Echo Location / Arduino / Michropones

Hello guys, So, I´d aprecciate if you could give me any ideas about echo location using microphones or ultrasound detectors, the idea is to put three or four sound detectors and put any object in the middle so that way because of the sound I could know where the object is, by using the detectors

Topic by JoséG100   |  last reply

custom made tire cover

Last summer I bought my '07 Jeep Wrangler. The previous owner had added some stickers and a spare tire cover to make it look like he had the "Call of Duty" package. That's not my cup of tea, so I took that stuff off. I would like to add my own design to the spare tire cover. I actually have the design ready to go on Photoshop. I though maybe I could take it to a place like Staples, have it printed as a vinyl sign, and then use a strong adhesive to glue it to the old cover, on top of the Call of Duty stuff. I imagine, though, that there are probably some adjustments to this whole plan that would help things turn out better. Any advice?

Topic by Purple Chez   |  last reply


Morning all from the shire or Oxford UK My names is Rory, happy to be a member of the site and always enjoy a good discussion Thought it would be helpful for myself and others to start a bit of a debate about 3D printers in general. I build my own 3D printer last year and was happy with it the 6x6x6 results were not the best but better than anything I had produced before, I regreted ever selling it TBH but now the time has come for me to think about getting another. Ideally looking to have a scanning unit too but it is wether to build or buy.......TOO MUCH CHOICE!! Since last year ive seen a massive jump in the tech used in this area and my main questions are: What do each of you use and why that specific printer? Whats your best results ( best object made ) which to people perfer shop brought (ready made) or home made (DIY KIT) If you could choose any 3D printer what would it be? Cheers all, Look forwards to seeing how this thread discusses this topic

Topic by Jedi_zombie85 

Can you piggyback RF communications on cellular transmit/receive frequency bands ?

My question is purely hypothetical and there is no immediate plans for any such application. But I was just curious is it possible to make use of the cellular frequency bands (as set out by a country's regulations and by the cellular providers) for some sort of covert type communication other than for voice, data or text types of cellular communications ? Would it be too difficult and complex to develop such an application that uses cellular radio frequencies or could it be done without too much concern for potential interference or the sharing of channels of nearby normal cellular transmissions ? Could such an application be developed without having to cross over many hurdles ? If this covert communications is possible would the cell frequencies used not reach the base stations of the wireless carriers as noise or can a peer to peer communications be possible by passing the base stations ?

Topic by victor43   |  last reply

Mobility scooter maintenance

I have a Monarch Ryder mobility scooter and I need to occasionally pump up the tyres. The problem is that I live by myself and it is very painful for me to bend down low enough to attach the hose to the tyres in order to pump them up. I have been going to my local garage and they have done it for me so far, but I want to be able to do it myself. I have considered investing in a ramp but I have no way of supporting the top end. I did think of getting solid tyres that never need air, but I've been told that this would make the ride very painful for me as every bump would be amplified. Is there any sort of long hose I could permanently attach to each tyre that I could secure higher up on the scooter when I am not using it? Does anyone have any other ideas? 

Topic by cguide   |  last reply

Electric Power Generation and Resistance Questions

Okay so I understand the basic concepts of power generation but I have a question pertaining to the old addage: An object in motion tends to stay in motion. Resistance is power that stops any said object if it is equal to the energy of the object in motion - this resistance is from gravity and other outside forces acting upon said object. OKAY If the force to put an object in motion was then then collected by electrical generators from multiple other sources as part of the same object - would it be able to make up for the amount of resistance from the added collection and the amount needed to put said object into motion and keeping it in motion???? If an object is designed to be in motion then it does not require as much energy to stay in motion as it does to be put in motion. Even when affected by gravity, as it is affected by gravity less when is in motion. But can technology (bearings and rotors) be designed so they offer less resistance than the amount of energy required to keep said object in motion? This is impossible as far as I am aware. Energy is NOT free - but If the energy required to keep an object in motion is less than required to put it into motion, would not the true energy of the object in motion be greater than what is required to keep it in motion and be able to be collected as excess energy? Collection would result in resistance however and since the formula of "greater or equal force" applies collecting anything other than that differential in energy would result in the objects motion being slowed. Is this true? I am concerned about going into details on the nature of my concept until I can gain a better understanding of the science behind it. As such I apologize for how vague my questioning is.

