Arduino Coder Needed - Will Pay

Hello,      I am in serious need of some help with code for a Arduino Uno project! This would not be for free of course. Just let me know what would be fair. So if your in the mood to help a dummy out, drop me a line! Here's some background on the project The project is a prop for a Halloween haunted house/escape room. The idea is for 4 RFID readers to detect 4 objects (Maybe optical sensors are better here for triggering the audio?not sure). Once all 4 objects are placed on top of each reader, the adafruit Wave Shield produces a telephone ring sound effect (I will be providing the sound .wav files to the adafruit SD card). I would also need to have a the ability to push a button to stop the ringing and skip to the next audio file on the SD card of the Adafruit wave shield. Hope that all made sense :). Below are links to all the pieces of hardware I am using: 1. Arduino Uno - I think you know what this is 2. 4 x RC522 RFID Readers  - http://www.robotshop.com/en/mifare-rc522-module-rfid-reader.html?gclid=CK7tv9qO384CFYGEaQodg8sGkA 3. Adafruit Wave Shield - https://www.adafruit.com/product/94 4. Maybe Photoresistors for triggering instead - https://www.adafruit.com/product/161

Topic by horizonfall   |  last reply


I published my Instructible too early. Can I still enter a new contest?

I published an Instructible and then two days later a new contest was posted that fits my project very well. Is it still possible to enter this new contest? It doesn't show up on my eligibility list.

Topic by DIYJRAY   |  last reply


Paracord braided horse halter

Hi, I have challenged myself to make a braided paracord halter and I need LOTS of help.  I found one online that I really like and would like to duplicate.  I purchased a book "How to Braid Quality Custom Tack", however the halters in this book are not quite what I want.  Hoping someone will be able to give me some pointers or tell me where to find the directions I need. The picture of the halter I have attached is what I want to make.  It appears to me that you would need to start with the nose band to make this work but none of the patterns I have found start that way. Help!!

Topic by Annie7753   |  last reply


old instructables website

Anyone want to see what instructables was like 10 years ago? https://web.archive.org/web/20051013063329/https://www.instructables.com/

Topic by bravoechonovember1   |  last reply


How do i stop emails from getting to my email from instructables?

I unsuscribed everything from the Email alert settings but i still get emails from instructables

Topic by GrandmasterFred   |  last reply


Tennis Project Collaboration

I roughed out a design (reversed engineered from various pictures) a tennis ball rebounder for a co-worker but it doesn’t look like he has the interest to build it anymore.  It’s a nice piece of equipment for anyone that likes to play tennis since you can set it up in driveway or basement.  Here are a couple of examples: Video 1 Video 2 I would like to do an instructables collaboration on the project with someone that would find this useful.  I would tweak the design (overall size, hardware, etc.) with your inputs.  Your responsibilities: Buy the materials which I’m estimating at less than $100.  Note that purchased versions cost up to $500. Build it - requires only a saw and drill Take a few pictures of the build and final product. Help with the documentation if needed  In the end, it is your rebounder to enjoy.  See my past instrucables for examples of my work/documentation. 

Topic by mtairymd   |  last reply


Instructable Editor repositions

I was editing an Instructable and accidentally hit a key near the home key on my keyboard. I had selected text, I think my shift key was still down and this happened to the editor: I had to save the Instructable, close the editor, and re-open the draft of the Instructable to fix the problem.

