Arduino and proper proximity sensor

Hi guys. I want to use a proximity sensor and an arduino to know when a person is in the shower. What I have in mind if that if the sensor measures a range of distance it would mean that the person is in the shower. I have made some research and the infrared Sharp GP2Y0A21YK0F seems appropriate for the distance range I need that is around 20-60 cm depending on the size of the shower. However I am ignorant in this topic and I want to know if the water from the shower will make an interference when measuring the distance and generally speaking if this is a suitable sensor for my objective. additionally I read that the voltage output from this type of sensor is not linear, would it be difficult to actually know the distance? Many thanks in advance :)

Topic by mcamiea 

Laptop Screens

Hi I have several laptop screens and I would like to link them to a dvd player so that I can have a movie running on the dvd and watch it from the screens positioned in my mancave Is this possible? does the type of screen make a difference ie brand T.I.A. Neil

Topic by 69olds   |  last reply


Hey i have been trying to find out how to make an fm transmitter for quite some while now but i cant find out how anywhere. Can you help me we can work together.anyone got some ideas?

Topic by rickick   |  last reply

12 volt stabilizer/regulator (high current)

Hi, I need something that's able to regulate the car voltage that vary from 10.2 to 14.7 (with lower voltages at startup that's not relevant)  to a stable 12v with a tolerance of 1-2% at high current (need at least 35A but I don't want to full load it too often then 40A would be better). I saw something like a lm317 with some external transistor that's able to put out something like 15A but it required a 30V input and it was a too much low current. can you link me an image of a circuit that's able to do what I want?

Topic by andry08   |  last reply

i can not asertain what these are ( ic's microcontrollers or processors)

I can not ascertain what these are ( ic's microcontrollers or processors) one chip is 42 pins total and reads qh7-8163-02 (9509 Z08), the next one is sc34205-154sp (851104) it has a total pin count of 54. and lastly I have a Mitsubishi m54571p. I can find some information on them when I search but not a data sheet that I can use. if anyone has any insight on how to find what they are and their data sheets I would appreciate.

Topic by CD_tatro   |  last reply

Arduino Floppy Music: Random .mid doesn't work properly

Hello :) I use a Arduino Mega  2560 and 3 floppy drives. If I start one of the example songs then the 3 floppy drives work. But if I convert a random song in .mid and play it only the first floppy drive will work... I changed same settings ine the MoppyDesk but it didn't work. Can you help me?

Topic by JaniJPK   |  last reply

Arduino Leonardo with Flex Sensors

I am trying to build a flex sensor gloves that acts as the input and translate the bend of the flex sensors into output in the PC. But it seems i cant get the coding right. I am using the Arduino Leonardo as my microprocessor. Creating atleast 3 input which operate the right, left and up button to be used in a basic car game. Anyone can help me constructing this project? Thankyou. Appreciated.

Topic by AzrilA   |  last reply

Arduino Quadcopter[HOW TO BUILD IT?]

Hello Instructablers! I have a problem. I am a 17 years old dude, that loves making movies and photos. Recently I bought an arduino to expand my knowledge a bit, but it turns out its pretty hard to make anything with it as I am a mechanic. My idea was to build a quadcopter or anything that can fly, with these must-have features: 1.IT HAS TO BE CAPABLE OF STEADY FLYING. 2.IT HAS TO HAVE ENOUGH POWER TO CARRY A GO PRO AROUND WHILE FLYING. So, as I am a beginner in adruino and programming, I would need some tips, maybe from someone that built their own arduino flying..thing. I would like you to help me a bit. If someone could lend me the whole script, and tell me exactly what I need to get, it would be awesome!! thanks!

Topic by dsirotic   |  last reply


Hey guys, im in the process of making a UV LED Light Box for PCB making, im planning on using an arduino nano. the picture is how i plan to wire everything (i used EveryCircuit btw) but i cant seem to make the circuit work in real life, any advice? thanks in advane

Topic by Rafael_RMoreira   |  last reply

Help Needed: How to use Arduino to Power a Motor and 4 PIR Motion Sensors as Switches?

