Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. It's intended for artists, designers, hobbyists, and anyone interested in creating interactive objects or environments.

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25 views

Cascading PID DC Motor Position & Velocity Controllers

I'm trying to build a robot with a differential drive powered by two DC motors. First I implemented a PID Controller to control the velocity of each motor independently. Estimated the TF using the ...
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1answer
36 views

How to choose what a power supply to drive 2 x 10watt RGB LEDS?

I'm trying to figure out how to determine what power supply I should be using for different types of LEDs for this and future projects. I have 2 x RGB LEDS: Forward Current: 350mA Forward Voltage: ...
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0answers
25 views

Triple Axis Accelerometer Breakout - ADXL335 synchronise

I have three ADXL335 Triple Axis Accelerometer Breakout boards. I wish to measure the the acceleration of a human leg as it walks at three points (hip knee and ankle). I want this to log this data in ...
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1answer
45 views

Controlling various Arduinos with Android

I have an upcoming project which requires me to use about 8 different Arduinos, probably more. They all perform a light show which turns off and on various LEDs at different timings to simulate a ...
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3answers
1k views

Have I fried my Arduino UNO?

So I've recently been playing with my first Arduino, until it, for some weird reason, stopped working. What I did: I had it attached to a breadboard. When I say attached, I mean it was supplying ...
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1answer
58 views

Reading switches without a common ground from Arduino

I'm trying to interface a steering wheel control interface with an Arduino. The interface connector has 6 pins, A to F. These ...
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5answers
3k views

Arduino-controlled slot car set - Why are my MOSFETs burning out?

I'm attempting to control the speed of a slot car using an Arduino and a MOSFET. I'm new to MOSFETs, however, and while my setup works for a moment, eventually the MOSFETs (N-Channel) open up, and ...
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2answers
615 views

TLC5940 and ADXL335 circuit 'glitches' on perfboard. Need decoupling caps?

I created a circuit containing one TLC5940 and one ADXL335 breakout board. The ADXL board comes configured with 0.1 uF capacitors to set the bandwidth of each axis to 50Hz. It is wired to an Arduino ...
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2answers
510 views

How to kill an Arduino when (dis)connecting 12V to Vin?

I have (had?) an Arduino Nano. I had it connected to the USB port and was working a charm. I also had it connected a 12V battery pack to VIN and GND. I had done this several times without any ...
7
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1answer
2k views

Multiple 74HC595 chained together won't light all LEDs

I'm new to Arduino - and electronics in general - and am having a frustrating problem with two serial-to-parallel 74HC595 chips trying to drive two 7-segment LED displays. The LEDs are both common ...
4
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3answers
428 views

Extending LED length

Completely new to electronics, I've just begun to play with an Arduino. I was wondering, if I wanted to make an LED sculpture, what is the correct way to extend the legs of each LED so that they stand ...
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0answers
48 views

interfacing sata with arduino [on hold]

First off, I already know arduino is too slow to interface with SATA, but thats the point of this project. I am trying to make a SATA sheild for the arduino uno. All I need is documentation on the ...
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1answer
97 views

Arduino pin frequency for persistence of vision (POV) project

Arduino Uno has 4 pins that run at 960 Hz and 2 pins that run at 490 Hz. Are those frequencies fast enough that I can change the strips that lights up the LED and create the illusion that it lights ...
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0answers
30 views

How do I trigger a 1 wire capacitive touch button?

I have a lighting controller in my house for my under cabinet lights. It has a capacitive touch remote button with a 1 wire interface to the controller. How can I trigger this 1 wire remote with an ...
3
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2answers
58 views

Sharing Clock and Data for 74HC595 and CD4021B Shift Registers?

Can output shift registers (74HC595) and input shift registers (CD4021B) share the same clock and data lines on Arduino using SPI, with different latch pins "activating" either chain for input or ...
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4answers
126 views

Voltage decreases on higher current

I have a circuit composed of Arduino Mini Pro 3.3V and GY-GPS6MV2 (GPS Ublox NEO-6M). I have tried to power it with 3 different sources: 3xAA NiMH in serie connected to RAW pin of Arduino and using ...
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0answers
34 views

Error in PWM duty cycle readings [on hold]

I am working on a cruise control system. The duty cycle display 100% when the throttle controller produced both positive and negative result. I am okay with Duty cycle of 100% when throttle is ...
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1answer
496 views

No luck trying to make two XBees communicate in API mode with arduino XBee library.

I have been trying to make two XBees communicate for a long time. I have checked everything and at last I come here for some help from the experts or who have already stumbled upon the same problem as ...
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4answers
6k views

Arduino Uno SoftwareSerial and Serial conflict

I have a very simple setup with an Arduino Uno R3 connected to my Windows 7 x64 with Arduino 1.0.1. I have a RF receiver connected to the Arduino on the DI10 port using the SoftwareSerial library. I ...
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0answers
32 views

9 DoF Sensor Accelerometer Readings Inconsistent

I have the following sensor stick: https://www.sparkfun.com/products/10724 It has an accelerometer, gyroscope, and magnetometer. I have connected it to an arduino and am reading the accelerometer ...
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3answers
72 views

How can I emulate two analog joysticks (potentiometers) with an Arduino?

