Instructables: question - arduino Wed, 26 Nov 2014 08:31:45 PST BLOX v1.01 arduino, servo + external power: ground to arduino, double power's runtime? marc_is_curious hope you may have a spare second to send an input & looking forward to your reply! ----------------------------------------------------------------- ----------------------------------------------------------------- arduino, servo + external power, potentiometer, switches ground to arduino once i c...
By: marc_is_curious

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Tue, 25 Nov 2014 19:50:39 PST
What are some compatible displays for Arduino Uno? SuperScourge I'm gonna create a little half scale Arcade machine (out of cardboard if I can) just for fun so I can know how to code the screen but I don't know what displays can work for the Arduino Uno and I've found one at Sparkfun which is the touch one for it but that's too Expensive! So what are some displ...
By: SuperScourge

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Sun, 23 Nov 2014 22:53:00 PST
How do I play a song from my computer using arduino? jvan27 Hello! I am a maker beginner and I need some help!  :( I am trying to make a device that detects when it is moving and then plays a song from the computer. Right now I have an accelerometer from adafruit which is attached to the adafruit flora. the information is being displayed through the serial ...
By: jvan27

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Sun, 23 Nov 2014 21:28:22 PST
My coding in Arduino has an error? adriana.massie.9 I got a robot kit form Radio shack and I had the choice to build the line following robot or the walking robot. So i built the walking one. I download the program(Arduino) and everything. So when i click the verify button and error thing comes up. It tells me that"MakeItRobotics does not have a name...
By: adriana.massie.9

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Tue, 11 Nov 2014 13:01:24 PST
RFID or Smart Card Cashless Payment System? 7_7 Hello! I was wondering if it was possible to make a cashless (apart from adding funds) payments system. I was thinking it could be done with an Arduino and RFID reader/writer OR smart card reader/writer. The balance would be stored on the card (AFAIK data can be stored on the cards) and when the pe...
By: 7_7

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Mon, 10 Nov 2014 11:22:55 PST
ESP8266 wifi module data logger? Akin Yildiz ​hello everyone, can anybody do a simpler project with this? I just want to collect data using arduino Analog0 input with an LDR photoresistor. collect the data and simply post it on Thingspeak ?!?! . all the examples I find are very complicated and include libraries. I need my project to be much si...
By: Akin Yildiz

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Mon, 10 Nov 2014 10:14:41 PST
Help with Capacity and Inductive Proximity Code for Arduino? charlie.spells I am a beginner. I'm trying to figure out what wrong with this code. The project is suppose to turn a servo motor left and right based on which sensors are active. Capacity Sensor (cpsensor) and Inductive Proximity Sensor (ipsensor). Here is the code:                                               ...
By: charlie.spells

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Fri, 7 Nov 2014 02:01:50 PST
Counting Heartbeat with Arduino: Help with Code? DangerousTim I got a premade heartbeat sensor which uses an IR led and an IR receiver to sense heartbeat. It gives out an analog signal, which i have connected to my Arduino's A0 pin, and uploaded the analogRead sketch to it(sends values to serial port too). Then to visualize the heartbeat i used a processing ...
By: DangerousTim

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Wed, 5 Nov 2014 23:03:28 PST
PIR DC Motor? Josh_Lucas Hi all, I am trying to set up a dc motor controlled by a PIR sensor using an arduino.  When the PIR sensor is triggered, I would like the motor to turn on for half a second and then off.  However, no matter what "delay" I write into the sketch, the motor always stays on for around four seconds.  Co...
By: Josh_Lucas

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Tue, 4 Nov 2014 04:29:09 PST
is it possible to connect an xBee to 4 servos and a tank chassis and control it on a computer? ibenkos Im building an RC tank whit an 4 dof robot arm on it, can I control the whole thing on my computer using an xbee on my tank and one on my computer? and if so what do I have to download on my computer to control it?
By: ibenkos

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Wed, 29 Oct 2014 16:57:26 PDT
Why does this circuit need these resistors connected to the transistor? seonghoon52 I was following the instructions from the book, "Arduino for Dummies", and worked on this tutorial with a dc motor and it says that I need a 2.2k ohm resistor connected from a digital output pin to the transistor's middle pin. Why does it require a resistor there? Is the transistor not able to handl...
By: seonghoon52

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Sun, 26 Oct 2014 23:59:35 PDT
can one achieve 24vdc scooter motor control using the scooters controller to arduino? schel as above I want to control a 24 vdc scooter motor with an arduino to utiliza all the cool stuff can be done with a MC. I have all the parts except the throttle...hence..the predicament to birth the idea. The control wires coming from the scooters motor control are RED/ BLACK/ GREEN/  YELLOW...easy ...
By: schel