Hello all! I am in need of help. I'm making sculptures that I want to rotate when people walk by. The sculptures will be about 4 1/2 feet tall but light, about half a pound. I want them to spin slowly, around 1-2 rotations per second.  I am hoping to use an Arduino to power a DC motor (or a stepper motor is ideal because it's easier to find one with a flat bottom, but I understand it's also more electronically complicated). I want to use four PRI sensors (one on each side of a square base) as switches to turn on the motor when people walk by. I want to code the Arduino to turn off the motor after about 7 seconds, and the turn it back on if the sensor is triggered again.  I am open to suggestions on every level of this project, including which materials to use, schematics, battery power and code. I've been messing around with it for a while, but I basically feel like I need someone to walk me through it. I've gotten one PRI hooked up to work, but I have no idea how to connect a second, third and fourth, or how to plug it all into an external battery source (a motorcycle battery, a gel cell battery have both been suggested to me, but I'm worried that might be too much power?) Currently I have an Arduino R3 Plus, Osepp and Raspberry PRI sensors, a 12V DC motor, a 12V stepper motor and various other wires and resistors to hook it all up.  Do I need a larger Arduino? What kind of battery power do I use? Any help you can give me would be so Appreciated!!  Thank you very much,  Nicole

Topic by Bennett88    |  last reply

Strong coil spring

Hi, I want to build a rotating mechanism powered by a spring. Once released,I need the piece to make 2 rotations in a fraction of a second. I also need it to be quite powerful since it will have to push another piece. For this application, I believe that a coil spring (such as those we can find in clocks) is the best suited, but will it be powerful enough ? An if I use a torsion bar spring, the problem is that I probably won't find one that can make 2 turns.... they are usually designed to be used on small angles only. I would be glad to have your advices ! :)

Topic by 1tibo2.   |  last reply

Need schematic: 60-LED analog seconds-only clock

I built a "barn-door" tracker to take photos of planets and stars so that they are tracked (i.e they appear as dots, not trails). See if you want more info about  trackers of this type. My tracker can be seen in the first two photos here: These devices depend upon the user manually turning a knob at exactly one rpm for as many as fifteen minutes. This is (very) tedious, but gets good results. The biggest difficulty is in keeping the proper rate of knob-turning. I use a stopwatch timer and have a pointer on the knob so I can manually match each second as it goes by. This has to be done in the *dark*, though, for obvious reasons! So there's an additional problem of lighting the dial and stopwatch. My idea would be to affix a steady red LED to the end of the knob pointer and to use an analog clock consisting of 60 red LEDs arranged in a circle around the knob. Only one LED would be lit at a time, starting at 12 o'clock position, and advancing one LED at a time, clockwise, and keeping each LED lit for one second. This arrangement would let me simply match the knob's steady LED with the currently-lit one and thus makes manual matching of the "second hand" visually easy. I expect a 555 timer circuit (powered by battery, not A/C, for portability) could handle this task, but I don't know enough about electronics to know for sure. I'd like to keep the cost lower than it would be if an Arduino-based circuit were used. I've also never made a custom printed circuit board, but I'm game to try after building a successful breadboard. I just need a schematic!  Thanks, all.

Topic by tjerome   |  last reply

Arduino racecar dashboard help

Hey guys and girls. I'm hoping i can get some help here. We're building a race car as our project and were at the stage of needing a dashboard and the electrics. Now i know there are a lot of different units out there that run on the OBD/ CANBUS system but our car doesn't use it (our motor and gearbox is mid 80s with carbies and such) My problem, I have absolutely no experience in coding or Arduino, i've read multiple books and tutorials but there's still a lot that my brain doesn't understand (i guess there's a difference from copying someones code and writing it yourself) I know exactly how i want the finished unit to look like and what i want but i just cant work out how. What i need *An accurate tacho *Accurate speedo *Oil pressure *Engine Temp This all needs to be in a display form that is easy to read be it either one big LCD, an android tablet or a mixture of LED and LCD displays Any idea where to start with this? Thanks for everything

Topic by jjefferson1 

can this robot walk ? [tars project]

Hi, I have this project to build a Tars (Interstellar) robot and I´m trying to make it walk. I made this styrofoam model and explained it in this video: Can it work ? Can you see some problem ? *Can´t test because I have 2 servo controllers right now and waiting the others to arrive *The video is in portuguese, if you want, I can make another one in english.

Topic by converge_br   |  last reply

Help with an Idea to hack Amazon Echo Alexa for robotics

Hi Everyone! I have been consumed with the idea of using an Amazon Echo as a foundation for a robotics project.  It has a simplistic IFTTT command ability which would make great functionality for a robot.  There are lots of simple on off switches already compatible with the device.  The Echo is cloud based and constantly learning so the voice cammands will be come more and more streamlined over time.  It already is wifi and bluetooth enabled, can play music and search the web for you.   My idea is to add mobility.  I don't know if I will ever attempt this but I am intrigued to see what we can come up with.  Using RFID tags to identify people in my home, I can imagine easily telling Alexa to come to me or to do certain activities.  Set alarms for reminders to take medicine and then bring it to you etc.  I just feel like this allows an easy leap for some home robotics.   One idea is to marry it to a Roomba so it has other functionality.  Add a wireless video camera.  Keeping it as "off the shelf" components as possible would be great.  I don't know where I am headed with this but I would love for others on here to chime in and put in their two cents worth.  Thanks for reading this and I hope to hear from some of you.   update:  I'm thinking of making an Instructable from what I've learned so far. instead of posting add ons here in comments.