Topic by Tetsuoh   |  last reply

can i make cnc machine from printer epson cx3900 and cx 4300

Hello evrerybody, i am new here and first i want thank all of you for all the great thing you make and present on this heaven and i wish all the best to the team of this site to get succes which they deserve for me i like to make defferent things and recycle everything i have to use it by other way instand to throw it away and for my qeustion is can i make a CNC machine ( vinyl cutter or somthing other )  from printer inkjet &without; arduino ? ( i have tow printers epson cx3900 and cx4300 and its both working but i dont need them ... i also have cd & dvd drives abd also floppy drives and old scaner and many other things in my stock ) if yes or no whats the easy way for the beginner to entre this domain, i have some experience in electronics and wood working and i think that i can make some works i wish to get your advices and thanks

Topic by rafik40150 

Fighting with Nylon ;)

As some might know I still use an old Gen1 Prusa but love the challenge of basically getting everything done with that oldie. One of my latest challenges of "always" printing on a cold bed includes Nylon. If you ever had troubles because you ABS or PLA filament got too moist you will already know what happens to your print... Nylon is even worse when it comes to moisture as you can't see or really feel it. I was thinking of making a complete Nylon guide as an Instructable but think I will start here to kick off some discussion first. So, we know the Nylon must be really dry for a god print as otherwise we get bubbles, bad adhesion and of course a foamy looking print. Well, not really... Let me explain: A perfectly smooth and shiny finnish is not always required, and with the right settings Nylon still forms strong bonds even with a foamy look. However, the dimensions of parts are affected as well - outside dimensions go bigger and hole diameters smaller. If that is no issue for your print then there is no real need to perfectly dry your filament ;) Speaking of drying: People use all sorts of methods to dry their filament, not just Nylon. One of the most common and most expensive seems to be the use of your oven for several hours to dry it. Another way involves food dyhydrators, bit less on the energy bill but still... Then we have the smart guys using the sun and silaca gel for the drying - good and great but so useless in cold and wet climates... My advise here: Take your time! I mean, sure you want to print right after the filament arrived in your letter box but a bit of preperation will save you filament and frustration. Usually filament comes in a sealed bag with a pack of silica gel and it should be dry and ready to use. But Nylon can become too moist within the time it takes to finnish a long print if you are in a wet climate. This means you start printing and all is good but the next day your new print looks ugly as for no real reason. Make use of these sealed storage containers. Put the filament in there with a good amount of indicating silica gel and only have a hole to feed the filament through - if in doubt use a bowden fitting and a short lenght of teflon tube to prevent friction. A piece of sticky tape over the hole when you don't use the filament and the filament is always ready to use. Reminds me to make an Ible for a suitable storage solution with spool holder... Anyway... When it finally comes to print Nylon you should know cardboard works best as a bed as Nylon sticks really well to it. I glue mine onto a layer of masking tape, this way it won't lift from the bed and I can still replace it very easy. But the most common mistake with Nylon is to print it too fast. The stuff really expands and shrinks a lot from filament to print and high speeds only too often cause the layers to seperate later on. Some people compensate with higher temperatures but I don't like the idea of fitting a filter system with activated carbon filters... Also keep in mind the intense shrinkage when setting the extrusion multiplier! If your ABS prints fine with 0.85 you can expect that the same sized Nylon prints fine somewhere in the range of 55-60! Now you also know why printing with thick layers is not such a great idea if you require all dimensions to fit. Although only outside accuracy can be done by cheating in the settings, getting outside, inside and extrusion widths settings accurate is almost rocket sience ;) Nylon is expensive or not available here in the diameter I require.... I had the same trouble and reverted to trimmer line and a modified, dedicated hotend instead. Why dedicated you wonder? Nylon can be real pain to clean as nothing dissolves and if you heat the parts hot enough to melt it you can not work easy with them. Having a decicated hotend means you won't run into the problem of burnt ABS or PLA clogging the nozzle ;) It also means you can match the hotend to the trimmer line you choice (more on that in a minute). For example, in some areas trimmer line of 2mm or 3.3mm diameter is the most popular and cheapest. Just drill out the hotend to cater for the new diameter, which I did after noticing the filament got stuck in the neck of the cold end ;) Trimmer line - does it matter which one? It does these days! Avoid everything that is not round or labeled with terms like "duracore", "dual core", "multi layer"  -basically all that indicates it is not just a single, solid stand of Nylon. Long lasting, special core line is great for your lawn trimmer but really bad for your hotend! PET, High temp nylon or even fibre re-inforced cores are in use, so in the best case you mix the nylon with overheating PET, in the worst you block your nozzle permanently. If it looks like it has a core or some sort of "mantle" around it, it means not usable.

