Non lethal poison blow darts???

Non lethal poison blow darts.? I was thinking about making blow darts then the topic struck me, could common natural non lethal poisons or toxins be used in blow darts. This sounds a bit vague, so heres and example: you take poison ivy leaves and either wipe the darts on the leaves or grind up the leaves then rub darts in the mix. Would this work, how effective would this be?. I am not planning on even attempting to try this, this is for informational purposes

Topic by HOMEPIE64 10 years ago  |  last reply 10 months ago


Site takes me to malware

I was interested in going to the site on the off grid solar panel that I recently got an email about. The reference take you to a malware site

Topic by richardnml 10 months ago  |  last reply 10 months ago


What's Inside an Instructables Prize Pack?

For a while, I wondered what was inside an Instructables prize pack. Now that I've gotten one, I decided to post the contents so that others know. An Instructables t-shirt (you can choose the size)A notebookA cardA tattooA pin2 stickers, one large and one small and roundAlso, a huge thank you to the Instructables team for organizing contests! YAY!

Topic by ProfessorPi 11 months ago  |  last reply 10 months ago


Black Ops II - K'NEX Weapon Versions "Wanted"

Hey Guys. Well, Black Ops 2 is a pretty sweet game, and I am sure you already know this. The thing you may not know is that many people, including me, would like to see K'NEX versions of those guns included in the game (and trust me, I plan on building some of these...). So without further adieu, I present to you pics of the Assult Rifles, LMGs (Light Machine Guns), Shotguns, Pistols, Shotguns, Sniper Rifles, and SMGs (Sub-Machine Guns) of Black Ops 2 (see names below). Assault Rifles (pics 2 - 8): 2) TYPE 25 3) AN-94 4) FAL-OSW 5) M8A1 6) M27 7) MTAR/FLATTOP TAR 8) SMR Light Machine Guns (pics 9 - 12): 9) QBB-LSW 10) HAMR 11) LSAT 12) MK-48 Pistols (pics 13 - 16): 13) Five-Seven 14) B23R 15) Exicutioner 16) TAC-45 Shotguns (pics 17 - 20): 17) S12 18) KSG 19) M1216 20) R870 Sniper Rifles (pics 21 - 23): 21) SVU-AS 22) Balista 23) DSR-50 Sub-Machine Guns (pics 24 - 29): 24) PDW-57 25) Chicom CQB 26) MP7 27) MSMC 28) Vector K10 Some of these guns seem pretty impractical, but they will be cool none-the-less. Lets get building. =D -The Red Book of Westmarch

Topic by The Red Book of Westmarch 6 years ago  |  last reply 10 months ago


Arduino color sensor 34725

I was using color sensor 34725 with arduino to detect colors but it seems it is working a bit strange i have uploaded the picture of the data i gather from my experiment here are the confusing things1.why green value is also high when i place sensor on blue paper?2.why green and red color are significantly more in yellow as compared when they are place on their own color.and so on, i mean the color sensor does not seem to work properly

Topic by DabuHackker 10 months ago


Can't access new mails in inbox or reply to messages

My inbox shows new messages but I can't access them and they do not show in my message list. I tried to reply to an old message as a test and could not do that either. I tried both IE and Chrome. any suggestions?

Topic by Mr. E 10 months ago  |  last reply 10 months ago


Create a phone shell/frame/body?

Hello all,The new phones these days break too easily and its harder and harder to replace the battery or sim card. Instead of buying or making a case, my idea is to make a phone shell/frame/body with a 3d printer, and just taking the parts out of my Samsung and just putting it into that.Is it doable?

Topic by frostieff 11 months ago  |  last reply 10 months ago


How images for website on raspberry

I create a page for managing raspberries, but I can not add a picture of what I'm doing wrong.how to set the path to the picture in the index.html or how to open access to system folders in raspberry

Topic by АлексндрЛ 1 year ago  |  last reply 10 months ago


how can i make a toy plasma thruster that actually works???

I'd like to know how to make a plasma thruster like the one on that one youtube video. If you know how, or you were the one who put up that video, please put up an instructable on it and send me the link. You can reply to this post on my orangeboard on my profile, thanks...Youtube video: Plasma thruster:http://youtube.com/watch?v=s_wwEKp6SGk

Topic by nathanzhang 11 years ago  |  last reply 10 months ago


DIY Costume Mute Rainbow 6 siege

My son wants to construct a costume for Halloween: Mute from Rainbow 6 Seige. Some of the costume items are easy like Cargo pants, ski goggles, combat boots, etc. Do any of you have suggestions for the gas mask, tactical vest and details. Thanks for any suggestions :-)

Topic by Kathmandu365 1 year ago  |  last reply 10 months ago


Staining a paper straw hat

Hi all. I was recently returned a hat I bought for my ex, it was one of those "I'd like that" moments where I spent a few pounds on something that she changed her mind about before it arrived and has never been worn since, it's not a particularly expensive hat but it is a unisex style essentially just a white straw cowboy style hat in fact I have a similar one in brown. Not being a great lover of white hats I would like to stain it a different colour but as I have never stained paper straw I have no real idea of how best to begin. Suggestions from anyone with experience of this material would be very welcome. Thanks in advance. NG.

