Can I use Arudino Uno instead of  the Arduino pro mini 328?  I am interested in the following Project so please help    http://www.engineersgarage.com/contribution/intelligent-letter-box-using-arduino-and-gsm

Posted by RanjitE1 4 years ago  |  last reply 4 years ago


Can some help me to give a circuit diagram in heat sensor cooling fan using only thermistor, potentiomet and resistor. 

Posted by vcente.capio.1 4 years ago  |  last reply 4 years ago


Hai sir,          i am udhaya engineering student.i have one doubt ............ HOW TO INSERT A PROGRAM IN INTEGRATED CIRCIT?         please send me about this details...

Posted by udhaya anandh 5 years ago  |  last reply 4 years ago


Hi again it's me i was wondering if there is anyone out there who can help me. i'm trying to learn about transistors resistors... etc. and how they work i understant the resistor color code but that's about it. please help me i want to learn this stuff.

Posted by rickick 11 years ago  |  last reply 11 years ago


Hey everyone does anyone know any good ideas for making a portable ham radio transmitter and receiver that can fit inside an iPhone case (the cardboard case you buy them in)? It would be good if it was a kit, but it would be better if it can be made using a breadboard and other bits and pieces. Anyone have any ideas?

Posted by simonyu 5 years ago  |  last reply 5 years ago


I want to cover a stairway.  The motion detection camera that is in the library here is a very good start.   I want to add the following functions. 1. long battery life 30 days min. 2.. Rotating photo storage.  i.e. when the memory is filled up, the camera will overwrite the oldest photo. 3.  Date and time stamp A unit like this could be left in place for a long period and only accessed if something has happened that need to be checked.   

Posted by jscanlan 5 years ago  |  last reply 5 years ago


I am currently working on a project that requires energy harvesting ,so i decided to use electromagnetic induction for the purpose. However I can not decided how to design my magnet and coil combination. All i know is i want 2.6-3.3v and 26mA for round about 4 ns. The setup in brief required a movable permanent magnet and a stationary coil. The moment of the permanent magnetic is like a oscillating pendulum just for once but with a sleed of say about 15km per hours. So can you please suggest me how should i start designing. thank you

Posted by SiddhantS6 3 years ago  |  last reply 3 years ago


Http://www.taskled.com/techbflex.htmlI wonder if anyone can helpI want to make a bike light using CREE leds (*4) and have spotted the bflex (see here - http://www.taskled.com/techbflex.html - I was going to go for the UIB2 version) as it has battery monitoring facilities built into it. You set two voltage values v(low) and v(med). There's a connection on the board V(stat). S is the voltage from the battery.V(stat) = 0 if S is higher than v(med) => State 1V(stat) = 3.3V if S is between V(low) and V(med) => State 2V(stat) = alternates 0 and 3.3V between 0V and V(low) => State 3So I was thinking (of displaying this via 2 LEDs (green and amber))State 1 - green on, amber offState 2 - green off, amber onState 3 - alternating between green and amber.I was hoping to combine the LEDs into one bicolour LED. If anyone has any cunning plans or improvements they'd be appreciated.. whatever it end up with though it mustnt use up too much battery power.

Posted by EXM 11 years ago  |  last reply 11 years ago

Electronics Book

I want to start a few projects using a Arduino board and know what I'm going to do. The problem is I do not understand some concepts and parts with electronics. I was woundering if anyone could recomend a decent Electronics Book to help me grasp concepts and what specific parts do. Try to keep it in the $20 range because I have a gift card to amazon. Once I document my project I'll do an instructable.

Posted by acer73 10 years ago  |  last reply 10 years ago

Beginner in Electronics? Answered

I am a complete beginner when it comes to electronics. I would like to build functioning machines eventually, so does anyone know how exactly I can get started? Are there any specific books? Thanks, freeza36

Asked by freeza36 7 years ago  |  last reply 7 years ago

Electronics help

I need an easy way to distribute power 2 way and when the on button is switched the correct goes one way and when off then on again it goes another? Thanks

Asked by Camyo 3 years ago  |  last reply 3 years ago

Electronics Help

Hi ppl,I am currently making a variation on this circuit:http://www.edn.com/article/CA257052.htmlhttp://www.edn.com/contents/images/257052f1.pdfI understand how it all works but do not understand the principle of the inductor capacitor used (bottom left), if anyone could give a brief explanation of this (links are good too) and also some formulae i would b e very greatful!!thanks

Posted by drummer ian 11 years ago  |  last reply 5 years ago

Beginner In electronics

Hey, I've just started getting into electronics, it interests me alot. I have a pretty good understanding of each individual component, but don't have a good one of how they work together, so do any of you know of a good 'circuit cookbook' that has easy circuits with explanations? That would be great. Also, what components should I always have around if I'm just tinkering? I have a bunch of resistors (1 ohm to 1M ohm) and a bunch of capacitors (.22 UF to 2200 UF).