Topic by Downunder35m   |  last reply

Satellite to Radio to Pneumatic Valve

I want to receive some sort of satellite signal with a radio and then use the data I receive to control a pneumatic system to replicate a heart beating. I have been talking around with some people who know a bit about radios and the such but haven't gotten much conclusive help.  I would like to build as much of this as I can myself, the entire radio and everything, though I only have about a month to do it. A DIY radio kit paired with an Arduino might be the answer due to time restraints.  What i've learned so far is that I probably want it to be a tunable AM radio. Whether or not I should build that myself from scratch, build a DIY kit, or just purchase one, I am not sure. How to then interface that into a system to then control a pneumatic system, I have no idea other than the obvious arduino. Lastly, I don't need any special signal from the satellite. I really just need to receive a voltage from the radio. Though, hooking into a satellite with an onboard atomic clock so that i can then display the time as well would be great. I am going to keep doing research, though if anyone here can lend a helping hand I would be very appreciative!

Topic by dlandry2   |  last reply

Nylon and substitutes on a cold bed

It's been some time and I made progress with Nylon. Aldi had some cheap craft glue with methanol as the solvent - this stuff works great for PLA, ABS AND Nylon. The common problem with nylon is that it has no real adhesion to anything, except cardboard and bakelite. Cardboard makes a clean up nightmare and bakelite is not always easy to find, especially not the right type. So I tried various glues, paints and primers but none was really suited for all printing needs. And the cleanup of the bed is imoprtant too as I did not want to spend hours scrubbing with acetone or similar nasty solvents. After the first great succes with the clear Aldi craft glue I checked the local 2$ shops and carft stores and found similar glueswith methanol as a solvent. Since not everyone is lucky enough to get these specials I will tell you what to look out for if you try clear craft glue: Don't buy anything that can be cleaned up with water - you want methanol or ethanol as the solvent in the glue! Do a test with the glue on something that usually does not bind well to cheap glue, like glass and blister packs. Let the glue dry and peel it off - it should be a clear film that is quite strong and barely streches when you pull it. It almost feels like hard paper. All good so far? Check if the nylon, pla or abs really sticks to it: Spread a very thin layer on a piece of cardboard and let dry. Add another, thicker layer and let dry again. Now hold it under your nozzle and extrude a bit of filament while moving the cardboard around. Let cool and check how good it sticks. In a perfect world the cool plastic should peel the papaer off with the glue. Time to prepare your print bed the same way and to start printing ;) Just use a very thin first layer and for the first layer much lower speeds than usual. I print nylon with 60mm/s and the first layer at just 25mm/s, any faster and the first layer does not look right. ABS and PLA are much more forgiving here.

Topic by Downunder35m 

New DLP Printer with the LARGEST build volume on the market

Hey Guys, We are now kindly inviting everyone to finish a survey for us. We are now developing the next generation of our DLP 3D printer, and we really need to gather some opinions before it hits Kickstarter. It will be a DLP printer with the largest build volume on the market, and it will provide the best solution to SME, MakerSpace and personal users. There will be only 8 questions, and every member will be notified before we launched to make sure that every one gets the Early Bird reward if you are interested(remember to submit to our newsletter). You can find detailed information including tech specs and test prints by visiting our demo website(which is free, and will be reconstructed later): Demo videos are coming soon, please stay tuned. The survey is on the "More" page, so help us get some feedback. Thanks!

Topic by Waterrobertie 

Can Hardwood Shred ABS?

I am thinking of making a prototype plastic crusher/shredder out of a hardwood instead of steel. Do you think that a hardwood would be able to grind a plastic such as abs into small pellets? If so what kind of wood would be best? What if I made a plywood out of hardwood to strengthen the grain? What if I just use nice plywood?

Topic by rednax718   |  last reply

Contest : Bike Weapons

I was hoping to pimp out my bike with James Bond esque weapons. An example would be a way to deploy oil, tacks, smoke, or water out the back of the bike. Rockets wouldn't be so bad either. Mines or flame thrower would be great. Try mounting the control box on the handle bars. I do have basic Oxy-acetylene setup that is good for all around jobs. I also have black powder and other chemicals like KNO3. Please leave a picture below of the project with details, plans, etc. etc. I know there are a lot of bright minds out there who would find this fun and challenging project tailor-made for them.

Topic by DELETED_M4industries   |  last reply

To all Bike riders/cyclists/commuters: What do you ride?

I ride a 2000 MGX DxR [yes, the crappy, chinese, walmart version] to work every day, road commuting. I also ride it off-road, singletrack, streams, washboards, you-name-it-I've-ridden-it, with no issues. thus far, I have put around 19,000 miles on it, all told. totally original [otherthan tubes, tires, chain, cassette, brakes, etc] parts, still weighs 38 pounds. Anybody else ride something as cheap and inappropriate as commuter? What do you ride every day? any bikes you'd LOVE to have? Any funny bike stories? Cheers,    B.E. 'Brick' Montgomery 