Topic by sosclosetsandfurniture   |  last reply

Is it possible to transfer data via magnetic induction between two coils separated by a steel plate ?

Is it possible to transfer data via magnetic induction between two coils separated by a thin steel plate of 2mm ? Or does the magnetic field gets diminished by the metal plate?

Topic by ZZamorin   |  last reply

Arduino with solar panel

How can I charge 12V Li-ion or lead acid batteries using a solar panel? I also wish to interface the three, i.e. the Arduino, the solar panel and the battery, together so that the Arduino is basically driven by the battery but as the battery discharges, the solar panel would charge it. What circuitry do I need? Also tell the specifications of the solar panel.

Topic by DeepayanB2 

What graphics for gta 750 4gb or 950 2gb

Hi I need help my friend wants to build a PC but I can't choose between a 750 Ti or 950 2gb he will mostly play gta 5thanks for replying which needs a lot of memory 

Topic by paul the maker   |  last reply

Higher efficiency (high amp) 12V regulator alternative to 7812

I need a high efficiency 12V DC regulator to supply my thermoelectric modules (they're very inexpensive so I had no choice but to use them). I found that the modules are most efficient at 12V @ ~7A each. I could use many 7812s in parallel but they are too inefficient and too much energy is lost to heat. Is there any alternative? Electricity bills are going up so it'd be very good if I can find an extremely efficient step-down or step-up regulator, short of using an expensive 'gold standard' ATX PSU (which are usually upwards of 500W so the power savings don't matter).

Topic by arikyeo   |  last reply

Help Making Tattoo Lab Power Supply Jumper / Converter + pic

This is what I'm talking about. can you see it?  it's the first thing that comes up on google image search when you type in "lab supply jumper." It's so you can plug in a tattoo machine and foot pedal into a lab power supply.  theoretically I get how it's working.  The foot pedal is what interrupts the circut.  when you press the pedal down, it makes contact and completes the circuit.  So, the machine needs to be routed through the pedal before getting power from the power supply (versus plugging the machine directly into the PS itself.  Cause then you'd have to turn the PS on and off to get the machine to work or turn off). So, I'm assuming that's why there is a cord going from the "machine" 1/4 terminal to the "foot pedal" 1/4 term, right?  Then the pos and neg banana plugs go into the power supply. specifically, my question is this:  do I have to solder to make this?  or can I just twist wires together?  and can I buy everything I need from radio shack, right?  I'm pretty confident I can do it either way, just need a diagram or something on how to wire everything. I'm also asking my brother who was an electrician before getting injured on the job- he's on disability now but may be able to help, too. =) It's gotta be easy to make, right?!?!  so help me do eeettt!!!  =0) thanks for any and all help!  Sarah ps- I attached a pic of the power supply I have so you can see it as well. and for the record, my tattoo machine is RCA not clipcoard, but goes to a 1/4 male mono all the same.  As well as my pedal. k, thanks. ;0)

Topic by crumpitt   |  last reply

keep getting a short when I connect a peltier module to DC power source

I am trying to power a peltier module (3.9V 9A 21.3W). I have connected it to a DC power source at 3v and I keep getting a short. I have tried different voltages below the 3.9V and am still getting the same result. Am I approaching this at too basic a level? 

Topic by suzanneocallaghan   |  last reply

Powering Peltier Plates

Hey guys,So, I just got a Peltier plate, a device that gets very hot on one side while very cold on the other. It requires 90 watts of power. I was just curious what would happen if you powered it by USB or 9v battery. I found this tutorial which uses USB, however, I doubt it gets to its maximum coolness potential. Also, if I used a 9v, would that drain the battery in a matter of minutes, or even damage the plate?Thank you.

Topic by Joe426   |  last reply

Low pass filter on LED Music Controller

I've purchased following controller: I was wondering whether it was possible to create a lowpass filter with potmeter, so that the LED only will be changing to the low frequencies?

Topic by FrederikH5   |  last reply

switch to control dc when ac is turned on?

Hi i've got a arduino project on the go and when my arduino switches on a relay to operate a 240v ac motor, i also want it to turn on 24vdc motor. I know i could just use another relay but i'm not wanting to power the relays separately, just want to power the aurduino, and yes the board might be able to power two relays but it's pushing the limits i think.  I'm not to sure if this is called a reed switch or even if there is something like what i am after available?  