Topic by Nostalgic Guy 3 years ago  |  last reply 10 months ago


adding photos to instructable

 i have been writing instructables for a while.. suddenly when i go to add a photos to a new instructable the ... 1) select add 2) select photos and immediately the window appears and cascades down my screen... it has the  browse button at the bottom left corner trouble is now the bottom edge of that window has taken to cascading down to below the bottom edge of my screen so i cant access the browse button..??? i cant drag that box .. nothing i seem to able to do - even moving the task bar will bring it back in to view???  how do i add photos now?

Topic by agatornz 2 years ago  |  last reply 10 months ago


Delta robot programming help

I recently created a delta robot with 3 rc servos and controlled with the arduino duemilanove. i was easilly able to create pre-programmed movements and get it to do simple repetitive tasks. but i would like to controll it with a joystic type controller(shown i pitcures) it has a 2 axis joystick and a single linear pot.i would like to use the joystick to control the x and y axis(foreward-backward,left-right) and use the linear pot to control up and down. the problem is is that the robot has all three axis on the same plane. so i need help trying to convert thes 3 seperate axis to controlling 3 planar axis. any help would be apreciated. thankshttp://www.youtube.com/watch?v=J579XB_JISQhttp://www.youtube.com/watch?v=J579XB_JISQ

Topic by budsiskos 9 years ago  |  last reply 10 months ago


Pov display with arduino

I was making pov display with 10 leds using arduinobut it seems it is not working as it shouldhere is the codehttps://hastebin.com/etovafuvab.cppi would appreciate an kind of help

Topic by DabuHackker 10 months ago


Knex Combat/War Worthy Shotgun - A Tribute

Hello everyone,  So, out of the blue I decided to take a walk down memory lane and watch some old K'nex gun videos on YouTube. After some time, I came across a video from several years ago. I'll link the original below, but basically it was a video by KILLERK about wanting to build a more war-worthy shotgun. There were a couple of these videos where he basically talked about what he wanted to have on this gun. At the time, I didn't see a video or any post on a finish product, so I decided to build it myself based upon his wants.  Note this gun is unfinished as I just wanted to show it off. However, it will be completely finished, and if there is a demand I will make instructions for it. The following are the guns features, along with its characteristics: -Pin guide -Charging bolt -Straight-pullback rolling trigger -Comfy stock -Comfy handle -Trigger guard -Finger separator  -Sturdy construction -No broken parts (None are required)  -Good ergonomics -Looks nice/clean -Shotgun turret, with KILLERK's shells -Because of the design, trigger strength, and shell design, the gun is very powerful -Good spread of bullets, thanks to the shell Now for something a little more personal. Personally,I think it is the best gun I have ever made. I wanted to make one last gun that revived old concepts as sort of a thank you to the community that I've been on since 2011. This community has been a considerable part of my life, as I used to spend a lot of timing playing with these plastic toys. With leaving for college in a month, I don't see myself really building anymore, not to mention posting anything new. The post I make for this gun will be my last K'nex related post. However, like most, I'll still lurk around.  KILLERK's video Thank you to all.  -Didexo

Topic by didexo 1 year ago  |  last reply 10 months ago


Irritating Site PopUps

I quite like getting notiification emails and I often like to check out the featured article on the web pages but I sure as heck get extremely irritated that the popups appear so quickly and cover so much of the page that it interferes with my reading of the article. Can these be turned off/delayed? I understand the desire to market the tutorials to interested people but this is just darned irritating. BTW - this comment page hung for ages because of Google analytics - not very user friendly.