Topic by CommunityWorkshops   |  last reply


Vises, The Instructables' Newsletter, & Top 5's

This is a forum topic that I've been wanting to publish for the past week, but I wasn't able to because of a bug. 18 emails to service later, here I am: I recently published two Instructables: How to Make a Wooden 6" Bench-Vise, and Top 10 Vise Hacks!. After being featured in the newsletter, How to Make a Wooden 6" Bench-Vise got ~20K views, and Top 10 Vise Hacks. got ~50K views. Now that makes no sense (to me. Wouldn't someone that was interested in an Instructable about tips, tricks, and hacks for your vise wouldn't be interested in how to make a vise? 1.5X more? That makes no sense... (I would think that there would be a difference of 10-20%, but 200%?) Also, speaking of the newsletter, it would be awesome to receive an email at the end of the year, that shows the most viewed Instructables that were posted this year. This could be a nice feature... In my opinion, the thumbnail for How to Make a Wooden 6" Bench-Vise was taken on a white background and is really good, and the thumbnail for Top 10 Vise Hacks doesn't have text, and isn't very good. I think you'll agree with me on this... After the views from the newsletter had started to slow down to about 1000 every day, Top 10 Vise Hacks was featured again, in the "top 5 most viewed Instructables of the week" which has brought it to 98K views already. Does that mean that SO MANY people have missed it from the newsletter? That's also weird... Another thing is that my Instructable on How to Build a Wooden Drill-Press Vise has a fairly good thumbnail, and was put on the Homepage. However, my Instructable on How to Make a Wooden 6" Bench-Vise wasn't, while I think the thumbnail is WAAAY better.  What do you think? :)

Topic by Yonatan24   |  last reply


Problem with camera module

Hey guys, recently i brought a brushed motor quadcopter which came with a mini recording camera, i would like to connect it to my TS5823 32CH 200mW Video transmitter, but the camera don't have any wire that i can directly connect to my VTX, do anyone have any idea / schematic on how to connect the camera to my VTX ? Thanks a lot.

Topic by Sooncheng   |  last reply


Copy/Paste to Editor no longer works

I last published an Instructable the end of January.  That was my 28th.  I now want to publish another one but the capability to paste text copied from a document on my computer no longer works.  It flashes the text on the screen in the editor window but then disappears.  I write my Instructables using Microsoft Word 2007 with no fancy formatting.  I even tried copying and pasting plain text with the same results.  I am running Windows 10 and Internet Explorer 11.  The only difference in my setup and technique from January is an upgrade from Windows 7 to Windows 10.  I am not using the Edge browser. Oh, and just discovered that I have three drafts that I can't delete.  No amount of Google searching has provided an answer to that question either.  I guess I'll just have to quit sharing my expertise.

Topic by DELETED_boomer48 


what do you what me to do next ?

Do you want me to do craft , cooking and pets craft - rainbow loom -making stuff for dolls and things cooking -cakes , cupcakes ,biscuit or anything else sweet -pizza , pasta , or anything else savory pets -treats -toys

Topic by Mixey 101   |  last reply


Duct Tape Wallets

Talk about different methods of making them.

Topic by laxrulz16   |  last reply


Duct Tape Messenger Bag

Just in time for school ;)Duct Tape Nation

Topic by Mace42   |  last reply


Missing links in profiles

Hello everyone When I open any profiles, I only get the overview link at the left side, there used to be other links like followers etc. Is there a reason that they are gone? Or is it a bug? Kind regards Laurens

Topic by Laurens-Wuyts   |  last reply


Clay Contest Criteria

I have a question about the Clay contest criteria....debating whether to do an instructable for a DIY downdraft kiln vent for under $50 (cf $450-600 to buy) that I built. I've actually been waiting for the clay contest before publishing, however the contest criteria says:  "For the purpose of this contest, any project that uses a moldable, malleable, clay-like product will be eligible." So question is, would a kiln vent be eligible? Previous contest criteria has been "all things" related to said topic, but this seems more narrow in scope. Obviously a kiln vent is not made with clay, but it certainly fits the pottery topic. What to the contest gurus say?

Topic by craftycounterpart   |  last reply


I just got a comment on my instructable I posted not an hour ago that is apparently from 2 hours ago.

Here's a screenshot: http://image.prntscr.com/image/93b16b0471064f6691c839cba7d9a5e4.png This is the instructable: https://www.instructables.com/id/Cardboard-Book-Page-Holder/

Topic by nancyjohns   |  last reply


Which glue to create massage roller? How to do the seam?