Topic by JonathanM221   |  last reply

Making your own digital assistant using ardino uno gsm shield Sd card module and VR shield

I am building a personalized assistant or a daily smart reminder sort of which speaks to you. Using the Arduino R3 and GSM Shield: SMS will be sent to the SIM card in the GSM shield connected to Arduino uno and the data fro the SMS will be extracted and stored on the SD card which will be displayed on an LCD screen. All of this will be voice activated and controlled.  Need help with the logic and working of this setup.

Topic by shreyansoswal   |  last reply

Using a 3.5 tt screen to display speed from a laser chrono set up

Timing a school project - my CO2 powered car (like this ) I have written a code (well..copied and edited) that will measure a drop in reading on a LDR from a laser as my dragster moves through the speed trap beam, starts a timer and then stops time when a second laser is crossed 100mm away. The code calculates the speed (average) over the 100mm. I am using 2 analog inputs for the LDRs to read from. Works well using the Print Monitor. I would like to place this onto a track and have a tft screen display out the speed but are having trouble working out how to do this. Any help would be great. I have purchased the following equipment: 2.4inch TFT and a 3.5inch TFT. A Uno, Mega and Due boards. My preference is to use a Uno board and the 3.5 screen which plugs straight into the uno. Both fit straight onto the Uno without any wiring. Only problem is there is only 1 analogue channel left when the TFT shield is on for the uno. Can I use one of the TFT pins for my 2nd LDR input? I have been looking at writing code to make a simple 2 line read out - "Dragster Speed is...   XXX KPH". Current code (which prints to a serial monitor currently) below. Would love to know how to make this print out on a 2.4 or 3.5 inch screen. I have attached pictures of my 'basic' set up. int firstsens = 4; int secondsens = 5; unsigned long time, time2; float kph, elap; int val; int val2; void setup() { Serial.begin(9600); pinMode (firstsens, INPUT); pinMode (secondsens, INPUT); } void loop() { Serial.println("Waiting for Co2 car to launch...."); val = analogRead(firstsens); val2 = analogRead(secondsens); while (val > 200) {   val = analogRead(firstsens); } while (val <= 200) { time = micros(); val = analogRead(firstsens); } while (val2 > 200) {   val2 = analogRead(secondsens); } while (val2 <= 200) { time2 = micros(); val2 = analogRead(secondsens); } elap = time2 - time; kph = (elap*1000)*60*60; Serial.print(kph ); Serial.println (" kph"); }

Topic by PhilB68   |  last reply

Coil Gun

Hello! I have a question. I have been looking at making a Coil gun lately and i had an idea for a simple one. Just need to know if it would work. Basically: Battery-->Switch-->Diode-->Transformer-->Coil For my Coil I am using a coil from a Pinball Machine Flipper. Just An Idea for makers of a coil gun.

Topic by BionicB   |  last reply

Cheap Arduino Drone Project

Hi there  :)  , Right now, I am busy on a project, called "The HoboDrone" to make a cheap ass drone. It is my intention to make a DIY guide for everyone. The next problem that need to be solved right now in my project, is to process all information that comes and goes through this drone, through the Arduino. My question is if it's possible that an Arduino handles next tasks/can deliver enough CPU-power for: - Reading the sensors - Run the code to stabilize the drone - Control the electromotors (output from stabilizing code) - Get input through RC-signals and control the electomotors I did not start writing the code for stabilizing the drone, but there are plenty of examples out there, like the bluecopter: (This code doesn't deal with RC-input from a controller on the ground) I have read a similar DIY project which used a Raspberry Pi, which took care of a part of the code. ( Is it possible to only use an Arduino in a Drone, or should I work in the direction of a coöperation between an Arduino and Raspberry Pi ? Thanks in advance!

Topic by Prestigious_Hobo   |  last reply

Ground Penetrating Radar

I am looking for any information regarding Ground Penetrating Radar (or GPR). I am a newbie to this type of tech and was hoping the someone may know of a basic reference manual or other sources that could contribute to building one from the ground up at reasonably little cost. Also, I am looking specifically for something in the high frequency range - good resolution at minimal depth. The hardware side is more important although any advice/resources on the software to interprete the data wouldn't hurt. Thanks in advance! By the way, my user name(just created and second guessed) has nothing to do with being dug on digg, or anything to do with digg for that matter - just thought it had a nice ring to it... Thanks!