Topic by Hazzard2theworld911   |  last reply

First Motorcycle, budget

Hi. I've recently been hooked on motorcycles. I'd love to get one and start riding and working on one. There are a few problems. First off, I'm only 13 years old, but I'm 5'11" and 160 lbs. I know that it's illegal for me to ride a motorcycle, and I'm not even sure if I can take a mfs course at this age. I wouldn't be riding on any big roads, and would barely even ride it, besides riding it to my best friends house (he'd help me work on it, his dad is into bikes, and he only lives a few miles away), and around a few back roads in my neighborhood. My dad has been riding motorcycles for before I was born, and has multiple types and sizes of bikes (he has a touring Harvey, I believe it's a VRSC, a ninja 600, and a dirt bike which I don't know the model of). He could teach me and show me how to properly ride a motorcycle. Also, I don't know what kind of bike to get. I've heard dual purpose bikes are good for starters, but I really have no idea where to start. I'd appreciate input. Preferably it'd be a bike that I could work on and modify/upgrade as I go along. Thirdly, is price. I don't really know my exact budget, but it'd be around $600-$700. I know it's barely anything, but I'd have to pay for the bike myself, and that's all I have. If it's even possible to purchase a bike at this price point, it doesn't even have to run, I'd love your input. Ideally I'd like to keep everything to the absolute bare minimum, as cheap as possible. My dad already has safety gear, and I could borrow it if I rode my bike.  Again, thanks for your input, and any and all suggestions will be greatly appreciated. 

Topic by IvanT3   |  last reply

Thor's hammer with microwave magnet

Did you guys see this! I bet one of you could make one too! Pretty cool! Enjoy! Someone Built A Real-Life Thor's Hammer That Can Only Be Lifted By Its Creator

Topic by BLASTFEMI   |  last reply


I put Science just because I don't know were to post this. I would like to thank instructables . I think this is the greatest website that I have ever found. I have never seen anything so informative . I have done lots of the projects on here and I will be boing many more . This site is truly amazing Thank you so very much. Bryan Benson

Topic by BryanB7   |  last reply

Plastic Solar Cell

Hi, here anybody did try to make plastic solar cell at home ? Eager to learn next-Gen science Here is some video on Plastic solar cell

Topic by ruchitinfushion   |  last reply

Flexible & Cuttable Solar Cells

Hi everyone,  I found this video about Flexible and Cuttable Solar Cells: Does anyone have experience with them? I would like to do some energy collector balloon with them. Cheers!! 

Topic by poldarko 

Coanda effect in conjuction with Venturi effect !?

I am still working on my project to create relatively accurate model of a Repulsine. No, I am not one of those free energy nut balls, just curious in old tech ;) As part of my research I came across some statements in regards to lost pieces of the Repulsine. The last remaining model still exists in Austria but noone seems to have to clue what the missing parts looked like. I think the missing parts are a system of nozzles, diverters and a secondary hull - forming a similar system like the Coanda plane engine. There are lots of people still out there tinkering with Coanda lifting devices and trying to get them working. Is there anyone here doing it ??? Would like to exchange some knowledge, tipps, designs and so on. Short term goal is to make working Coand engine with enough thrust / lift to be used at a later stage for a working Coanda plane model. Long term goal to modify it all to incorporate into the Repulsine.

Topic by Downunder35m   |  last reply

208/240 transformer question

After having several (like 4) thermostats fail in a 6-year period, it finally dawned on me to check the voltage from the transformer and I found it to be a bit over 28 volts. My condo building has 208V service. The transformer in my air handler is a 208/240V one and was wired to the 208V terminal. I removed the wire from the 208V terminal and connected it to the 240V terminal and then found the voltage to be 24.2V. So I have possibly solved the problem of the thermostats failing but my question is, will this cause any damage to the primary (or secondary) of the transformer? Thanks in advance!

Topic by kvander51   |  last reply

how can i transfer data file from sd card to my Windows PC through WIFI.

Hi I'm using the Arduino to log data on to an SD card and I would like to be able to transfer that file on the card to my Windows PC for further use it, through WIFI. how can i make that possible.

Topic by SoufianeG   |  last reply

CREO, SolidWorks, Catia, Etc.?

Sort of a broad question here - if it deviates too much from the theme of these forums, my apologies. I was just curious to know, of those of you who use manufacturing design software, which do you prefer and why? 

Topic by PlasticPanama   |  last reply


Is there anyway to create an EMP that could take down a whole building that is handheld?