In order to create a firm massage roller, I'd like to glue a piece of (foam) yoga mat around a short pvc drainage pipe. Would love advice on - 1. Which glue to use between mat and pipe? and between the mat ends? 2. How to not have a bump where the mat ends meet? Thanks!

Topic by mirileh   |  last reply


is it possible to boost my wimax speed with a bi-quad antenna

Is it possible to "hack" my wimax modem so I can boost the speed with a bi-quad antenna or through some other means? Here's the wimax modem type http://imgur.com/vrsoHqW and here's the modem opened. [img]http://i.imgur.com/JlDAezf.jpg[/img]

Topic by dmanstan   |  last reply


Converting G clamps or similar to a bench vice?

Looking to make some stuff but don't really have access to a workshop. Not so much of a problem tool wise, all I really need as a drill and a hacksaw, but will definitely be needing a medium size bench vice. Don't have one, can't afford one. So was thinking to somehow convert one or two G clamps or something similar. Was wondering if there's any existing resources or tutorials on how to do this, just so I don't unnecessarily reinvent any wheels. ta.

Topic by SolarFlower_org   |  last reply


Rotating Backdrop for Video

Hi All: I'm looking for ideas on creating my own rotating backdrop for a video that I'll be creating for my book. I will be drawing/painting a city skyline onto some type of paper or another and then want to be able to have it on a continuous 'scroll'. (Think a reel-to-reel player type of setup except using manual power.) Any thoughts? 

Topic by katlinbr   |  last reply


Scrolling Backdrop for Video

Hi All: I'm looking for ideas on creating my own rotating backdrop for a video that I'll be creating for my book. I will be drawing/painting a city skyline onto some type of paper or another and then want to be able to have it on a continuous 'scroll'. (Think a reel-to-reel player type of setup except using manual power.) I've considered paper towel holders on a Lazy Susan project....Any thoughts? Many thanks!

Topic by katlinbr   |  last reply


12v Portable Led lighting Help

I really need some help trying to power these led lights onto a portable table Im building.I need the power supply to be as small as possible. I honestly have no idea what Im doing except that i need a 12v power supply.I work on cars and custom put in leds all the time but the power supply always comes from main car battery.I have never tried to power them before from a small battery like AAs before for example. If anyone has any ideas please respond because I can not finish this project until I get the lights to work and I don't want to go wasting money buying stuff in the wrong places. I will also include a link to the ebay page where I bought the lights. Another thing is I have done research and cant find what the amps they draw are.  

Topic by godfather29 


What is the tolerance in resistors?

Topic name is pretty much self explanatory. What is tolerance in resistors?

Topic by Dantex   |  last reply


LEDs - Under-volt, over-amped?

My issue: Have multiple LED drivers, (high power LED instructable) and connected the wrong one. The LEDs are not dead. My LEDs are rated at 9-12v, 950mA and I have sets of 4 in series hooked up to a 36v power supply. The driver I used has a .3ohm resistor on it. so it's putting out ~1.3A The LEDs should have burned up. Since the driver eats up a little of the voltage, each LED is getting ~8.75v. Is this why they haven't burned up? Thanks!!

Topic by thestip   |  last reply


Compact bubble gun mechanism?

My 7yo was begging for a bubble gun, and I promised I'd 3d print him one.  To my surprise, there are very few 3d printable bubble machine designs around, and none that match what he wants.  (He wants it to have a handle and trigger like a handgun.)  So, I suppose I'll be designing one. . . (FYI - My parts bin has plenty of fans and motors and even small liquid pumps and I am competent at 3d design. ) My challenge is that the basic rotating disk method of wetting the bubble hoops is both too bulky for a handgun-style bubble shooter, and is highly spill-able. I see online there are numerous toy bubble guns that look like what I want and appear to be much less spill-able.  However, I can't figure out from the pictures how they work, beyond that there is a pump that sends bubble solution to above the hoop and a funnel to route the excess back into the container.  How does the bubble solution get swiped across the hoop reliably? (And, yes, I know it would be easier and cheaper to just buy one.  That's not the point.)