Posted by Jackhole 10 years ago  |  last reply 9 years ago

Books on electronics?

Hey guys, ive been a big fan of the site for a long time but have only just signed up. I just wondered if anyone could recommend to me some good books/guides on basic electronics and circuit building. Iv always been interested in the way electronic devices work and after viewing some cool looking instructables on here decided i want to try and learn about how to make them. It is also fueled by my interest in physics which i want to pursue in university. Any advice would be much appreciated, thanks.

Posted by The Stans Mysterium 10 years ago  |  last reply 10 years ago

Sounds with electronics

So here goes, I am trying to figure out how to make basic sound generating machines. Preferably generating a sound that can be modified with a potentiometer or something of the sort. The principle is simple, these will be for messing around, possibly, if the result is good, using in some random recordings of mine, so most of the machines will have a jack out plug. Anyhow I was wondering, what, in a circuit, actually makes sound, what is the base of all sound generating electronic devices (synth, analog stuff, beepers) what actually creates the wave, the current that is sent to the speakers? Have I just answered my own question by saying current? Is it just the electrical current, and putting random resistors, capacitators, potentiometers and stuff changes the sound that is generated? Any help is more than welcome! and if anything good comes of it, I'll post some sound clips!

Posted by gavox 7 years ago  |  last reply 7 years ago

Electronic schematics?

I need a free electronic shcematics Program that checks my circuits.

Posted by OrIsIt 6 years ago  |  last reply 6 years ago

For electronic n00bs

This topic is made to help all who don't know a lot (or even anything) about electronics. Here people can ask simple questons without opening a new topic.

Posted by Dantex 10 years ago  |  last reply 8 years ago

Electrons and Photons? Answered

Under the right circumstance in a synchrotron for example, electrons accelerated to very high speeds can be made to give off photons. Apparently to preserve the laws of conservation of momentum and conservation of energy. i assume this means the photons in this case have mass to allow the electron to obey these laws so does this mean: 1. Electrons contain the photons 2. Electrons generate the photons 3. Photons are spontaneously generated by some other effect 4. The electrons are dragging photons along with them. Why do i have a feeling I am not going to understand the answer, if I could I probably wouldn't have asked the question!

Asked by rickharris 6 years ago  |  last reply 6 years ago

Electronic Disabler?

Is there something that exists that can wirelessly short-circuit electronics? I haven't found anything on Google. I'm pretty sure i read something about a guy making something called an F-Ray that did this, but that was in Tesla's lifetime I think. In short I want to build something that can over-voltage or short circuit electronic devices/machines. I don't care if it ruins them or temporarily disables them.

Posted by Jordo 10 years ago  |  last reply 8 years ago

Electronics Source

I know that there have been posts all over the place that list sources for electronics components, but I was having trouble finding them, and then I figured it would be helpful for everyone if we had one place for them. So, please post links to your favorite electronics components sources. I know I could use them! Thanks Rick

Posted by mrmath 12 years ago  |  last reply 10 years ago

Electronic Butterfly

Dear all: Have anyone trying to make an electronic flapping butterfly with flapping pattern that resemble an actual butterfly? Can you shine some light on me if you've attempt it before? If not, do you have any suggestion? Phillip

Posted by Gardenerprune 11 years ago  |  last reply 11 years ago

An Electronic piston

Please guys I need a small 12 or 24 volts  device  that can give me a forward movement when it's powered on and backward movement when it is off or vice-versa. Just as pneumatic pistons work, but I need it to be electronic. please help it is very urgent. thanks

Asked by victorious4live 2 years ago  |  last reply 2 years ago

electronic "key"

One more forum post and then I swear I'll take a break!!! I would like to build a sort of a "secret box," where access would be had through a sort of electronic "key." A few specifications: (1) the box would be permanently out of doors, and (2) the "key" would be simple enough that I could give interested parties the schematics and tell them to make one. I'm thinking a USB connection would be a natural, but I'm not an electronics person, so I'm open to all suggestions. Thanks!!!!!