Topic by diggity   |  last reply

i want to start and stop my line follower robot robot by blutooth

Please help me , i have no idea how to change it. i have line follower robot , and i want to operate my robot by blutooth , i want start and stop my line follower robot by blutooh ,my line follower robot code is //code is int rightmotor1=12; int leftmotor1=13; int rightmotor2=9; int leftmotor2=8; int sensorleft=5; int sensorcenter=6; int sensorright=7; int l1=1; int l2=1; int l3=1; int f1=0; int f2=0; int f3=0; ////////////////////////////////////// void setup() { pinMode(rightmotor1,OUTPUT); pinMode(leftmotor1,OUTPUT); pinMode(rightmotor2,OUTPUT); pinMode(leftmotor2,OUTPUT); pinMode(sensorleft,INPUT); pinMode(sensorcenter,INPUT); pinMode(sensorright,INPUT); } /////////////////////////////////////////////////// void loop() { l1=digitalRead(sensorleft); l2=digitalRead(sensorcenter); l3=digitalRead(sensorright); ///////////////////////////////////////////////////////////////////// if(l1==1&&l2;==1&&l3;==1)   //feedback when comes all sensor on white { l1=f1; l2=f2; l3=f3; } //////////////////////////////////////////////////////////////////////////// if(l1==0&&l2;==1&&l3;==1||l1==0&&l2;==0&&l3;==1)   //left turn {   digitalWrite(rightmotor1,1);   digitalWrite(rightmotor2,0);   digitalWrite(leftmotor1,0);   digitalWrite(leftmotor2,0); } else if(l1==1&&l2;==1&&l3;==0||l1==1&&l2;==0&&l3;==0)  //right turn {   digitalWrite(rightmotor1,0);   digitalWrite(rightmotor2,0);   digitalWrite(leftmotor1,1);   digitalWrite(leftmotor2,0); } else if(l1==1&&l2;==0&&l3;==1)  //go forward straight {   digitalWrite(rightmotor1,1);   digitalWrite(rightmotor2,0);   digitalWrite(leftmotor1,1);   digitalWrite(leftmotor2,0); } else if(l1==0&&l2;==0&&l3;==0) //stop {   digitalWrite(rightmotor1,0);   digitalWrite(rightmotor2,0);   digitalWrite(leftmotor1,0);   digitalWrite(leftmotor2,0);   delay(2000);    digitalWrite(rightmotor1,1);   digitalWrite(rightmotor2,0);   digitalWrite(leftmotor1,1);   digitalWrite(leftmotor2,0);   } /////////////////////////////////////////////////////////////////// f1=l1; f2=l2; f3=l3;        //memory variables //////////////////////////////////////////////////////////////////// } , i want to keep all code in function and want to call in blutoooh code i want my robot start and stop by blutooth please help me my blutooth code is #include SoftwareSerial mySerial(10, 11); // RX, TX String state;// string to store incoming message from bluetooth int  LED = 5; // LED on pin 13 void setup() { mySerial.begin(9600); Serial.begin(9600); // serial communication to check the data on serial monitor    pinMode(LED, OUTPUT); mySerial.println("Welcome to the wonderful world of bluetooth communication");   delay(1000);   mySerial.println("Sending a '1' will turn on the LED, Sending a '0' will turn off the LED");   delay(1000);   mySerial.println("a '3' will flash the LED and a '4' will kick out a lot of data from the LDR"); } //-----------------------------------------------------------------------//  void loop() {   while (mySerial.available()){  //Check if there is an available byte to read   delay(10); //Delay added to make thing stable   char c =; //Conduct a serial read   state += c; //build the string- either "On" or "off"   }    if (state.length() > 0) {     Serial.println(state);   if(state == "turn on")   {     digitalWrite(5, HIGH);           }     else if(state == "turn off")   {     digitalWrite(5, LOW);      }      else if(state == "turn1 on")   {     digitalWrite(5, HIGH);           }     else if(state == "turn2 off")   {     digitalWrite(5, LOW);      }     state ="";}} //Reset the variable i am using arduino atmega2560 and blutooth hc 06 and using  l298n 3 sensor

Topic by ShaidK 

Boosting Fm transmitter range

I bought a FM transmitter for an ipod. I would like to boost the range of the device. (I know it is illegal but would like to get more range than 2 feet.) I think I need to build an external antenna but need to know where to hook it up to the thing. The transmitter I have is a ge FM transmitter for ipod.If anyone has done anything like this or have any useful links it would be great. I don't know anything about circuit making so help would be great on that as well.

Topic by thejrb   |  last reply

How many LED's can the Arduino PRO mini run?