Topic by gsyme13   |  last reply

cold explosions

I know that by adding ammonium nitrate and water the compound gets cold. so my question is by using ammonium nitrate and other then water can I use to make extream pressure build up in a short time while still being cold. this question is not for any explosive device to cause harm to anyone or thing. just wondering if a cold explosive could be possiable. thank you

Topic by pokiesmokie   |  last reply

How to change 12v outlet from always on to turn on and off with ignition

I have a 94 gmc sonoma sle 4.3L V6 and I wanted to make the outlets turn on and off with the ignition but I don't know how to do it exactly. I have 3 outlets which are always hot (have power), and I would like to be able to at least make them all turn on and off with the ignition. But it would be nice if I could choose which individual outlets I want to have on all the time and which ones I want to turn on and off with the ignition, this would be done with either a switch of some sort or have the ability to move the respective fuse over as if it were a jumper.

Topic by SLIMDADDYC   |  last reply

Replacement DND Chip (1076-6318w) for Mitsubishi XD221U

Hi Guys, Where can I get a replacement DND chip (1076-6318w) for a Mitsubishi XD221U for a REASONABLE price?

Topic by rkirk77   |  last reply

Not Original Tutorial enter the Contest and few of then has be a winner

I found some tutorials that I think don't original after searching from the original source. a few of  them enter for the contest and some became the winner. I think it is not fair to the other. my new account I created is indeed only to convey this by intention so that nothing happens. Thanks i think is not original tutorials.  the original at (just copy paste) is differen author the original is (copy paste) differen author and many more i think.

Topic by mark kelvine   |  last reply

Smallest Partical?

I know atoms,guleons,gravitons,ions,quarks,ect. I cant ask what is the absolute smallest size of an atomic partical,but what is the smallest YOU know?

Topic by SovietTrollDash   |  last reply

Chopping Up an stl file into multiples

Hi Everyone, I'm looking for some software help.  I have a single stl file of a Johnny 5 robot.  I don't want to print it all in one part. What I'd like to do is chop the arms, head, and other random parts off, and save them as separate stl files so the robot can be re-assembled. Ideally the chopped off arms would have male-female connectors to fit back into the body they were removed from. I'm looking for input as to what would be the best method to accomplish this both in software and technique. Any ideas would be appreciated.

Topic by gravityisweak   |  last reply

Custom car

Ibuilding a custom car body out of polystyrene foam. Any advice on what to cover the foam with to strenghten it. I was thinking abot fiberglass but was really hoping to avoid it if possibe. Any suggestions on a strong alternative to fiberglass would be appreciated.

Topic by rednax718   |  last reply

Bicycle Mudguard

Hello there, people. First post here, been a member for a long time but only used to read instructables, but now im in need of help with a project. Im making a mudguard for my bicycle and im using a plastic folder. I know it sounds a little strange, but ive seen a lot of tutorials for mudguards made from some type of plastic, soft or hard. For example the ones made from a plastic cutting board. The first photo is of the folder and my question to you guys is, how do i make creases on the folder like the ones shown in picture 2. creases that help you fold the folder in those certain places.

Topic by OG-Jay   |  last reply

what are household oxidizers?

I have been into rockets for a while now but am growing old of the model ones. i now wish to make my own, but am finding it hard to come across oxidizers. they seem to restrict everything now days because a bunch of cowards flew some planes into buildings in a country 9000kms from me(AUST). talk about game wreckers. what common household products have duel purposes?

Topic by QuestionableHat   |  last reply

How clouds act as an air pump to suck in air. Not how you think they do!

I have been thinking a long time about the biotic pump theory but I still don't understand it.  The math is too hard for me.   BUT it got me to thinking.   It is a point of major dispute in the meteorological world.   Does condensation cause low pressure?  2 russian nuclear physicists say yes,  almost everyone else says no!   So,  I thought and thought and thought.  Now I think I have a simple enough explanation And yes, they may not necessarily cause low pressure under the cloud (probably do)  but they definitely suck in air from elsewhere.  Imagine a fleet of huge doughnut shaped dirigible airships. They are sitting at 10,000 ft just floating there.   Now the commander tells everyone that they must now fly at 5000 ft.   So they turn on their propellers (in the hole in the doughnut) and drop down to 5000 ft by propelling air up  through the hole.   Now staying at 5000 ft is achieved by running the propellers at just fast enough.  So at 5000 ft they are pumping air from under the doughnuts to above them.   Now imagine a cumulus cloud.  Even though it is not fixed in size or shape and it does not have a propeller,  it is doing the exact same thing.  Air is being pumped up the middle and the clouds are sitting lower in the sky than they "should",  because they are sending that column of air up into the sky.   Here is my video to explain it visually.

Topic by gaiatechnician   |  last reply

Trailer (from old truck) Differential can Seize?

Do i recall correctly? Can the wheels seize up because of an issue with the differential?