Posted by Purple Chez 3 years ago  |  last reply 3 years ago

Electronic Level

I need to level a 32' long machine. Lengthwise is easy, but along it's width is a pain. I have to check in about 8 places along the machine. This takes awhile to do with only one precision level. Since these levels are about $120 each it is not realistic to buy eight. I need to save time and effort. I was thinking of trying to build a bunch of electronic levels to place in their designated areas so I can find the "level" of each area without moving a level to it. Any ideas?

Posted by Monger 10 years ago  |  last reply 10 years ago

micro electronics

Basic of this post is where e to buy micro size electronics for micro flying drones which are insect size? I asked arduino and raspberry pi, no answer yet.  in this post : https://www.instructables.com/id/3D-Printed-Ornithopter-Micro-UAV-Drone/     there is electromotor which OP claim that was used also by inventor of little flying drone...regarding arduino uno board i am not sure that was really used by inventor, please see pictures and videos on youtube....so if someone knows please post where to buy such micro size electronics. Thank you  

Posted by ruma29 3 years ago  |  last reply 3 years ago

Electronics Noob

Hi, I was thinking of making something that will light up one set of LEDs when you push the button, turn off, and then light up a different set when the button is pushed again, and they alternate each time. Do they make a switch for that sort of thing?

Posted by octochan 10 years ago  |  last reply 9 years ago

Electronic timer

I want to make a timer that sounds an alarm every three minutes, pluss one for setting a seperate alarm for 1 minute.  It is to be used during cpr, (treatment cycles are 3 minutes. 1 minute from shock to circulation check.  Can anybody help me??

Posted by leidulv 9 years ago  |  last reply 9 years ago

electronic switch

Hi, i'm a bit new to electronics. I was wondering if its possible to turn on the flow of current by another electrical signal. Yes, i know about transistors and relays but these switches turn off as soon as the second current is stopped, how to make this change in switch permanent, i'll be precise, i'm working on a laser alarm system, and it works fine, but the thing is that when i block the laser, sure the buzzer goes off, but when the obstruction is moved, the buzzer turns off, how can this be kept on until turned off manually by a switch. i know it must be quite simple but i dont know, please help thanks

Posted by walee 1 year ago  |  last reply 1 year ago

Electronic catapult?

Okay. I'm going to make an electromagnet to hold the spring in place while it's compressed, and then as the power turns off, the spring will release and shoot the catapult. However, I'm not an engineer-- I'm making this for tech class. How should I design the catapult so that this will work as a triggering mechanism? In what way should I set up the spring and electromagnet relative to each other? Thanks in advance.

Posted by camiheall 3 years ago  |  last reply 3 years ago


20 amps transformer of 14-0-14 volts from 220 volts bobbin size? primary gauge,turns? secondary gauge,turns thanks.

Posted by imamfarid 5 years ago

Electroplating for electronics

An idea has occurred to me about how PC boards are currently made. The normal process now is a destructive one, where unwanted copper is etched away. What about figuring a way to electroplate the traces onto a substrate? Various toys and model parts are made of plastic, and yet have been electroplated with a cheap form of chrome. Why not apply that to PC boards? I'm thinking that a photographically negative mask could be used in a photo-sensitive process to apply the conductive surface to a heat resistant substrate, and then the copper traces could be electroplated on. Anyone have any thoughts on this, primarily at a hobbyist level? **note - cross posted in tech.

Posted by charlie_r 9 years ago  |  last reply 6 years ago

Electronic Disruptor

OK, so a few years ago my brother got an r/c something or another for his birthday, one day i was screwin' around with it and to my suprise, when i pressed a certain button on the romote, all the lights in the room went out. when i released the button they came back on. I tried it in a few rooms, and it usually had the same effect. i'm guessing there is some sort of combination of capcitors/risistors or something that did this. The r/c toy has long since been lost and i can't recall what it was, and i'm more in to mechanical stuff then electrical stuff, so if some one with some knowledge could help me out, i want to build another one for messing with people at a halloween party.