I need to design a programmable flashing light source for small models. The Arduino PRO mini looks perfect, but how many white LED's can I run on an Arduino PRO mini 5v? Am I right in thinking that a 3.3v mini will not power them? I would like to use at least 3 LED's but 6 would be great. It will be powered by either a 9v, or coin cell battery if I can use the 3.3v version. I assume I can only use the coin cell on the 3.3v version, but use a 9v battery for both versions as long as I connect to the RAW input is that right? Cheers.

Topic by lifeofB   |  last reply

How do I get Notepad up?

Okay. So apparently, my school has figured out how to keep you from deleting the source from web pages so you can use the empty source thing as notepad. Does anyone know any other way to get notepad up? The regular notepad program is blocked too.

Topic by mbudde   |  last reply

3D or correctly 2.5D engravings on wood with a CO2 laser

Due a lack of correct forum sections I just post in the tech department, hoping the right people will find it ;) I did some tests with my CO2 laser cutter to find out how good or bad it works for 2.5D engravings. Turns out not too bad really. But during those tests I often noticed that I have areas where the wood is burnt while in areas with other power levels the wood is vaporised without charring, looks totally clean. So of course this meant further investigation on the topic but to my surprise my Google skills seem to get rusty as I could not find anything of use. As I am still planning to do a full Instructable on the topic of 2.5D engraving it was time to do more detailed tests myself. My machine uses an Arduino Mega as the controller, running on a modified MarlinKimbra release, so I had no problem adjusting all required parameters. Here are some of my findings so far: Once the power levels are high enough to do real damage to wood instead of just darkening it, there are levels that just vaporise the wood. I did not test the full power range but there seem to be several "sweet spots" for the power, above and below the wood will be burnt instead of a clean vaporising. Next step was to check this behaviour with changing PWM frewunecies for the laser firing. Started with a know power level that vaporises and adjusted only the PWM frequency. Lowering the frequency soon caused charring, increasing the frequency had very little effect. Next was a lower power level that with the original PWM frequency would charr the wood. Here lowering the frequency caused more charring, at quite low frequencies to the point that the kerf suffered massively. Increasing the frequency again allowed to find a sweet spot where the wood would vaporise rather than burn. So I am wondering if anyone else has done tests in this regard or knows of any links with more info?

Topic by Downunder35m   |  last reply

help arduino help please

I need help adding a manual momentary switch to this sketch to control the same pin as the network button any help would be greatly appreciated i couldn't figure out how to post code properly so i attached the example i'm using in zip format pretty much i need to add a momentary switch for on off to living pin in the example without losing the control from the network on the same pin its controlling my lights i just want a button to control them manually and from browser

Topic by vapasaurusrex   |  last reply

Arduino IR remote to set a value

Hello, I'm new here I'm using an Arduino UNO with a VS1838B IR receiver and a remote control, I can receive signals perfectly and decode them, but I want like if I press a button, it's value goes to a variable, example: if I press "button 5" then an "OK button" a variable A=0 become A=5.  Thanks

Topic by AYassineLebouiha   |  last reply

Outdoor listening installations

Would appreciate some advice on this project.  I'm putting together a proposal for a series of outdoor sound installations in a nature park.  a couple of the installations will be places where you can plug in headphones to listen to certain sounds captured live from a microphone in an interesting place- for example a hydrophone in a pond.  The plan is that the mic will be hooked up to 3.5 jack sockets and listerners will be able to plug in their own headphones.  Now obviously there needs to be some amplification because the mic signal level will be far too quiet to hear on headphones. I need a power amp that will be powered through a solar panel.  My question is, shall I just use a headphone amp, like the Behringer ha400 or make my own power amp circuit? I need to be able to make everything sturdy and fit into a weather proof junction box to protect it from the elements. I have done some experiments with an LM386 power amp module but there was so much background noise and it didn't pick up the mic level at all (may have been a problem with the mic I was using,it was a crappy little lapel mic.- I did get a signal from a piezo disc but it was again really crackly and noisy.)  If it is best to build a circuit with a power amp module, could people make suggestions of ones that will sound good and clean, and work with stereo headphones.  Thanks a lot Ash

Topic by AshtonM4   |  last reply

Arduino - 2 wire fan

I have 2 wire fan (5V 0.15A) and I want to connect it with arduino board. Is it safe to connect it directly to arduino? And if it's not how to control the fan? Do I have to put some resistors?