Topic by bnnorman 2 years ago  |  last reply 10 months ago


Solar - PV versus Solar Oven with Peltier

I was browsing the site as I am often wont to do, and spent quite some time revisiting old 'ibles covering various solar projects, almost all of which are heat related. I understand from general consensus that PV (photo voltaic) solar systems are very inefficient and one of the worst ways to harvest solar energy (when considering the cost of construction and the energy transfer capacity, etc.) Almost everyone who knows what they are doing suggest that the best (and easiest) way to harvest solar energy is to collect the heat - be it to heat air or water, cook food, or other such purposes.Now, I have recently been fascinated by a discovery relatively new to me, peltier units. These devices, for those who don't know, can work in one of three ways. They can harvest and/or produce either heat, cold, or electricity.Basically, if an electric current is run through a unit, it produces heat on one side and an equal amount of 'cold' on the other. Yes I know you can't produce cold - but for the layman, that is what we call it.Or, if one side is heated while the other side is cooled, the unit produces an amount of electricity from the difference in temperatures. One example I have seen and plan to make use of is in vehicles - if you place one or more of these on your exhaust manifold, or any other location where the engine produces waste heat, and airflow can reach it to cool the other side, you generate electricity from the waste heat energy that would otherwise just be . . . well, wasted.But it occurred to me today, if you had a unit attached in the middle of a solar collector, focusing sunlight on one side of the peltier unit, and isolate the other side of the unit in some cooling medium (perhaps even just air with a heat sink of some sort - more likely a cooling liquid though), how effective would this be at harvesting solar energy (heat) into electricity?Actually, I have been using the more common name of peltier, but I believe that for this application a seebeck unit (which is nearly the same, but different) would be required. As I understand it, Peltier units are used more as coolers and are almost always constructed with Bismuth Telluride (Bi2Te3) and used around room temperature and below; while Seebeck units are good for power generators are often constructed of PbTe or, SiGe as well as Bi2Te3 and are used at much higher temperatures.From http://en.wikipedia.org/wiki/Thermoelectric_effect :The effect is that a voltage, the thermoelectric EMF, is created in the presence of a temperature difference between two different metals or semiconductors. This causes a continuous current to flow in the conductors if they form a complete loop. The voltage created is of the order of several microvolts per degree difference.((more info can be found at the referenced wiki page on formulae etc.))Just curious on if this would ever be a decent way to harvest solar energy into electricity. I have also thought up using a thermal siphon solar heating system in which the liquid flows past one or more water wheels which power a small (and obviously slow) generator - but at that point I believe it would be so inefficient and limited in use as to just have absolutely no practical application. The peltier unit (used as a seebeck unit) would probably do better, but I am not certain, which is why I post the question.

Topic by karossii 11 years ago  |  last reply 10 months ago


How Can I Fix Bar Clamps that are Slipping?

⁽ᴿᵉᵖᵒˢᵗᶦᶰᵍ ᵗʰᶦˢ ʰᵉʳᵉ, ˢᶦᶰᶜᵉ ᴵ ᵍᵒᵗ ᶰᵒ ʳᵉᵖᶫᶦᵉˢ ᶦᶰ ᵗʰᵉ ᴬᶰˢʷᵉʳˢ ˢᵉᶜᵗᶦᵒᶰ⋅⋅⋅⁾ I just found an antique bar clamp (An ELZETT, a bit smaller than that one though). I've removed most of the rust, but: The sliding jaw doesn't lock onto the bar when I tighten the clamp. It looks like The notches were very shallow/small, to begin with, and they've worn out quite a bit. I tried enlarging the grooves/notches that were on the bar with a hacksaw, but that didn't really help. Does anyone have an idea for making it lock/catch on the bar? My grandpa might have several more of these clamps, and I don't want them to go to waste! Drilling holes into the bar and adding a removable pin - no, because this steel is really hard and I'd go through 10 drill bits! How about building some type of wooden cage around it that will hold it in place? The only thing I can think of is to take it apart, and use the hardware for a homemade wooden clamp. But I think it would be easier to start from scratch... I really want to fix this clamp! The quality of old tools, throat depth of this clamp, the screw, the swiveling pad - I need these! Thanks!

Topic by Yonatan24 1 year ago  |  last reply 10 months ago


I just don't see some of the data.

I manage MySQL databases. And this was not difficult before. But now I tried many thoughts and ideas how to solve the complexity, but didn't correct the problem. I can't access the amount of data due to the complexity of the program. And I can't understand what to do about it.

Topic by TaylorHaynes 11 months ago  |  last reply 11 months ago


please help!! my dog stepped on a pice of duct tape and now it is adhered to her paw see message for more info!!

ok my dog stepped on a piece of duct tape and it is now adhered to her paw pad as well as her paw hair i have tried to dissolve the adhesive with rubbing alcohol but want to know if anyone has any other ideas you see i cannot just rip it off since that would really hurt her so i really need some advice please help, fidgety2

Topic by fidgety2 8 years ago  |  last reply 11 months ago


KNEX MechWarrior Series PDF's

I was too lazy to dig out the instructions to make the MechWarrior line of KNEX and went looking for the pdfs. I couldn't find them any where online, so I dug them out and made pdfs to share with everyone who missed out on the line, lost the instructions or like me is too lazy to find the instructions. I'll upload as many of the pdfs as I can here; the rest are at this link: http://www.4shared.com/u/KpLjxBMX/clanknexer.html You have to make a free account to download them (UPDATE:  you don't need to make an account to download), but it's worth it. If you have a better website to share these files, please let me know. The pdfs include: The Cauldron Born & Owens The Mad Cat & Avatar The Shadow Cat and Sunder Series 1 Firefly Uziel Vulture Series 2 Hollander II Thor Uller Series 3 Converted MiningMech Legionnaire I am missing the Black Hawk (which i seem to have lost) from series 3 and the entire line of electronic armor (series 4) which includes the Fire Starter, Catapult and the Converted ConstructionMech. If anybody has a pdf of them or willing to sell them please let me know!

Topic by clanknexer 6 years ago  |  last reply 11 months ago


Transformers connected in reverse

Hi can a transformer connected in reverse. if 230v to 12v transformer is connected in reverse,. will it generate around 230v Just some silly doubt. Actually i was trying to find a step up transformer.. which converts 6v to 24v. what exactly its called.

