turns to 0 for each sample. On the other hand, the reset of the distance will be done when pressing the reset of the Arduino Mega. The distance display will be displayed to the nearest second. At 32km / h, it will take 2 minutes to do 1km as can be seen in the following figure: Code: [Select] void INT0b21() {   Tspeed++;   // External interruption to count speed   nbrRate++; } lcd.setCursor(13,4);      lcd.print("km      ");  // distance=(nbrRate*816)/1000;  //distance m distance=distance/1000;  //distance km lcd.setCursor(15,4);      lcd.print(distance,1);  You can observe the electrical installation with the chopper, the arduino, and the display when the program is set up 12. Synthesis The RAM space is used only at 4% and ROM space at 3%, for an Arduino mega. So we could take an arduino a little smaller. But, there are 8 Lipo cells to make the 24V power supply to power the engine via the chopper. Therefore, the voltage measurement of each element will be on the Arduino with a JST connector. This measurement makes it possible to know if a cell with an internal resistance which begins to pose a problem and to know if the balancing of each cell has indeed been carried out. It is possible to switch to 36V with 12 cells also with the arduino mega without using an external shield that multiplex 24 analog inputs on input A0 It is possible to send all data to a smartphone via Bluetooth HC06 via pins 20, 21, RX1 and TX1. But the application under android realized under JAVA Studio can not be shared on this forum. This part will not be explained. After having made the instrumentation of this scooter, a study should be carried out on the precision of the measurements, it is possible to read "Instrumentation of a low-power electrical motor vehicle" eco marathon "type Revue 3EI N ° 81, July 2015

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