Posted by amazingpaste 10 years ago  |  last reply 10 years ago

Electronic Toolkit

I do some work with the FIRST Robotics kids and it is amazing to see what they are doing.  Big problem though seems to be a general lack of electrical test equipment.  They don't really have the money to buy oscilloscopes, function generators, CAN and I2C analyzers.   So I got one of the M3 Discovery boards from STmicro and it is really cool.  It has four 5MS A/Ds on it plus a whole host of other features(CAN, I2C, Serial etc.). http://www.st.com/web/en/catalog/tools/PF254044 So it got me thinking. Why couldn't we turn one of these chips into an "All-In-One" electrical toolkit and keep it cheap($50-$60, BOM ~$20).  It would be fairly easy to turnkey. I threw together some simple specs, what do people think. 1) Will supply general use drivers so a user can use the app or write their own. 2) Oscilloscope   a. Two Channel     i. 2MHZ of Analog Bandwidth per channel     ii. 10MS/s per channel     iii. Trigger on rising edge, falling edge, on-command, run-stop actions     iv. Datalogging for extended time periods at up to 10hz per channel (data stored directly to console),  maybe higher rate will  just have to see 3) Serial – 2 Ports   a. Multi selectable protocol w/slew control     i. RS232, RS422, RS485 4) CANBus – 1 port 5) I2C – 1 port 6) SPI  - 1 port 7) 8 Discrete User Selectable 8) Function Generator   a. Two Channel      i. 1MS/s small signal change      ii. 250kS/s full range change      iii. 0-3.3VDC buffered output  9) PWM - 4 Channels

Posted by ase4542 4 years ago  |  last reply 4 years ago

what electronic part is this??

What electronic part is this .What is it used for and some more details on it?!

Asked by imakethings 9 years ago  |  last reply 9 years ago

Electronics and Microcontroller guide?

Is there a a basic intro to electronics and microcontrollers? I know about the basic components, but no clue about microcontrollers =) Thanks!! Wes

Posted by wesie42 8 years ago  |  last reply 8 years ago

Electronic boards manufacturer

I just found this on Faebook, for budding Manufacturers to outsource their electronics: https://www.facebook.com/elecrow.openhardware/

Posted by Edgar 2 years ago

Wholesale electronic components???

I was hoping someone here would know of a place i could buy electronic components at wholsesale prices. I'll buy bulk. The reason i say this is a friend is setting up an electronics store, but at the moment it's looking like he'll have to buy-in at retail, which'll leave his sales prices very high. Please help me out. Tom

Posted by lifelong-newbie 10 years ago  |  last reply 5 years ago

Unreadable electronics diagrams?

I see only unreadable blurred electronics diagrams on this site. I can not read component values​​, not even when I enlarged the pictures, not very useful. Is there a way to fix that ?

Asked by louis.m 7 years ago  |  last reply 7 years ago

electronic project problem

I am making a project  and i want a  way to make two devices that one of them has an LED on it and when the other devices goes out of a certain range 30m lets say the LED either comes on or goes of and i dont want them to be  connected.It's for a school project and i wanted it to be small so I could attach them on to bicycles let's say and then if my brother goes 50m ahead of me the LED will come on/go off on his device so that he is aware of the distance between us I know nothing about electronics at the moment, this might put you off helping that's okay  i hope that makes sense to somebody and that someone has an idea. thanks

Asked by vitusvenon1 6 years ago  |  last reply 6 years ago

What are these electronic parts for? Answered

I was taking apart this toy car called a formula fueler from hot wheels and found these to parts that look like leds but on a board. They each have a led thing and two wires on has red and black wires while the other has  purple and black wires. The red and black one has thes letters on it "LED REV:03 B4048-0030050" and the one with purple and black has "PHO-TR REV:00 C4331-003-5000". What are these and what are they used for? Should i keep them for future projects?  

Asked by redlizard5 7 years ago  |  last reply 7 years ago

Beginning electronics guides

I'm looking for some help in how to learn electronics, meaning anything from circuits to arduino. If anyone has any info that can help me learn this it would be greatly appreciated.

Posted by acadena2 6 years ago  |  last reply 6 years ago

Free Electronics Magazine

I want to share a free electronics magazine that is available as a downloadable PDF file or online. The name is Electronicsmaker. I hope is helpful!

Posted by blkhawk 5 years ago  |  last reply 5 years ago

Basic Electronic Safety

Hello all! I'm beginning down the route of hobbyist electronics. As to basic safety precautions I'm really quite unsure. I know inside many electronics parts and devices (For example, a TV one would strip for parts,) there are many nasty chemicals. I don't want to get lead poisoning or any other sickness. If you could point out some safety precautions, I would be incredibly grateful (Ex. Always wear gloves, wear a mask when soldering, when stripping a TV...., etc.). Thanks for your time and help!