Topic by Toga_Dan   |  last reply

Printer disconnecting or USB port disappearing in Windows

First I thought to make an Instructable out of it but realised there are too many different printer models out there, so this time no images. What is this about you might wonder? Well, let me tell you my story first and you might see similarities to your problem. It all started with me getting a new PC as the old one got memory problems (RAM modules failed). After a few successful prints I noticed errors coming up in the log window. Mainly things like communication problems and that some data is sent again. Realised that on my new PC I did not check the speed settings for the COM ports, so I adjusted them to match the printer board and moved on without even bothering to check the logs. Then, half way through a bigger print, it all stopped and I could not even connect to the printer anymore. After a power cycle on the printer all was fine again but the error kept coming back every now and then. At this point I started to read up on the problem and the most common recommendation is to print over SD - too bad if your printer does not support it and too bad it does not address the issue at all! A few more technical answers pointed to the Logitech drivers, especially mouse, keyboard and 3D vision. As I was using the same outer hardware as before and also the same drivers (and same version numbers) I simply ruled this one out too, although it might be a vital clue for others. When starting to get frustrated and after opening a cold blonde I remembered that I had a similar issue a long time ago and that it was related to loose wires on the screw terminals for the power connection. Measured it all but according to my trusty multimeter all was fine. Now comes the fun part: I friend of mine with a HiFi fetisch was here when I testing the connection and he started laughing at my attempts. He explained that ALL his connections, no matter if power or audio signal are oversized! Here I started to wonder if he is up to something and looked up similar circuit board mounted power plugs. To my surprise they are all rated for anything between 1 and 5Amps. Even without a heated bed powered by the printer board I think everyone will agree that a max 5A connections is not enough. My frined then offered to check the plug and connector at his place - what a great thing to have friends :) He used a signal generator and small speaker with the plug as a connector between them. With an oscilloscope connected to both input and speaker you could see, while moving the plug, that the audio signal become somehow unclean - there where spikes and missing bits everywhere depending which way you wobble the plug. After taking the whole thing apart the destructive way we saw the cause: overheated contact areas with discolored surfaces. I replaced the plug now with a 250V/20A one from an old laser printer and had no USB or connection issues ever since. Ok, what's the thing with power and USB problems on a 3D printer? Almost all printer boards have the ground connections bridged to avoid interference on the USB signals. This mean, in case of a faulty power connection or one that is "dirty", the USB port on the computer can receive back EMF signal or even a voltage spike. In return a smart bios either disconnects the port or disables it until the problem is solved, in our case by restarting / reconnecting the printer. But even with no obvious signs of power problems you can get  a so called "dirty" connection. Dirty covers all from corrosion, worn springs for battery compartments, overheating or in the old days burnt relay contacts. For our printer it usually means that either the soldering connection on the board or a screw came loose, in rare cases like mine an undersized connector can burn out due to being unable to handle the currents. The bad thing is that you can not always spot these problems the easy way... Is there an easy way to tell that my USB problem is caused by a faulty power connection? Yes and no. Some boards offer indicating LED's, you connect power and the LED stays on even if the printer is disconnected from the PC. If it is more than just a Power on" indicator" this LED will be off after the printer stops working and in the device manager your serial port for the printer is gone. You might also hear the warning sound from Windows in regards to a device being disconnected. If all the above is true than most likely your power connection has a problem somewhere - if in doubt replace all screw and plug connectors for the power. Sometimes the problem is less obvious. Your print software might show communication problems in the log window or re-send a lot of commands. If the speed selection for the com port is the same as for the firmware of the printer board and as set in the printer software, it could also be a power connection problem. But to be on the save side try a shielded cable with ferrite cores on both ends first for the connection between computer and printer. Can I take any measures to prevent the problem? Sure, you could solder everything and make sure the wires are fixed in place so they won't move. But a simple indicator might be enough: Solder a piece of LED strip to the power connection on the circuit board - if the connection has trouble the LED's will show it in most cases by changing light levels or flickering. On top they act as a nice light to see what's happening during a print.

Topic by Downunder35m 

Microwave Transformer

I have salvaged a old microwave transformer that i am going to use for a SLA battery charger i am building. I have rewound the secondary with 50amp wire and i get an AC output of 12v what is what i want but im confused with working out how many amps it puts out. I have run it through a bridge rectifier and a capacitor and i get about 18V DC. I was testing the amps by adding 12v 50watt light bulbs to it 1 at a time and when i get to 200watts the voltage starts to drop to about 10v DC. My question is does that mean the transformer is being overloaded? and if so is there a way to increase the amp output by winding secondary with different wire? I have seen online videos of Microwave transformers being rewound and they give out 50amps at 12v.

Topic by JamieG14   |  last reply

3D Printing in the Glass Medium

I've only used plastics when 3D printing so it's pretty cool to see a movement into the glass medium. Besides the practical application, the video of the printer creating glasswork is quite pretty.