Topic by nominds 9 years ago  |  last reply 11 months ago


Pro membership

Hey! If any one of you wants a pro membership. Please tell me . It is first come first serve policy as I have only 1 left. Goodluck

Topic by pranjal12 6 years ago  |  last reply 11 months ago


Dogwoods

Hi, I purchased a few dogwoods, pink and white ones, the tags fell down from the pot and now I don't know who is who. There is any way to identify which one is the white one and which one is the pink one? They are around 12"

Topic by Dalida1980 11 months ago


FoodSaver Quick Start V825/V845/Game Saver Sport Vacuum Sealer.

We have an FoodDSaver QuickStart V825/845 Game Saver Sport vacuum sealer that will suck the air out but will not seal. I was wondering if it could be the heating element gone bad???? Tell me how to check it and how to fix it. Thanks in advance. My email is; fed1@farmerstel.com.

Topic by DilmosJ 11 months ago  |  last reply 11 months ago


I want a special rc tank

Hi, We wanted to design circuit board. The Circuit board size 92mm x 42mm. This circuit board is for small RC Tank with two wheels which has two motors. This tank is for indoor usages. RC tank properties; a) Image transfer operation with 5g wifi and android hand terminal b)take picture recording c)2.4 g remote control (left, right, forward, backward) d)voice comunication single side e)Industrial tablet; android operating system support with remote control visual comminication. sample applications; https://tr.aliexpress.com/item/Free-Shipping-iPhone-iOS-WiFi-RC-i-Spy-Tank-w-Live-Video-Camera-Functions/736018599.html https://tr.aliexpress.com/item/2018-end-striyel-bilgisayar-Tablet-PC-Mobil-Bilgisayar-Sa-lam-Su-Ge-irmez-Darbeye-Windows-10/32854862418.html?ws_ab_test=searchweb0_0%2Csearchweb201602_3_10152_10151_10065_10344_10068_10342_10343_10340_10341_10696_10084_5722520_10083_10618_10307_10059_5722620_5722920_5722720_5722820_100031_10103_10624_10623_10622_10621_10620-normal#cfs,searchweb201603_1,ppcSwitch_5&algo_expid=6f402017-0dcb-44ff-aa1b-8ba773277605-6&algo_pvid=6f402017-0dcb-44ff-aa1b-8ba773277605&priceBeautifyAB=0 https://tr.aliexpress.com/item/China-brand-IP67-Original-induction-Rugged-Android-tablet-PCs-phones-8-8-inch-GNSS-Surveying-GPS/32641617522.html?scm=1007.13339.90158.0&scm_id=1007.13339.90158.0&scm-url=1007.13339.90158.0&pvid=880689b3-adb4-4dab-a184-0d3e3a0bcb30&_t=pvid%3A880689b3-adb4-4dab-a184-0d3e3a0bcb30%2Cscm-url%3A1007.13339.90158.0

Topic by Alpaslankilickaya 11 months ago  |  last reply 11 months ago


Technology Category: Artificial Intelligence/ Machine Learning/ Data Science

I would like to see AI/ Machine Learning/ Data Science be a Subcategory in the Technology Category on Instructables. The field of Data Science/ Machine Learning is on the rise. Machine Learning is being integrated into various products & services we use on a daily basis. Below is the Developer Roles chart from the Stack Overflow Developer Survey 2017; It shows that the field of Data Science & Machine Learning combined accounts for approximately 12% of those surveyed, compared to the combined 1.6% in 2016. A large number of Open Source Machine Learning libraries like TensorFlow, SciKit, etc have been made available to developers across the world. These libraries enable developers & engineers to integrate ML models, Computer Vision, Chat Bots, Speech & Text recognition, etc into their projects. The Google Assistant & Amazon Alexa AI both AI Assistants are now compatible with the Raspberry Pi. Android Things - An OS built for connected embedded systems which can run ML & AI programs is now compatible with Hardware Platforms like the Intel Edison/ Joule & the Raspberry Pi. Platforms such as OpenAI conduct fundamental research & provide free software for training, benchmarking & testing AI. Kaggle - a website for hosting Data Science Competitions has a large collection of high-quality public datasets. There are many other platforms & frameworks like these. With the growing number of resources being made available in these fields, it is only natural that a large number of people will be looking for tutorials & instructions to help them integrate these resources into their projects. Instructables could become the repository of ML/AI based projects. E.g: AI-based Security System, a Line following robot which uses ML algorithms to follow the line, etc. I hope we can have a constructive discussion in the comments as to how we the Instructables Community can make Instructables the best repository for AI/ML projects.

Topic by Jonathanrjpereira 1 year ago  |  last reply 11 months ago


No option to make comment appear at top and setting promoted items does not work

I have a couple problems: 1. No option to make comment appear at top. There used to be a little checkbox saying if you want your comment of your instructable to appear on top. Now, I don't see one. 2. Setting promoted items does not work. Whenever I set promoted items, it just says 'saving..' and does nothing Also while i am at it. Instructables needs a undo and redo button. ctrl-z removes paragraphs, not characters, ctrl-y does nothing. I have had to redo paragraphs because ctrl-z messed it up. Also, i don't want carriage returns to be deleted in my intructables. I am using windows 7 and chrome. Instructables is honestly the buggiest website I have ever seen.