Posted by I Am That Guy 6 years ago  |  last reply 6 years ago

Help electronics beginer

Hi, I am trying to learn electronics and have few questions about some confusing stuff: - If one is measuring current in a circuit, he is supposed to connect the multimeter into the circuit. Ok, how do you measure current in the arbitrary track on the PCB? Are you supposed to cut the track open, just to take one measurement? - I have bench power supply, on which one can select voltage and current. If I connect toy electro motor it runs nicely. Power supply shows 3V, 0.17 A. But when replace electro motor with 1,800 ohm resistor, no current is drawn. If I insert multimeter between the resistor and terminal, multimeter shows that no current is flowing. Why there is no current flowing when resistor is connected and there is current when motor is in ? regards, dejan

Posted by COROVICD 11 years ago  |  last reply 9 years ago

Help me!!! (electronics)

Can somebody tell me where I should solder cabels to extend this switch (keep this one and add another). http://img443.imageshack.us/i/dsc00480w.jpg/ http://img693.imageshack.us/i/dsc00479cm.jpg/

Posted by Tubehacker01 8 years ago  |  last reply 8 years ago

Electronics for power supplies

First, I apologize for being (almost) the hardware version of a "script-kiddie". I do want to learn the techniques involved but all of the electronics courses I've found work the wrong way around. They teach "this is what we have and this is what you can do with it" whereas my brain works in the "This is the problem, here is a solution and this is why it works." manner. This is how I learned software but when you get it wrong you can start again without losing the magic smoke! I have a 250ah, 12V battery bank, multiple DC devices requiring power and, eventually, several power sources for recharging. I also have several MC34063 chips and a few higher amp chips (somewhat optimistically as it turns out). Firstly, is there a practical course online that is built around this? Secondly (and probably extremely basic), if a device draws, for example, 3A is it self-limiting or do I need to put something between the source and the device too restrict the power?

Posted by ImmortalSoFar 8 years ago  |  last reply 8 years ago

Trouble Starting in Electronics

I want to start getting in to making electronics, but I can't seem to know where to start. I recently bought an Arduino Starter Kit hoping to learn, but while I can understand and do all the listed projects, I can't comprehend why things are the way they are. For example, I don't understand how to choose the right resistors for lets say LEDs. Sure I could just pick the resistors I need for one of the projects, but that isn't going to help when I start my own projects. I feel that my main problem is that I do not understand electricity and circuits, but I can't seem to find good reference material to learn from.

Asked by Aetheron 5 years ago  |  last reply 5 years ago

electronics remote control

Could anyone suggest how to build an electronic system for using a radio signal to turn on and off another circuit. what i mean is a transmitter with a button you could hold and press a switch and a reciever in the circuit you want to switch on and off which prevents power reaching the circuit unless you are transmitting. i would want to be able to transmit over atleast 20 metres and through thin walls, aluminium foil and clothing. thanks.

Posted by resistanceisfutileiflessthan1ohm 6 years ago  |  last reply 6 years ago

got an electronics question

Ok, i've got a question for anyone with electronics knowlege... some time back i picked up one of those danelectro fab overdrive pedals. i wasn't expecting much, but for $15 i figured that if i got one usable sound out of it, it would be great and, to be honest, i wasn't disappointed at all... but, i was thinking about buying another and gutting them and putting their innards into a single case to make an overdrive with 2 cascading gain stages. now, the issue i'm having... unless i'm able to wire them up to run off of one 9v, there's no real point to doing this. other than the fun of getting to make some frankenstein effect pedal... which i suppose is reason enough. anyhow, i was wondering if anyone could help me out and tell me if i could run both off of one battery or not. in either case, any additional tips on how to go about wiring them together would be greatly appreciated. thanks...

Posted by JuCo 10 years ago  |  last reply 10 years ago

Electronic part site? Answered

I have been to many sites, just trying to find one that carries, well, everything! I'll go to one, and it'll have a whole bunch of led's, but no resistors, or a whole bunch of switches but no led's. I end up spending a fortune on shipping by ordering parts for a project from 5 different sites. I would like to find a site that has all these things in one place. leds switches resistors capacitors transistors most other basic electronic stuff. Share your site!

Asked by kcls 8 years ago  |  last reply 8 years ago