Topic by dkorisnik   |  last reply

Lithium Ion Battery Shut Off

Hi, my name is Jackson Pugliese, and I am currently building a battery pack that will be consisting of multiple lithium ion batteries. Getting the pack itself together, is not an issue at all, however, what is an issue is battery shut off when charging.  I would like to be able to charge my battery pack with some form of laptop charger, that outputs 12v, for a 14.8 volt lithium battery pack. The main issue is overcharging. Lithium ions explode, or catch fire if they are over charged, and thus is not an option for me, so to find a solution, I searched the internet, and two things came up.  Option one, use some form of battery charger, that automatically shuts off when It is fully charged (which i do not want to do because I want to do it differently hence the instructable) And Option two, which came up alot, but i do not fully understand is I use something such as this;=1456701414&sr;=8-2&keywords;=protection+circuit+module+14.8+volt I do not understand what it truly is, nor how to use it, and would like someone to explain to me both of those things. Everything I am doing is safe, because I am using a en closer for lithium ions, in case if they explode or catch fire, so know one has to worry about anything not working. Thank you very much everyone for your time, and have a wonderful day!

Topic by merlinj   |  last reply

My First Project (Electronic Questions)

Good morning everyone. I'm new but very optimistic on the creation and programming in PIC and I would love Buddy aid for my project. Project Idea: Store 60 responses at most 1 character (núemro or letter), to questions such as: 1 = 2 = 3 = 60 = .... At the end of the data / informed responses would be sent to the PC via USB cable or WIFI for later imported by the PC system. My questions prior to starting the project would be as follows: I'm thinking of using PIC16F877A microchip and NOKIA5110 screen. A) Any other microship less expensive cases do this activity? B) The screen initially want to use this model because it allows me to print graphs on startup and letters larger than 16x2 screens. The following outline of the design for greater understanding.

Topic by clicsis   |  last reply

Using Raspberry Pi (running Openelec) to turn off TV and Amp when idling.

Hi, I was hoping that you guys might be able to offer some advice to this problem (have looked everywhere and cannot find a possible solution). I have a Raspberry Pi 2 (running Openelec) connected to a TV via an A/V amp. Is there a way, whereby whenever the Pi hasn't been used in a while and goes into a lower power state, it can cut the power to the TV and amp?  The point being that I can then leave the Pi on all the time and simply press the remote to have the TV and amp come on automatically. I have considered power saving power strips but I am not sure that the master socket would work with a Pi because of the small change in wattage between idling mode and full power. The only possible solution I have found so far is somehow to use these: However, am I  correct in thinking that Energenie only works when you are using the Pi as a dedicated home automation solution? I would be so grateful for any help. Thanks

Topic by elsmandino 

removing power supply noise from my bluetooth speaker

Hello guys, so i made this bluetooth speaker and when i hook everything up and runing i get this weird noise from it im pretty sure it has something to do with the voltage step up but im not sure how to remove the noise would be great if you could help :)  yeah yeah i know the schematic is pretty epic, lets pretend that the two amp audio input and bluetooth dongle audio output are connected, and ignore the fact that there are no switches and stuff like that pretty sure thats not hwat causing the noise.   i know that theres a way to remove noise by using capacitors but i dont really know how to use them. thanks for tips :)

Topic by VytasŽ   |  last reply

Digital Picture Frame How-to Building Guide

Digital picture frames are a really popular gift project here on Instructables, and lots of people are searching for digital picture frame how-to's. So, here's a guide to some of the best digital picture frames we have:Cheap 'n Easy Digital Picture FrameTotal cost was under $100, and could be substantially less if you're savvy.Digital Picture Frame Numero Dos!I made this as a wedding present for a very good friend of mine, and I think it turned out very well. Granted the cost of digital picture frames have come down significantly in the past year alone, but that wouldn't be handmade, customized, or particularly interesting to read on, now would it?Hanging Laptop Digital PaintingTake your old laptop, matte it, frame it, and convert it into a hanging framed digital lcd screen to do with as you like.YET! Another Digital Picture FrameAll Picture frames i have seen are nice, but I wanted something else: A really nice frame (custom made and that's ain't cheap), a nice size (14.1") and with some "extras" (wi-fi, bluetooth, etc). This is a brief description how to disassemble a notebook and assemble a nice digital frame.DIY Digital Picture Frame (the easy-lazy way)Inspired by the "12 dollar digital picture frame" on, I bough the Jukebox from Ebay and the connectivity kit from K-Mart. At a garage sale, I found just the type of frame I needed: one that would fit the Jukebox and the SD card INSIDE it.Find more digital picture frames using the digital picture frame keyword.

Topic by ewilhelm   |  last reply

PC speakers to car speakers?