Topic by xp4xbox 2 years ago  |  last reply 11 months ago


"Set Promoted Items" still not working

Latest Firefox in Windows 10. "Set Promoted Items," after being totally nonfunctional when the new profile pages launched (I could click the button but the pop-up window would just show the 5 items that were already there, not give me an option to change them), still isn't working for me. It lets me drag and drop to rearrange the items but then when I hit "Save" it just gets stuck on "Saving...". It's been like that for at least 10 minutes now. I think I read in another post somewhere that it could take an abnormally long time, but it seems like that should be resolved by now.

Topic by Ben Finio 2 years ago  |  last reply 11 months ago


Set Promoted Items Saving Not Saving

After rearranging the items for "set promoted items" and then pressing Save, "saving" occurs to which occurs for an infinite amount of time ie it does not appear to work. Best wishes and all, thx. 

Topic by TVMiller 2 years ago  |  last reply 11 months ago


Help me design a table like this?

I have long dreamed of building a capstan table for my home like DB Fletcher's beautiful designs (google it if you aren't familiar). I have researched various jupe tables and similar expanding round tables with none that satisfied me - either they were designs I was afraid to try and recreate then build, or the product was not what I wanted for my home.But I now have found a very satisfactory compromise; something I feel is possible for me to design and build myself, and which would look great in my home.I just don't have enough time in the day to do all of my projects... so I am hoping to find some collaborators here who will contribute time to help me design a knock-off of this table. Here's a link to an swf demonstration of the table in action... http://ashleighengineeringservices.co.uk/sei/s/3786/fe2146247.swfSo... who wants to help me out?

Topic by karossii 9 years ago  |  last reply 11 months ago


Windows 9x Clouds Remake

After searching and searching the internet, I could not find one single remake of Microsoft's signature wallpaper, "Clouds". So I set off to make one. The original picture was a 1024x768 grainy JPEG file. It was included in both Windows 95 and Windows 98 as selectable wallpapers, and it was the background found in the cover art of both releases of Windows 9x. My remake is a 1680x1050 PNG which I made fully from scratch, using Microsoft's Clouds.jpg as reference. Here on Instructables I have included my remake, as well as Microsoft's original. Deviant Art My Blog

Topic by Arbitror 8 years ago  |  last reply 11 months ago


Will it work if I use a guitar in the microphone input

Sorry, can't really think straight today I'm just wondering if I got an adapter for a standard guitar cable to fit the microphone input in my sound card, would it would it work as a microphone and record off my humbuckers?

Topic by Chicken2209 10 years ago  |  last reply 11 months ago


bone-phone

How would you make this?

Topic by plotseling 10 years ago  |  last reply 11 months ago


Building Touch Sensors from Scratch?

I am very familiar with velostat and conductive fabric and how to combine them to make textile touch sensors. I would now like to make a touch sensor that's more solid, and made from a firmer resistive substance than velostat. I've been looking up the resistivity/conductivity of different metals here: https://www.thoughtco.com/table-of-electrical-resi.... In theory, as long as one metal (or other material) is more conductive than the other, it should work the same? I've read on silicon and carbon fiber, but I'm not sure if what I'm researching is the solid kind, or the flimsy/squishy/bendy kind.

Topic by LeAnne_K 11 months ago  |  last reply 11 months ago


I get the message "replace the emergency stop switch" in my treadmill.

Hi. The treadmill is a Life Fitness T7. I would really appreciate any help on how to solve this problem.Thank you very much in advance.

Topic by Desgrac 11 months ago  |  last reply 11 months ago


Gap measurement using a sensor

I want to measure a very tiny gap of about 20-30 microns(0.02-0.03 mm) using a sensor with the help of arduino and then display it using a 16x2 Digital LCD Display. Can someone help me out with the sensor that I will need for this purpose with exact name and its working.The gap that I want to measure is the gap between the the joints of a healing fractured bone.(the joint where the tissues develop to join the broken parts together.)Since this is a leg bone any person walking with such a fractured bone will put pressure on the bone and the gap present in the bone will reduce. So that is what I want to measure using a sensor and arduino. Since this gap will be too small (20-30 microns) I am unable to find a suitable sensor for the same.PS: Main issue I am facing is the measurement of gap using a sensor and arduino since I can find a suitable sensor for the same.Please find the attachments of the bone and the gap I want to measure.Also the thing I am doing is a close case of greenstick fracture. refer to the attachment of greenstick fracture.