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Sun, 26 Oct 2014 15:20:01 PDT
How to show 3 different temperatures using 3 LEDs connected to a ATtiny85? minimadmalc Hi people I am trying to build a temperature sensor using 3 LEDs. The aim is to have them come on at specific temperatures. This is for my motorcycle ride to work this coming winter. I want to know when the temp goes below 8c down to 5c from 5c down to 0c then below. I have managed to do this via a ...
By: minimadmalc

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Wed, 15 Oct 2014 12:35:12 PDT
I want to make 2 wireless bluetooth microphone&speaker with recording, which are connected each other.. I'm in trouble seyoung.oh1 I'm design student in Korea, I want to make one device for my graduation project. but I have not many experience from this works, just few project with processing, and arduino. my idea is this, but I don't know what should I start from what. can you please please give me some advice  or some referen...
By: seyoung.oh1

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Wed, 1 Oct 2014 04:43:43 PDT
Can I use 741 op amps instead of 1 LM324 in a heart rate sensor? DangerousTim
By: DangerousTim

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Mon, 29 Sep 2014 19:45:05 PDT
Can't get a TLC272IP OP-AMP to work. what am I doing wrong? jm-l Hello I received this week a few TLC272IP op-amp and I wanted to test them. I created a circuit on a breadboard which looks like the attached image From what I read on the net, this is a  typical non inverting amplifier schema where gain should be (1 + R2/R1) I connected PIN 3 of the TLC272 to p...
By: jm-l

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Sun, 21 Sep 2014 10:21:19 PDT
Hi, I was trying to control 10 Leds with the arduino Through the serial monitor, does anybody know how ? Genius 470
By: Genius 470

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Sat, 20 Sep 2014 16:37:17 PDT
Connect USB HP printer to Arduino UNO gastonbr100 Hi, i want to connect a USB printer to an arduino to control it, i know that i can connect a Printer by using the Parallel cable, but my printer only works with usb. Any ideas????
By: gastonbr100

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Thu, 18 Sep 2014 12:31:30 PDT
laser voltage? ludvig.risan i have a laser diode that needs between 3.7v  and 4.2v to run, and i plan to run it of an arduino (5v). to reduse the voltage i have calculated that i need a resistance of aproximately 1.333ohm. is this necessary/is there a bether way to do this? tha...
By: ludvig.risan

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Mon, 15 Sep 2014 11:32:20 PDT
Problem with LCD backlight ade angelis Hello everybody,  I'm here to ask a question I'm not able to solve on my own. I'm not good at programming, so it may be a silly question, but I can't find a solution. I'm building an Arduino based humidity and temperature monitoring system, with three DHT-11 sensors and a display to show readings fr...
By: ade angelis

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Sat, 13 Sep 2014 09:49:58 PDT
can i program a toy car to be an autonomous car? eng.nejm my graduation project is an autonomous toy car . the user specify a destination by his mobile phone and the car must go to the specified destination by it's self. of course the software will be too large , so where the data like maps are going to be saved? what kind of hardware should i use? is it p...
By: eng.nejm

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Tue, 9 Sep 2014 15:21:33 PDT
that piece is this? ualbuquerque Eu quero  construir um  Arduino  e preciso de um  regulador de tensão  entre as peças  que eu tenho esse  é o mais  semelhante ao  que  encontramos  na internet
By: ualbuquerque

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Tue, 9 Sep 2014 06:11:51 PDT
Need Help writing a Star Trek themed Arduino code jamesstills Hey Folks. I really need help  writing an arduino code to control a star trek model i'm working on. I don't really understand programming but I'd really like if anyone can help out. The code is supposed to use 2 momentary switches. When the main switch is pushed it will activate some leds in sequenc...
By: jamesstills

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Sat, 6 Sep 2014 12:53:53 PDT
Trying to use keypad with arduino mega. please help Kirkthepyro I have a 4X4 keypad (the same one they use here: wired to my arduino mega on ports 14-21. I have a piezo on pwm8. I need a program that plays a diffrent note when each key is pressed, using keypad library here:http://playgr...
By: Kirkthepyro

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Fri, 5 Sep 2014 17:04:27 PDT
How to create a loop under a switch (arduino)? ThisIsSteve I need help in creating a loop under a switch command in arduino IDE, I'm new to programming.  void loop() {   if (Serial.available() 0) {      incomingByte =;   } switch (incomingByte){    case '1':    digitalWrite(led1, LOW);    digitalWrite(led2, HIGH); delay(300); ...
By: ThisIsSteve