Hi everyone, I am at a dilemma, I have 2 old PC stereo speakers, and since the rear set of speakers in my car are broken, I was thinking it was an easy transplant. However, when I took them apart, I saw that these speakers are 9V, and the car ones are (obviously) 12V, so I was thinking if it is going to fry them right away, or is it going to sing for some time and then fry them OR if it is going to be just fine. Also, these are a bit smaller (65mm in diameter) than the car's original ones, and since they are a generic brand and have no wattage rating inscribed on them, I am thinking that they require less W to power. Since the car ones are about 50W and my stereo can supply 4x50W, would that cause a problem one day if i uknowingly cranked up the volume, would that fry them aswell? I am not using anything big, just a simple stereo, with a simple output, no special equipment whatsoever. Thanks ahead everyone! EDIT: I just looked and found an inscription on the transformer in the back of the main speaker: I/P 240V ~50Hz O/P 9V ~500mA That gives me like, what 4.5W? Is that each or altogether? I am thinking these are too old/weak for this :o

Topic by vzupčević 

A few LED questions

I want to build an aquarium light using these modules  Do I need an LED driver or can I just attach a 12v power supply of the proper wattage?   How would I go about joining two or more of them?  I have wired LED strips but have never worked with these tubes.

Topic by cynthia.mcginnis1   |  last reply

Software for Make: It robotics starter kit? (Radioshack)

I Just recently made the Arduino-based  walking robot sold in a robotics starter kit by radio shack. The software link that came in the instructions is no longer a valid domain. Can anyone help with this? Cant find the arduino software anywhere. I would really appreciate any help. Thank you


if/else Arduino code

So I need a little help building some if/else statements. I went to the Arduino website but there wasn't a whole lot of information there. I need some help with reading analog input and reacting to them. I'm not totally sure how to use the == either, I know it means do something if one thing is equal to, but. . . Also, with the if/else, I need some help with using >= => (i think??) as well as true and false. I also think you can like use two different if statements and only one else. Could I get a little assistance from you guys!? Here's an example: if(analog_in (is less than) 5) {  do something here  } else {  do another thing here } Here's another example: if(analog_in (is equal to, I think ==) 5); {   analogWrite(LED, 100); } if(analog_in (is greater than) 5); { analogWrite(LED, 255); } if(analog_in (is less than 3, but greater than 1); {  analogWrite(LED, 50); } and if none of that is true, then do this else {  digitalWrite(LED, LOW); } So you can see I need some help!  Thanks!

Topic by HavocRC   |  last reply

Advice; How to convert a smoke detector to use a recorded message

Hi, First gentle! Trying to find someone to guide me through converting a normal, off the shelf, home smoke detector so that it emits a pre-recorded message, rather than the usual siren. Anyone? Thanks Naldo

Topic by naldo58   |  last reply

K40 Chinese laser conversion to Arduino

After fixing most of the issues on cheap laser cutter I am about to do the next step and install an Arduino board to get rid of the dongle and crappy controller. I also would like to put this in the form of a nice Instructable so others can upgrade their machines as well. But during my research I noticed that several different versions of the controller, laser power supply and control panel exist. If you are interested in upgrading your machine so you can use Inkscape directly and no longer need a dongle and crappy software: Post a pic of your laser power supply (including a clear pic of the connection terminals), a pic of your control panel (both from the outside and the bottom), let me know if you already have safety switches for the lid and water flow. Everything posted here in time will be included in the Instructable if it is different from my machine. Once the Ible is finnished you will get detailed instructions on what you need, how to program the Arduino, get the plugins working in Inkscape and how to do your first real engravings and cuttings on the new setup after calibrating everything. Here is a video showing raster and vector engraving followed by cutting the piece out - what more can I ask for if only spare parts are used? ;)  

Topic by Downunder35m   |  last reply

Help with Viewfinder Pinout??

Well guys, I've had this viewfinder sitting around in a drawer for TOO long. I ripped if off an old camcorder in the dump like 2-3 months ago, remembering a few different projects I've seen on here (and other sites) such as: (sorry the hyperlink part of instructables never works for me) I know I've seen a project somewhere online too where a guy used one of these TINY crt's for a miniature arcade machine, just to name an example. I've ran into a bit of a wall here though, it would seem as though everyone else's viewfinders have indivigual wires coming off the board for power and video input. Mine doesn't, it has ONE ribbon connection (although mangled a bit, I still have the ribbon cable that goes with it). This is a really simple looking circuit board, but as I don't exactly have lab quality tools sitting around, I don't wanna solder wires onto it until I know for sure which is for power, I'd hate to fry it on the first time! I tried following the traces on the board but I've never been too good at that, is there some way I can probe around with a voltmeter to determine what is for video input and what is power? I've tried googling numbers off the board and tube and that didn't help either. If anyone can help me power this tube, please tell me!!

Topic by Punkguyta   |  last reply