Topic by ChinmayV2 11 months ago


Arduino-Based Solar Heater for My Above Ground Pool

A few weeks ago I grabbed the garden hose to top off the pool and noticed how hot the water was as it came out. (the hose had been lying in the sun). So, I decided to put it to good use. We've been looking at solar heaters for the pool but found the prices prohibitive, and being a DIY'er I decided to build my own. I have 50' of black, tangle-free hose coiled on a 2' by 4' piece of Wolmanized, 3/4" plywood. This is perched on top of an 8' 4by4 post which I sunk into the ground near the pool's filter. To feed the hose I installed a faucet in the filter's return line which is under sufficient pressure to travel up and into the hose. The other end comes down to an electric valve before emptying back into the pool. The Arduino portion of the project consists of an Arduino Uno board, a DS18B20 temperature sensor probe, a 12-volt, 3-amp power supply, A small prototype board that holds two 12-volt relays and two 2N3904 transistors which the Arduino triggers, two 12-volt car-type relays which are triggered by the smaller ones, and a Mallory Sonalert. My idea was to have the Arduino monitor the temperature in the return line from the solar hose coil, and when it reaches 80 degrees F, the Sonalert goes off for 5 seconds to warn swimmers that hot water will be coming out of the return spout in the pool. And after the warning sounds, the electric valve then opens for 2 minutes, flushing the warmed water into the pool. Since the system is driven by the pool's filter, the solar hose is replenished during this flush period, and when the valve closes, that new water is then heated, and the whole process starts over. The Arduino code consists of a couple libraries to incorporate and read the temp' probe's output, a subroutine which tests both the Sonalert and the valve when the system is first plugged in, and then the necessary code in the Void Loop section which simply waits for the temp' to reach a preset level and then sound the alert and then open the valve.The system is built into an 8" by 6" electrical box that mounts on the 4 by 4 post just under the solar hose panel.The systems been up and running for about a week now and I've averaged about a 2 degree rise in the pool's water temp' per day.If anyone is interested in seeing photos of the project, or the Arduino code, I'll be happy to provide. UPDATE: Here are some phots of the project...

Topic by bnelson218 11 months ago  |  last reply 11 months ago


14-16V to 12V stable 20A max

Hi,I am looking at stepping down from (14 to 16V) to 12V drawing at max 20Ais there any efficient way to do so in a very very small package?Thank you

Topic by garnio 11 months ago  |  last reply 11 months ago


Best vedio game

What do you think is the best video game in the world? What console do you think is the best? 

Topic by XxsonicxX 7 years ago  |  last reply 11 months ago


Smurfs (bizarre)

When I take a holiday in Wales we always listen to "The Smurfs" (Father Abraham in Smurfland) - it's a tradition. Hence the phrase "The Smurfs have finished" meaning "Someone change the record". If you've not been exposed to this yet, see here: Then there's "Smurfing beer" - quote: "you don't get drunk and it isn't dear" (It isn't beer) www.youtube.com/watch The Pinoccio song questions - quote "Pinoccio, Pinoccio, why are you made of wood?" www.youtube.com/watch The annoying but up-beat Dippety-Do song: www.youtube.com/watch Looking at the album cover I wonder exactly what happens when the floating-head of Father Abraham appears in Smurfland - do they panic and start singing lest he smite them? (Notice the bad image job where the top of a mushroom-house has been cropped off on the right)

Topic by lemonie 9 years ago  |  last reply 11 months ago


Can see instructables on phone but not on computer

I can get the instructable topics on my phone, but not on my computer. How do I fix this?

Topic by porscheman1 11 months ago  |  last reply 11 months ago


Problems entering a contest

Hello,I have noticed some time ago that when I enter an Instructable into a contest it doesn't work the first time and the instructable isn't listed as an entry even after a few days. I always had to re-enter and then it worked. Now it just doesn't work and that's it. I've entered my latest instructable three times between yesterday and today and nothing. I tried the fourth time now but I wanted to mention this already because there seems to be a problem. My instructable matches the topic 100% so I don't think it has been refused as an entry.

Topic by Creative Mom CZ 1 year ago  |  last reply 11 months ago


I need to quickly correct this failure.

One of my important projects suddenly stopped opening in the Project. I stopped accessing it, and it all complicated me a lot. I can’t imagine how this could happen.

Topic by JodieSaunders 11 months ago  |  last reply 11 months ago


Periodic table of condiments

Nope, that isn't a typo. You've heard of the periodic table of elements? Well, check out this hilarious table of condiments that periodically go bad. From Condiment No. 1 (Mayonnaise, which the table says goes bad in 3 months) to Condiment No. 75 (Maraschino, which apparently never goes bad), you can look up just about any condiment you can name to see when you need to toss it out. Or at least when these people think it goes bad.Take it with a grain of salt (Condiment No. 2, it never goes bad!) though-it claims Lemon goes bad in 2 months. Stuff and nonsense. I've eaten 3 month old lemons that were perfectly good.Mendeleev would be so proud...

Topic by Lithium Rain 10 years ago  |  last reply 11 months ago


Broken Portable LCD Screen

Hello everyone... I have a broken LCD screen that went to a dvd player base that was a portable dvd player system, I was wanting to know if it was possible for me to find a way to power this up and use it with my computer, to display system stats like temp, proccessor usage, and things like this, any ideas on if this can be done and how I could do it?