Topic by SvdSinner   |  last reply


Arduino | Run 2 Function at the same time.

Hi , i wanna ask about 2 function which is Ultrasonic and Heat that run at the same time  , For me , i just got Heat running as i want but the Ultrasonic doesn't trigger the buzzer if object (Laptop) 30cm away from the ultrasonic. I've been trying since last week but the result is still the same ;'( Btw here is the code , i've seperate it to 2 function which is Ultrasonic and Heat.  i hope u guys can guide me which part should i change or Add. Thanks in advance ;) //*********************************** #include #define trigPin 6    //trigPin #define echoPin 7    //echoPin LiquidCrystal lcd(12,11,5,4,3,2); int tempPin = A1;   // the output pin of LM35 int fan = 10;       // the pin where fan is int led = 9;        // led pin int temp; int tempMin = 35;   // the temperature to start the fan int tempMax = 70;   // the maximum temperature when fan is at 100% int fanSpeed; int fanLCD; int duration, distance; int buzzer = LOW; void setup() {   Serial.begin (9600);        //Baud rate   pinMode (trigPin, OUTPUT);  //trig pin as output   pinMode (echoPin, INPUT);   //echo pin as input   pinMode (13, OUTPUT);       //Buzzer pin as output   pinMode(fan, OUTPUT);   pinMode(led, OUTPUT);   pinMode(tempPin, INPUT);   lcd.begin(16,2);   } void ultrasonic() {   digitalWrite (trigPin, HIGH);   delayMicroseconds (1000);   digitalWrite (trigPin, LOW);   duration = pulseIn (echoPin, HIGH);   distance = (duration/2) / 29.1;   if (distance > 30)   {     Serial.print(distance);     Serial.println(" cm");     digitalWrite (13, HIGH);   }   else   {     Serial.println (distance);     Serial.println ( "cm");     digitalWrite (13, LOW);   } } void heat() {   temp = readTemp();     // get the temperature   if(temp < tempMin) {   // if temp is lower than minimum temp     fanSpeed = 0;      // fan is not spinning     digitalWrite(fan, LOW);         }   if((temp >= tempMin) && (temp <= tempMax)) {  // if temperature is higher than minimum temp     fanSpeed = map(temp, tempMin, tempMax, 32, 255); // the actual speed of fan     fanLCD = map(temp, tempMin, tempMax, 0, 100);  // speed of fan to display on LCD     analogWrite(fan, fanSpeed);  // spin the fan at the fanSpeed speed   }   if(temp > tempMax) {        // if temp is higher than tempMax     digitalWrite(led, HIGH);  // turn on led   }   else {                    // else turn of led     digitalWrite(led, LOW);   }   lcd.print("TEMP: ");   lcd.print(temp);      // display the temperature   lcd.print("C ");   lcd.setCursor(0,1);   // move cursor to next line   lcd.print("FANS: ");   lcd.print(fanLCD);    // display the fan speed   lcd.print("%");   delay(200);   lcd.clear();   } float readTemp() {  // get the temperature and convert it to celsius   temp = analogRead(tempPin);   return temp * 0.48828125; } void loop() {    ultrasonic();   heat(); } //***********************************

Topic by Melromeo   |  last reply


Not receiving notifications when comments are made

Today I noticed that there were a few comments to my instructables that were made some time ago and I never knew existed.  In my settings I had made the choice to send me an email when comments are made so that I can respond in a timely manner. Looks like it is not happening.....can you help?  Thanks in advance.   V/R ElmarM

Topic by ElmarM   |  last reply


How fast can you spin your Golf Ball?

I played around with some balls placed into the airstream of a little blower. Everything light enough just "danced" in the air like being hold on invisible strings. But not so much the golf ball! You would expect those dimples are good for reducing air friction but do they also offer stability in some cases by making the ball spin? Check this video I recorded while playing - to me it looks like with a proper nozzle there is even more speed possible. https://www.youtube.com/watch?v=014QkXuTL0o How fast can you make it spin?