Topic by PlasticPanama 

Need Circuit Diagram for 5 Watt 12v LED Connect to 6v 5Ah Battery

Hai Friends, I have 5 pieces 5 watt led's. Led Specifications: Model - 5 watt, Forward voltage (VF) DC 9 - 12v, Forward current  (IF ) - 900MA, Output lumens  - 800 - 900LM, Color temperature -  6000 k, operate voltage - 9v to 12v DC I want to connect these Led to a 6v 5Ah Battery. (Used in emergency lamps.I want to replace the old tube light in the batteries and replace with these led's.) I need the circuit diagram for the project.With Low and high Brightness modes.Please help me. thanks in Advance to those people, who are going to help me completing this project....

Topic by jinto1729   |  last reply

Arduino controlled lawn mower

Hi I  wants to make arduino controlled lawn mower as my Mechanical Engineering final year project  while doing so I’m facing problems such as which dc motor will be suitable for wheels and cutting blades  and driving unit for these motors.,which sensors are necessary for complete automation as well as coding required while implementing all these components. It is difficult for me to finding formulae to calculate torque and power.I want to make it process automated so that bot automatically move in rectangular area and if in between it’s battery gets down it should automatically go to charging point and come back to place where it stopped cutting when battery was down. For this which coding as well as interruption required is also a doubt for me.For all these operation which battery will be useful? And its capacity Also it will be helpful if all the components required for this project will be available from any single platform. For all these it will be helpful for me if I get some Ideas from here and move ahead in my project Any other links or suggestions wil be also helpful.If kit for above mentioned specs are available please contact on my mail id Thank u

Topic by pratiksarvankar   |  last reply

DIY Car Carpet?

Hey, I have a 2000 Toyota Echo with holes in the carpet I've done a fair amount of searching, but I can't find an aftermarket manufacturer that sells pre-molded carpets for this car. Has anyone experience in replacing their car carpet with a custom carpet? How do you compensate for the lack of molding? Thanks, kd.

Topic by killerdark   |  last reply

problem with annotate()

Hi im trying to plot live data on python from an arduino through the serial port  i found some difficult with annotate function i don't know how to configure the third parameter (position) python code import serial # import Serial Library import time #import time import numpy  # Import numpy import matplotlib.pyplot as plt #import matplotlib library from drawnow import * temperature= [] vitesse= [] charge= [] current= [] Time = [] arduinoData = serial.Serial('com5', 9600) #Creating our serial object named arduinoData plt.ion() #Tell matplotlib you want interactive mode to plot live data cnt=0 ##fig1 = plt.figure() STARTINGTIME = round(time.time(),2) def makeFig(): #Create a function that makes our desired plot         plt.subplot(2,2,1)     plt.subplot(2,2,1).annotate(str(temperature)+','+ str(Time), textcoords='offset points')     plt.title('Live Streaming Temperature Sensor Data')     plt.ylabel('Temperature C')     plt.grid(True)     plt.plot(temperature, 'ro-')     plt.subplot(2,2,2)     plt.subplot(2,2,2).annotate(str(vitesse)+','+ str(Time), textcoords='offset points')     plt.title('Live Streaming Speed Sensor Data')     plt.ylabel('Speed KM/H')     plt.grid(True)     plt.plot(vitesse, 'bo-')     plt.subplot(2,2,3)     plt.subplot(2,2,3).annotate(str(charge)+','+ str(Time), textcoords='offset points')     plt.title('Live Streaming SOC Sensor Data')     plt.ylabel('Battery Charge %')     plt.grid(True)     plt.plot(charge, 'go-')     plt.subplot(2,2,4)     plt.subplot(2,2,4).annotate(str(current)+','+ str(Time), textcoords='offset points')     plt.title('Live Streaming Current Sensor Data')     plt.ylabel('Current A')     plt.grid(True)     plt.plot(current, 'yo-')     while True: # While loop that loops forever     while (arduinoData.inWaiting()==0): #Wait here until there is data         pass #do nothing     arduinoString = arduinoData.readline() #read the line of text from the serial port     dataArray = arduinoString.split(';')   #Split it into an array called dataArray     temp = float (dataArray[0])     vite = float (dataArray[1])     char = float (dataArray[2])     curr = float (dataArray[3])     temperature.append(temp)                     #Build our temperature array by appending temp readings     vitesse.append(vite)                     #Build our vitesse array by appending temp readings     charge.append(char)                     #Build our charge array by appending temp readings     current.append(curr)                     #Build our current array by appending temp readings     Time.append(round(time.time(),2) - STARTINGTIME)     drawnow(makeFig)                       #Call drawnow to update our live graph     plt.pause(0.00001)     cnt=cnt+1     if(cnt>50):         temperature.pop(0)         vitesse.pop(0)         charge.pop(0)         current.pop(0)

Topic by SoufianeG   |  last reply

Rice planter

Can someone please help me in making a manual rice planter. thank you.