Topic by blumoon94 8 years ago  |  last reply 11 months ago


Arduino heating controller: solar panel, oil burner, stove. NEED HELP AND ADVICE

HI this is my first time with arduino and electronics so please be forgiving.i want to make a controller for my home heating system and if it possible be able to control (change temp. setting, see statistic, etc. by phone - Bluetooth).so, i have three source of heat: solar panels (water), oil burner, wet stove. first part of plan is to connect all electrical components correctly (to make sure nothing blowup), second step is the program. third connect controller with phone by android or have a option to send sms to turn on/off oil burner.let's startthe heating system should looks like that (photo attach)please don't focus on the plumbing (that's only sketch), electronic and programing is more important.program (second step) should do:1. if T5 >T2 pomp P2 work 2. if T3>55'C , P3 work but only if O1 is switch off (automatically P1 and M1 is off, because they will be connect directly to O1 power) 3. option to on/off O1 by click on the phone (or by modul GSM in the future e.g sim800L) 4. additionally options 2 and 3 they are conditioned by other sub-option of 5 zones (where hot waterwill flow, so what will be heat): a)olny hot water in the tank- M3 open, b)only underfoor h.- M2 open, c)only radiators- M4 open, d) all heating, no tank- M2 i M3 open, e) all M2 M3 M4 open. so, before turn on O1 start making fire T3, one of the zone have to be pre-sellect.also if T1 >60st.C (and O1 and P3 are off), P4 will turn on (dump extra hot water to underfloor h.).that's all, nothing more .... but it's to much complicate for me right now. :smiley-confuse: and third part: all should be controll by simple phone app (android) e.g. turn on/off oil burner (maybe timer), change temp. in tank, change zone, see statistics etc.thera are elements what i have already- arduino nano-logging data module-relay 8 ports-bluetooth modul At-09, ble-4.0-extension board nano v3.0- temp. sensors DS18B20 i connect everything by all info what i've found in internet. also i tried to do simulation in THINKERCAD but many of my elements are not exist in the program, stiil no win. i didnt want to connect power just in case of blow off :o this is what i already found online:http://www.reuk.co.uk/wordpress/arduino-solar-water-heating-pump-controller-design-and-code/https://thesolaruniverse.wordpress.com/2016/11/21/monitoring-temperatures-in-floor-heating-loops-with-an-arduino-with-data-display-on-a-3-5-tft-screen/http://house4u.com.ua/articles/solar-controller/en/part11.phphttps://www.instructables.com/id/2nd-Gen-Arduino-Hot-Water-Solar-Collector-Controll/https://forum.arduino.cc/index.php?topic=70048.0and about bluetoothhttps://arduino.stackexchange.com/questions/19517/hc-05-bluetooth-module-inq-command-doesnt-worki only showing the links to proof my hour's spend in google.i think first two are the best.so i put together all what i found and this is my first program:const int TANKSENSORT1 = A0; const int TANKSENSORT2 = A1; const int PANELSENSORT5 = A2; const int STOVESENSORT3 = A3; const int FLOORSENSORT4 = A4;const int RELAYO1 = 3; const int RELAYM2 = 4; const int RELAYM3 = 5; const int RELAYM4 = 6; const int POMP2 = 7; const int POMP3 = 8; const int POMP4 = 9;const int diffON = 6; const int diffOFF = 3;void setup(){ Serial.begin(9600);pinMode(PANELSENSORT5, INPUT); pinMode(TANKSENSORT1, INPUT); pinMode(TANKSENSORT2, INPUT); pinMode(STOVESENSORT3, INPUT); pinMode(FLOORSENSORT4, INPUT);pinMode(RELAYO1, OUTPUT); digitalWrite(RELAYO1, LOW); pinMode(RELAYM2, OUTPUT); digitalWrite(RELAYM2, LOW); pinMode(RELAYM3, OUTPUT); digitalWrite(RELAYM3, LOW); pinMode(RELAYM4, OUTPUT); digitalWrite(RELAYM4, LOW); pinMode(POMP2, OUTPUT); digitalWrite(POMP2, LOW); pinMode(POMP3, OUTPUT); digitalWrite(POMP3, LOW); pinMode(POMP4, OUTPUT); digitalWrite(POMP4, LOW);}void loop(){ float solarPanelTemperature = ((analogRead(PANELSENSORT5) / 1024.0) * 5000)/10; float hotWaterTankTemperature = ((analogRead(TANKSENSORT2) / 1024.0) * 5000)/10; if(solarPanelTemperature > (hotWaterTankTemperature + diffON)){ digitalWrite(POMP2, HIGH); do{ delay(250); solarPanelTemperature = ((analogRead(PANELSENSORT5) / 1024.0) * 5000)/10; hotWaterTankTemperature = ((analogRead(TANKSENSORT2) / 1024.0) * 5000)/10; }while(solarPanelTemperature > (hotWaterTankTemperature + diffOFF)); digitalWrite(POMP2, LOW);float stoveTemperature = ((analogRead(STOVESENSORT3) / 1024.0) * 5000)/10; if(stoveTemperature > 55){ digitalWrite(POMP3, HIGH); do{ delay(250); stoveTemperature = ((analogRead(STOVESENSORT3) / 1024.0) * 5000)/10; }while(stoveTemperature < (55)); digitalWrite(POMP3, LOW); // musi byc dodane autoamtyczne wylaczenie pieca O1 jesli T3>55, a jesli T3<55 piec moze byc wlaczonyfloat hotwaterTemperature = ((analogRead(TANKSENSORT1) / 1024.0) * 5000)/10; if(hotwaterTemperature > (60)){ digitalWrite(POMP4, HIGH); do{ delay(250); hotwaterTemperature = ((analogRead(TANKSENSORT1) / 1024.0) * 5000)/10; }while(hotwaterTemperature < (60)); digitalWrite(POMP4, LOW); // still system have to be sure that O1 or stove P3 not working. // if one of those is on (O1 or P3) 'heat dumping' options cant start// still missing: // bluetooth modul // or logging data modul (statistics) // before heating will be on one of the zones have to be setup.(and save) // 'life' option for changing the zones M2, M3, M4 } delay(250); }and i stuck again.i'm looking for advise about proper electronic setup and program the arduino. i believe there are many people like me looking for help, so this post will have a bigger impact.regards