Topic by Downunder35m   |  last reply


(Wire Headpiece) Does anyone know how get the silk rose on like this?

No intentions to rip off anyone's work! I am new to this and really want to play around with the style. I just don't get how the silk flowers are attached, though! Thanks in advance. Kindly, Danielle *Photo is from BeSomethingNew on Etsy

Topic by brattattak   |  last reply


Removing duct tape residue

Does anybody know of an effective way to remove the residue left from gaffa tape that wont melt plastics or harm electrics? I recently got an old keyboard that covered with it. (there is a lot of the stuff)

Topic by Tomkatt   |  last reply


garden hose spigot: fixing/replacing

I have a spigot like the one pictured. The bottom connection is a male 5/8 inch garden hose connection. It is leaking pretty badly around the handle/pretty much through it when opened. Any ideas on how to best fix it, or perhaps what to replace it with if replacement is a better idea, would be more than welcome. Thanks. Boris.

Topic by BorisE5   |  last reply


Laser Cutting Help!

Hello, just wondering if anyone knows how you can laser cut an engraved image (bitmap) which you have taken off the internet? I am using Coreldraw, Corellaser and Laserdrw and don't have much experience at all with it. Thank you.:)

Topic by JadeyP   |  last reply


Does Electrical Tape Have A Use?

Hello, I was wondering if black electrical tape actually had a use? I ask because it doesn't seem to really stick to anything for very long. It eventually becomes un-done from what it was wrapped around and then leaves a sticky residue behind. Am I not using it properly or not using it the way it was intended? Does anybody else have this problem? (I have the same problem with that Saran clear plastic wrap stuff, it doesn't stick to anything but itself. So, it could be user error.) Thanks J

Topic by sdtacoma   |  last reply


See Who Favorited Your Instructable

We should be able to see who has favorited an instructable. Just an idea.

Topic by BenjiDaa   |  last reply


installing attic access ladder

Hello there, I have an access hatch already cut into my ceiling. I am now wondering whether to get a ladder and install it myself or to hire somebody. The access panel is over the steps to the basement. Here are the parameters involved: hatch: 28in x 30 in height to 1 st stair down: 8ft2in Yes, the hatch is small but there are ladders that fit it. Here's one, for example: http://www.homedepot.com/p/Werner-7-ft-9-ft-18-in-x-24-in-Compact-Aluminum-Attic-Ladder-with-250-lb-Maximum-Load-Capacity-AA1510B/203009104 So my question is, should I install it myself or is this not the sort of project one person can do comfortably, and it is best to just hire a couple carpenters to do that? Thanks. Boris.

Topic by BorisE5   |  last reply


I should be able to access my own Instructable PDFs

How can I check that my Instructable looks correct in the PDF if I can not access it? I only need access to my own - so this should be fixed.

Topic by CommunityWorkshops   |  last reply


Arduino Strobe Controller for bike lights

Hey guys, this is where I am selling kits to build my ultimate Arduino strobe controller system. Read about the whole project here! Bare PCB alone (comes with a BOM for population): $8 Complete Kit with everything but the light modules and battery charger: $50 These prices include shipping within the continental USA. If you're in the US, I will include two 18650 Li-ion cells with the kit. If you are outside the USA, shipping will cost more but I can't ship the batteries, which works out so the price will be the same! You will still need to acquire a charger and supplies for building your light modules, no matter where you live. PM me if you are interested in buying a kit!