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Tue, 2 Sep 2014 05:05:08 PDT
how do i start a project using a microphone to cause a servo to "sweep" depending on the sound level? katman101 i really want to make a servo rotate like when using the sweep code but with a microphone instead of a potentiometer. the servo would move depending on the decibel level and return to it's default position once the noise stops. i can code myself but i don't know where to start and i can't understand...
By: katman101

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Fri, 29 Aug 2014 20:18:02 PDT
Random flashing LEDs when using shift registers and turning on the system: how to fix? DoctorWoo I have a setup using 5 shift registers (74HC595s) hooked up to an arduino micro. Everything works great! So much so, that I didn't pay too much attention to the start up issue. When I start up the system (either by hooking up a battery or plugging it into a USB socket) the LED's hooked up to the 59...
By: DoctorWoo

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Wed, 27 Aug 2014 17:15:33 PDT
Wiring a wav playing setup and shift register to the same arduino? DoctorWoo I just ran into an issue with my current setup for a project I've been working on. I would like to hookup a wav playing setup (either the Adafruit Wave Shield or a wav playing setup like this) Issue I'm having is I can't change the pins around for the shift register setup (which I have setup and wor...
By: DoctorWoo

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Sat, 23 Aug 2014 22:22:40 PDT
Question about calling arduino functions? JakeWhelchel So i'm messing with some 7-segment displays and i have a function for each number to display, right now I'm ending up using a ton of if statements to control which number's function is called based on a value, however I wondered if there was a way to output a number or value that would select the fu...
By: JakeWhelchel

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Sat, 23 Aug 2014 12:58:03 PDT
My instructable has 0 View for about 1 day ! ? ram mere Hi, I know this is a common error but what is the solution ?? 
By: ram mere

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Fri, 22 Aug 2014 20:14:25 PDT
Are the JY MCU and the HC 05 bluetooth module the same? TannyPB if not, how are they different? do they works with all android phones? what librabries or software do i use for controlling these with arduino???
By: TannyPB

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Thu, 21 Aug 2014 06:05:40 PDT
Faint LED's while using an Arduino Micro and shift register? DoctorWoo This is more of a "How things work" question, but a question non the less. I have five 595 shift registers hooked up to an arduino micro. Everything is wired correctly, and it all works beautifully on my test bed, all the codes work fine. Only issue is that my LED's are only about half as bright as...
By: DoctorWoo

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Wed, 20 Aug 2014 13:34:13 PDT
How to count the number of the button is pressed and use another button to erase the count. izzaty.anuar I want to know about how to count the number of the button pushed  and how to display it on lcd.At the same time the count can be erase to 0 to start another counting. Is there any sketch or schematic that you can suggest to me?
By: izzaty.anuar

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Thu, 14 Aug 2014 18:15:40 PDT
Integrating a sensor to arduino? naveenkumarmn7 I want to know to integrate a sensor to arduino. I mean how to start and from where to start. I dont want to use existing libraries, I want to create my own. I know the working of sensors and and some other basic stuff.  I want to read a sensor data (for ex: ADXL345), I want to look into the datash...
By: naveenkumarmn7

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Tue, 12 Aug 2014 00:47:42 PDT
Is there a DIY Arduino or Raspberry Pi Coordinate Measuring Machine published in "Instructables"? chestef I wish to build a coordinate machine using x-y-z movements controlled by a microprocessor that can measure a scale model by touch of a probe or by reflection of a microwave.  The base machine would handle an envelope of 8" x 8" x 8" and use one or a combination of the best of the CNC laser cutters, ...
By: chestef

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Sat, 9 Aug 2014 15:44:57 PDT
How can i recheck my connections?What are the general problems regarding Lcd displays? achyuth93 I just need to know regarding the buzzer module ...I have been using buzzer instead of  a buzzer module.Is it fine? ..Although it works fine.And please let me know the general troubleshoots related to LCD displays .I think my circuit's working great except for the lcd part. I am done uploading the c...
By: achyuth93

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Fri, 8 Aug 2014 18:44:24 PDT
Arduino Yun Garage Door Opener? chrisleva I have an Arduino Yun with a Seeed Relay Shield and trying to create a garage door opener.  I have tried just about every sketch available but no luck.  It seems the sketches are for Arduino Uno boards with Ethernet Shields.  I tried that but was unable to establish network connectivity with a W5200...
By: chrisleva