Topic by eukaliptus 11 months ago  |  last reply 11 months ago


​Make an optic close focus.

I want to be able to put my night vision monocular in front of my 2x scope on my airsoft.I need a combination of lenses to put between my scope and the NV to let the scope focus at a couple of inches (instead of 30 feet), and reduce magnification because otherwise I’d just be looking at a tiny part of the phosphor screen heavily magnified.I know it’s possible because a commercial unit is available, I just don’t know if it’s feasible for a guy like me (doesn't have a degree in optics) to build (I'm thinking no, but I figured I'd ask).Thanks for any help you can offer.

Topic by instrucables360 11 months ago  |  last reply 11 months ago


Exploding K-cups in a Keurig coffeemaker

Our Keurig coffeemaker is several years old. We began to see a ragged star opening in the top of the K-cups after brewing and coffee grounds various places outside the K-cup. All of the usual recommended fixes were no help. (See below.) This video gave me a solution that worked very well for us. (I have no personal connection to the video or its maker.) We now see only a neat round hole in the top of our K-cups after brewing, not a torn and ragged opening. Video summary: Remove two screws under the flip-up cover above the K-cup holder. Remove the decorative plastic cover by tugging at it. Snip the zip tie that keeps the soft white tube on the fitting. Pull the tube from the fitting. Hold the end of the tube over a cup. Cycle water through the Keurig until several cups come out clean. Clear the upper and lower needles of coffee grounds. Attach the tube with a new zip tie and screw the cover back in place. One word of caution: Very hot water spewed onto the soft skin at the base of my thumb and it was very uncomfortable. I draped a folded towel over my hand while hot water was being expelled from the disconnected tube at the top of the Keurig. Also, I ran quite a number of cups of water through the Keurig until I got three consecutive cups of water without any debris particles of any kind in the water. (I did not see an accumulation of coffee grounds like the man describes in the video, but I saw what was similar to pieces of a brown wing from a housefly.) In the two or three days following the procedure in the video we did occasionally have a K-cup blowout, but have seen only perfect round holes after a week or so, and we probably brew a dozen cups of coffee each day. The usual recommendations-- +Keurig's official recommendation as the cause of grounds migrating outside the K-cup is too much air inside the K-cup as evidenced by a domed lid on the K-cup before it is punctured. Their recommendation is to poke the top of the K-cup with a pin before putting it into the Keurig. Because of my observations and experience, I give very little credence to this. +Accumulated lime from the water needs to be descaled from the inside of the Keurig. Lime accumulation does cause a partially full cup of brewed coffee. We regularly descale our machine. We have also run water through our machine whenever we have seen grounds in our coffee and some grounds came out with the water. Descaling is a good thing to do, but I doubt it has a connection to bursting K-cups and grounds where they do not belong.  +Clogged upper and lower needles. The video will direct you to use a wire to insure open passageways inside the needles above and below the K-cup.

Topic by Phil B 1 year ago  |  last reply 11 months ago


Cree XB-D driver circuit

Hi Everyone,I would use following design with some modifications to be able to drive 3x3 Cree XB-D LEDs Green/Blue:https://www.instructables.com/id/Circuits-for-usin... Step 8 #4I would use 12V ATX computer PSU as voltage source.PWM source: Arduino nanoAttached picture show how I modified the design: 3x3 LED setupMy main concern, is it correct my calculation of LED currents: based on my understanding, 220mohm current sense resistor setup 2,272A current through FET. Based on Kirchhoff's current law, it will be 757mA for 1 LED.Is that correct?Any advise and suggestion would highly welcome.Thanks,Best Regards,Gyorgy

Topic by bernathg 11 months ago  |  last reply 11 months ago