Topic by thecheese429 


Arduino 12V Car-alarm with PIR sensor and remote control - expertise needed. :-)

Hi all, This is my first "big" Arduino project and my first fritzing, so please bear with me. :-) Goal: - Build the cheapest possible car alarm system with a loud siren - It should be possible to activate/deactivate the alarm with a remote control. - The alarm will once activated, sense any motion in the car (if someone breaks a window and tries to steal anything) and set of the alarm. - The system should not drain the car battery so it should draw a minimum of power. I've managed to build the first few things, but some vital steps are still needed and I hope you can help me sort these out. Components used so far: Arduino Pro Mini - TIP122 transistor - 2.2KOhm resistor - 1N4002 diode - Mini piezo siren (I used a 107dB siren with an operating voltage of 6-15Vdc and current consumption of 140mA) - Breadboard - Lots of wires I'm currently waiting for my PIR sensor to arrive together with the RF receiver/transmitter module, so for now I've added a basic switch to act as the PIR sensor and another for the RF module (activate/deactivate). The components I'm waiting for are: - An RF module that I need to order once i find the right one. - http://www.ebay.com/itm/261041100836?_trksid=p2060... Questions that still remain and that I hope you can help me with: 1. The arduino should be powered by the cars 12V battery, however I've read that the car battery must be regulated as it delivers anywhere from 12 - 16V. I could connect it directly to RAW but in case the battery peaks above 16V i risk damaging the Arduino. I'm very unsure as to how I do this regulating best? One option could be to buy a "DC-DC step down converter - 4-35Vdc > 1,23-30Vdc" and set it to 5V, but maybe a more simple and/or cheaper solution exists? 2. Since the power consumption should be kept to a minimum, I plan to add the RF before the step down converter so the powering of the regulator (step down converter?) only happens if the alarm is activated from the remote. First question is: can I use a TIP120 for this and simply connect the RF to base, and the regulator to the collector? Second: In this case, the Arduino will be powered off the hard way by cutting power when deactivating the alarm from the remote - can the arduino take that in the long run? and finally, the RF receiver needs to get its power from somewhere, so what can I do here - is the best thing to use a 12V RF module instead of the Arduino 5V RF module or can this be solved some other way? 3. Any good ideas for minimizing power consumption? 4. Anything I can do to further improve the design? :-) I'll update this post as I progress with the project including a more detailed step guide to how to implement this and the source code I'm using. Instructables arduino posts and commets have helped me a lot during over the past few weeks working with Arduino so I hope you can help me reach the finish line with this project. Br. Jakob

Topic by Zyb3r   |  last reply


Cannot download pdf

Hello I paid for a 2 year membership and most of the features have worked. There is no ads etc. The issue is when I try to download the pdf file to save for offline use it tells me that I need a Pro Membership.

Topic by FurbeeM   |  last reply


A Good Crucible

Im new to the forge community and i need some advice. I built my first forge useing the charcoal and coffie can method. i melted about 20 or more cans so far and got about 86 grams of aluminum. The crucible i used was a soup that i burned through. I done that twice. While melting I got a lot of slag. Is that normal when melting cans? I also need a good crucible. What can i use for now and where can i get a good one later. I plan to make a propane forge in the near future so a few tips here would be helpfull as well. Any and all advice would be helpfull. Thank you in advance ~Jeht Black~

Topic by Jeht Black   |  last reply


solar powered cooler

Using these ideas as a starting point:http://en.wikipedia.org/wiki/Icy_Ballhttp://en.wikipedia.org/wiki/Einstein_refrigeratorhttp://en.wikipedia.org/wiki/Gas-absorption_refrigerator"Another variant uses air, water, and a salt solution. Warm air is passed through a sprayed solution of salt water. The spray absorbs humidity from the air. The air is then passed through an evaporative cooler. Humidity is removed from the cooled air with another spray of salt solution. The salt solution is regenerated by heating it under low pressure, causing water to evaporate. The water evaporated from the salt solution is recondensed, and rerouted back to the evaporative cooler."Directions on how to make an icy ball. URL works occasionally.http://crosleyautoclub.com/IcyBall/HomeBuilt/HallPlans/IB_Directions.htmlhttp://blog.modernmechanix.com/2007/07/19/refrigerator-uses-solar-energy/Is a non-flammable, non-toxic, and low pressure version possible?