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Thu, 31 Jul 2014 09:52:17 PDT
Whats wrong with the sketch?? Ankan Nayak This arduino robo, there is no servo, this runs only with 2 geared motors, i made the sketch according to the needs bt it doent seem to making those turns even after sensing the obstacle. The ping sensor is functional and connected properly and thel293d ic is also functional..Pls tell me whats wrong...
By: Ankan Nayak

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Mon, 28 Jul 2014 22:37:12 PDT
ITS URGENT! Arduino not working with external power supply? Ankan Nayak I have made arduino uno u3 robot, i have used 2 geared motors via a l293d using one 9v battery and tried power the arduino with a 9v battery, then with 9v adapter but it did'nt work, I also tried powering the board via the Vin pin, also through the usb cable using the 9v batterg and adapter, but it ...
By: Ankan Nayak

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Sun, 27 Jul 2014 06:13:46 PDT
Arduino code help? cmasuo I'm really new to the arduino and I'm struggling to get this code working. I'm trying to have a servo continuously go back and forth until I change its state, which result on the servo to stop at its current position. However, it gets stuck on that for loop and i can't change its state. I assume thi...
By: cmasuo

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Sat, 26 Jul 2014 21:10:26 PDT
Building blocks associated with Arduino 433 Mhz transmitter & receiver ItsDavid001 Newbie here.  I want to make a temperature monitor that will transmit an alert signal to a receiver.  If I use the little 433Mhz  Arduino RF transmitter / receiver modules, what would I need with them?  I know these can be attached to the Arduino programing boards and are made functional by a comp...
By: ItsDavid001

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Sat, 26 Jul 2014 10:12:26 PDT
ARDUINO not powering up!? Ankan Nayak I have made an arduino uno robot, i have run 2 motors via the l293d ic which i've powered with a 9v battery regulated to 5v. The whole thing worked very well when run with the usb but when I plugged a 9v battery to the arduino, it did'nt work. Please suggest a sol. fast, its urgent again!!!
By: Ankan Nayak

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Sat, 26 Jul 2014 07:07:26 PDT
I fried the arduino mega? chrissunny94 Ok i was using an arduino mega and ramps 1.4 motor controller for my home build cnc.During the time of testing ,there was ahuge back current and probably the mega is fried. This is the state now,when i plug the mega on to my computer : 1)The Green ON led lights up 2)device detected ,but not recogn...
By: chrissunny94

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Tue, 22 Jul 2014 23:15:11 PDT
URGENT!!!sketch for arduino robot with ping? Ankan Nayak i am making an arduino obstacle avoiding robot for my science project.. But i am not getting a suitable sketch for a ping to use with it. I am only getting that of sharp ir sensor. Please help me out with a sketch..its urgent..below i have linked the site where there is the sketch and the project da...
By: Ankan Nayak

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Mon, 21 Jul 2014 12:57:14 PDT
Arduino or Raspberry Pi? Seanex Well I am a 16 year old High School student interested in engineering and things of that sort. I recently took an engineering class at my school and was thoroughly pleased with the concepts. My father is also an engineer, and would like me to dive deeper into these sorts of things. Being a long time...
By: Seanex

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Tue, 15 Jul 2014 18:07:55 PDT
Why can't I send a Private Message with a free account? It explicitly stated that that was possible with a free account ard99
By: ard99

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Sun, 13 Jul 2014 23:18:30 PDT
problem with arduino? sgupta95 I have some questions about Arduino Uno. I connect my board and within 5 minutes (no code is running or anything), the chip becomes hot. Plus, none of the IDE is recognizing my board. I'm always getting the error "avrdude: stk500_getsync(): not in sync: resp=0x00". Can someone help me with these iss...
By: sgupta95

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Sun, 13 Jul 2014 14:05:53 PDT
my arduino's L led is not blinking so i figured out i cannot upload a program.? robobot3112 i need to submit it as a project this month.can anybody give me the cause or a trouble shooting advice?
By: robobot3112

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Sun, 13 Jul 2014 06:42:45 PDT
How to move plate in front of window with arduino? piefert I would like to be able to move a plate in front of a window in a door to prevent light from coming in at night. I don't know how to attach the plate onto the door in such a way that it can be moved with the use of a servo/motor controlled by the arduino. I would also like to know where how I could ...
By: piefert

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Sat, 12 Jul 2014 08:27:51 PDT
Unable to program an Arduino micro. Any ideas on how to fix this? DoctorWoo I've been working on a project for some time now, and I plan to embed an arduino micro into it. As such, I just went to do a dry run of the setup with the micro before I started putting it all together. And failed miserably.  Few things to get out of the way: -It is an off-brand, but it does have t...
By: DoctorWoo

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Thu, 10 Jul 2014 02:52:27 PDT