Topic by avinash_86   |  last reply


I'm of the few that feel like HoloLens seems like more of a pain than anything because of its perspective crop. For anyone in the dark, here's the article on HoloLens that I'm referring to. It's a cool concept but I don't think it's quite ready for the marketplace. 

Topic by PlasticPanama 

Anybody interested in building HHO generators?

I'm keen on starting a serious discussion group of folks who share my enthusiasm for HHO alternative fuel generators. Thus far there's only been one Instructable (Serge) and loads of YouTube videos, but most other sites either want to sell you plans or sell you a retail device. I'd like to start a club of sorts with folks who want to 'roll their own' but perhaps lack some of the electronics or other material fabrication techniques. We could help each other design & build stuff (like an hho generator for you car) and then post the how-to's here on Instructables. Anybody interested?

Topic by MY   |  last reply

problem with UDP.print

Hi everyone my problem is that i want the send 3 sensor data over ethernet UDP in one time  and i don't know the way to do that thank's for your time #include //Load Ethernet Library #include //Load UDP Library #include //Load the SPI Library byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xEE}; //Assign a mac address IPAddress ip(192, 168, 1, 252); //Assign my IP adress unsigned int localPort = 4000; //Assign a Port to talk over char packetBuffer[UDP_TX_PACKET_MAX_SIZE]; String datReq; //String for our data int packetSize; //Size of Packet EthernetUDP Udp; //Define UDP Object float temp; //temp means temperature float speed; float charge; float dataSend[] = {temp, speed, charge}; int temp_ADC; int speed_ADC; int charge_ADC; void setup() {   Serial.begin(9600); //Turn on Serial Port Ethernet.begin(mac, ip); //Initialize Ethernet Udp.begin(localPort); //Initialize Udp delay(1500); //delay } void loop() {     packetSize = Udp.parsePacket(); //Read theh packetSize     if(packetSize>0){ //Check to see if a request is present, UDP_TX_PACKET_MAX_SIZE); //Reading the data request on the Udp   String datReq(packetBuffer); //Convert packetBuffer array to string datReq     if (datReq =="ordre") { //See if Red was requested       temp_ADC = analogRead(0); //read analog input on pin A0     temp = temp_ADC * 5.0 * 100.0/1024.0; // ADC to celcius conversion      speed = analogRead(1); //read analog input on pin A1     charge= analogRead(2); //read analog input on pin A2     Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());  //Initialize Packet send     Udp.print(temp); //Send string back to client     Udp.print(speed); //Send string back to client     Udp.print(charge); //Send string back to client     Udp.endPacket(); //Packet has been sent     delay(1500); //delay   }      } memset(packetBuffer, 0, UDP_TX_PACKET_MAX_SIZE); }

Topic by SoufianeG 

Whats in a LOCOMOTIVE Balloon Smokestack?

Is it just a screen spark arrestor?  Ive been seeking unsuccessfully for a cutaway diagram.

Topic by Toga_Dan   |  last reply

Current Consumtion by a DC Motor?

 I am asking few questions EV related, more current related. Let a consider a dc motor rated 4hp at 24v and 2hp at 12v. So is there a way to calculate ampere draw of the motor at various loads.(like no load, full load, or any load). And if we know the full load current of the dc motor then can we calculate the max load for the dc motor. Next as the dc motor is 2hp at 12v then will this value be constant or will the motor be able to produce 4hp at 12v even rather than at 24v. And will a battery eg 50ah be able to supply more then 50amp.

Topic by flyingdutchmen1659   |  last reply

Statistical Process Control

Is there any interest in Statistical Process Control? I posted one instructable about it: I am considering an instructable to measure the quality of resistors. Do they really hold 5% tolerance? The test is simpler than the test in my last instructable, and I would get deeper into the maths.

Topic by JRV31   |  last reply

Can you build a pmdc motor that can pull a skateboard prety fast on 240W?

I'm trying to build a pmdc motor (perminent magnet motor) based on this video: But I want to make it in a much biger scale and instead of using a ceramic magnet I wan to use 2 big industrial neodymium magnets instead they will pull up to 200 pounds. I want this homemade built motor to pull a scooter like vehicle (skateboard if you will). It will be powerd by 2 12V 10A batteries wich doing the math should get me: 12V+12V=24V 10A+10A=20A 24Vx20A=240W The coils will be made from 1.5mm thick copper wire. Based on what I've said do you think the motor could be powerful enough to pull this scooter with someone standing on it at about 20 to 25mph? can this be done?

Topic by NoahW7   |  last reply