Topic by beforethought   |  last reply


Dual energy generation with magnetic Seesaw system and gravity with the help of 3 volt toy motor

This technology is based on  a Seesaw system and magnetic repelling principle Linear motion  .We can generate electricity with very little force with the help of this technology.This will be a radical step in the field of energy generation. In this technology there will be a balance system and two heavy weight magnets(high strength NEODYMIUM MAGNETS) will be attached with each side of this balance system as per diagram. As per diagram there will be two moving weights and these moving weights will move on tracks.These tracks will be fixed at the angle of 8 to 10 degree. Two magnets will be attached on the front side of these moving weights and these magnets will have similar polarity with the magnets of balance system. These moving weights will be attached with two gear boxes and these gear boxes will be attached with two generators. HOW THIS TECH WILL WORK? When one side heavy weight magnet of balance system will be pressed with the help of any kind of external force then this side will come down and repel its side moving weight due to equal polarity of magnets.due to repelling the moving weight will move forward .but when the heavy weight magnet will move upward then this moving weight will move backward due to gravity to get its position back. in this way this moving weight will work to run a gear box and this gear box will work to start a generator to generate energy. This balance system will also work to pass through their side copper coil due to linear movement and in this way this technology will generate Dual energy. WE will take very high strength NEODYMIUM magnets  for balance system. I would like to insist on some following points (1) The balance system will be attached with 'L' form crank with external PRESSING source. (2) The moving weights will also be attached with 'L' form crank with gear boxes. (3) Each side magnet of balance system will work one by one .When one side magnet will come down the another side magnet will move up .These magnets will come down and move up one by one to repel their side moving weight. (4) We can take as much weight as we can of these magnets of balance system .(500 kilogram to 1000 Kilogram or more) to pass through the heavy coils having 100000 turns or more.  (5) External source of pressing this balance system could be anything such as pressing with foot  or solar cell. WE WILL NEED ONLY 3 VOLT EXTERNAL ENERGY TO PRESS THIS BALANCE SYSTEM  AND GENERATE MORE AND MORE ENERGY.

Topic by vikram_gupta11 


Share your websites for free samples

A while back I was doing an electronics project and needed some components. I found that you can get free samples of components from some companys if you ask nicely. There are some good instructables on that that I will link below. I am now trying to experiment with different metals and am trying to find some websites that will give out free samples. But please put all the good websites for samples here so that anyone can find them if they have a project they want to do. The website I have found so far but I have not ordered from them yet: http://www.garrisonminerals.com/ Some of the instuctables i found: https://www.instructables.com/id/How-To-Get-FREE-Electronic-parts/ https://www.instructables.com/id/How-to-Get-Free-Electronic-Samples/

Topic by Nedla2000 


Transformer not behaving...

I hope someone here can help.  I have a AC to AC step down Unrectified transformer, i.e., no circuit board whatsoever.  Primary winding has continuity, secondary wire has continuity.  No continuity between primary and secondary wires in any way.  In short, power goes in, but no voltage comes out.  If someone that knows precisely how transformers work can explain to me how a magnetic field can be generated but no electricity generated on the 2ndary wire I would appreciate it.

Topic by PeterE56   |  last reply


Do I need to use a metal box for an outlet?

I'm making a concrete art piece and want to insert an electrical outlet inside it.  Is it okay if I embed the outlet in the concrete or is there a reason I need to use the metal outlet box like is used in the wall?

Topic by mazelady   |  last reply


Can't Favorite Instructables or Follow People

This has been happening the past few days intermittently... when I try to click an instructable to favorite it, or try to follow a user, the button does nothing. Doesn't matter if I am on the users page. I've tried refreshing both tutorial pages and user pages to favorite or follow (respectively) to no avail. I've also tried logging out. Help!

Topic by chloe.stamper   |  last reply


Disecting Strobe FX

Hello all you LED inventors I have a few questions for you....One of My Favorite LED toys ever is the Stobe FX LED wand(which they dont make anymore) they used to be ten bux each NOW they are like 75 a pair on EBAY....What I would like to do if possible is collaborate with some one that knows electronics and might beable to hel me recreate the effect but Modify it for durability...The wand has 30 mode and 2 buttons one turns it one and one changes the color 15 original modes but if you hold the CHANGE button it send orignal into slowest too fastest mode...I have some "dead" soliders that I can use for "POI" like to practice my FIRE arts.. Neighborly Yours Dave myspace.com/hrdcr4lf

Topic by hrdcr4lf   |  last reply


Will a 240 Volt AC Motor Operate on 120 Volts AC

I need to know if a 240 volt ac squirrel cage fan motor can be safely run on 120 volts ac. An quick internet search reveals several sources that all say no, but I am concerned that the people answering the question don't know what they are talking about - as is often the case on the internet. I know there are a lot of want-to-be engineers out there ready to answer any question posed even when they have no experience or knowledge of the issue. Please do not guess at this or offer some unsubstantiated opinion.  I need a real answer to this question. Here is what I do know about this issue from researching a couple of electrical engineering sites. Lowering the motor input voltage by 50 % does several things. 1) The motor will run slower. 2) The torque developed will drop to about 25% of its full voltage rating.  3) This decrease in torque can make the motor stall when trying to start under a heavy load. 4) There may be drastic speed fluctuations due to load variations.  5) The motor current will double if the load remains constant. I can understand how these issues could cause severe problems in some applications, but perhaps not in the application I am looking at. I want to use a squirrel cage motor rated at 1/20 HP, 240 volts, 0.5 amp in a direct drive fan application. Here is how I am looking at this issue: - I need to reduce the fan speed so the speed reduction is a good thing in my application. - I have test run the motor on 120 volts for about an hour and there is plenty of torque to operate the fan. I figure at the lower speed there is less air load on the fan blades so less torque is required. Again a good thing for this application. The is no heavy load at start up and the motor seems to have plenty of starting torque for the fan. The fan does not reach full speed as fast as it does on 240 volts, but it still does so in about 4 to 5 seconds so this shouldn't be an issue either. Since it is a fan moving air and not some machine moving gears and levers the load is constant so the speed does not fluctuate at all. Again this should not be a problem. The possibility of the motor current increasing is my only concern so far and apparently it is not an issue since a test run showed the current decreased from 0.5 amps at 240 volts to 0.4 amps at 120 volts.That is a significant current drop instead of the predicted increase. Since this is a fan, I think the current decreases because the load decreases with the lower speed. For these reasons and based on my apparently successful test run I think the motor will operate fine on the decreased voltage. However, I am not sure how to factor the motor slip into this. Slip is the difference between the synchronous and asynchronous speed of an induction motor. From what I have read the slip will increase dramatically when the voltage is cut in half, but I am not sure what physical affect that will have on the motor. If you know what effect that will have or know of some other factor I am not catching please let me know.         

Topic by biochemtronics   |  last reply


Led Lightbulb for r7s socket or how to repurpose from rs7 to gu10 or other sockets

I have some nice wall lights but mounting R7S bulbs. These are halogen and of course use a lot of electricity. I have looked everywhere for a compatible LED lightbulb but the problem with all the ones available is that they are designed to fit floodlights, ie. they take too much space and cannot be fit if your socket is a small linear r7s. Attached example of the led bulb shows that behind the connectors the casing takes too much space and this is what is stopping me from using these lightbulbs. Also u can see my lamp and how tight the space is behind the halogen bulb So questions 1 - do you know where i can find such a lightbulb with no space or very little space behind connectors ? or 2 - any instructions on how i can repurpuse the current lamps by replacing the current R7S socket with something else?  I dont know much about electrics so i wanted to get a understanding with a step by step process so that i dont blow myself up. pls notice this forum images are not getting saves so here is a link to a album to the wall lamp images

Topic by diegog4   |  last reply


Pro Membership Giveaway

Hey everyone! In the spirit of the season I'm giving away 10 free 3-month pro memberships. If you'd like one just leave a comment and I'll send you a code in a private message!

Topic by M3G   |  last reply