I have a quadcopter (Syma X5C) that I really want to control with an Arduino. Since I have the ability to write programs to my Arduino to make the quadcopter fly autonomously, I want to modify my ...
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0answers
44 views

L293D causing motors to move slowly

I'm modifying an RC car to use bluetooth. I use the L293D chip, and when I connect the motor to the chip, the car barely moves. If I connect the 9V battery directly to the motor, it moves the car ...
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1answer
41 views

How can I program Mega2560 with Atmel Studio 6.2

I have got the SainSmart Mega2560. The problem is now: how can I program it with Atmel Studio 6.2? I can find no way to upload code, because the controller is not in listed and with ISP I can not do ...
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3answers
59 views

SPDT Relay with 8Pin

I needed a SPDT relay with 240Vac so I bought this relay from Maplin http://www.maplin.co.uk/p/15a240vac-spdt-miniature-relay-n07aw But I am heaving problem to wire this relay because it has 8 pins ...
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1answer
6k views

Wiring a GY-521 to an Arduino Uno R3?

I am searching for a non-technical picture or diagram or explicit textual instructions explaining how to wire a GY-521 Accelerometer/Gyro to an Arduino Uno R3. I am a software developer and need ...
1
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1answer
769 views

How to connect an Arduino to a STM32F4 evaluation board?

I have a few Arduino and sensors on Arduino shields. I also have a STM32F4 Discovery evaluation board. For a hobby project, I have a feature on an Arduino (Ethernet port on my EtherMega) that I would ...
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1answer
57 views

MIDI To Polyphonic Square Wave on Arduino

I've been struggling with this for a few days now, and I would really like to get on with my project. Unfortunately this is holding me up. What I am trying to do is retrieve MIDI signals sent over USB ...
0
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3answers
60 views

Can I power Ardiuno using buck converter IC 3485 or any other buck circuit?

A buck circuit lowers the voltage by generating pulses at a certain duty cycle. Is it okay to give this pulsing voltage to Arduino? Can Arduino work normally with this? I have 12V battery and I want ...
3
votes
1answer
1k views

How to keep the arduino uno up on serial connections?

Each time I open a Serial connection to my arduino it restarts. Is there a way to unactivate this ? Cheers.
-1
votes
1answer
46 views

How to Control a 3D Printer Extruder [on hold]

I am trying to control a 3D Printer Extruder that I got online. I know that for the most part, a person would just plug this in to a circuit board and it would just work. I want to make my own circuit ...
0
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0answers
22 views

RFID smart bookshelf and Arduino [closed]

We're trying to make smart bookshelf in our office for books tracking. Basically the requirements are: 1) Each person in office must attach RFID card to the RFID reader and only then take the ...
2
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3answers
537 views

Can the atmega168 bootloader be installed with arduino uno?

I have an arduino unu (pre-made) with the atmega328 and an atmega168. I am wanting to make a second arduino out of the 168. I don't have a USB programmer. The chip came out of some servo contorller ...
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0answers
69 views

SEPIC hardware problem [closed]

I am doing my project on SEPIC converter. It seems that the switching action between drain to source is happening only at low voltage. At high voltage it does not work. What seems to be the problem? ...
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0answers
22 views

Sepic hardware 2 [duplicate]

Hi i am attaching more images, i hope you would understand img. 1 is the waveform at 8 V input is applied to the Sepic converter. img 2-4 are various low voltage (below 2V) applied
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1answer
109 views

How can I power this LED Matrix?

I'm controlling a 16x32 LED matrix with an Arduino and have it wired correctly (I think) but I'm having trouble with the power. I tried to follow the instructions from Adafruit but was unsuccessful in ...
0
votes
1answer
49 views

Sharing the Seeeduino LiPo with a motor controller

I'd like to use a Seeeduino to control a small DC motor to wind/unwind a thin cable which will be lifting a small door. Ideally, I'd like to use the same LiPo that's being used to power the ...
0
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1answer
81 views

Low-cost Up-Down Servo solution

I have a small project and I'm interested "upgrading" to a more produce-efficient design. Please note I'm no electrical engineer. I want to move a small servo (like this one ...
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0answers
60 views

One-shot sound button/trigger for Arduino Sound Player

I've succeeded in making a simple Arduino ATMega328 sound player on my breadboard following this guide. . . http://highlowtech.org/?p=1963 http://playground.arduino.cc/Code/PCMAudio But, here's my ...
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0answers
7 views

I bought USB > FT232RL, can I use it to program a bootloader onto an Arduino? [migrated]

I bought this thing off of eBay: eBay Link Will it allow me to program an ATmega[xxx] (Arduino clone) with a bootloader? --> If so, how would I go about it? What should I do, and what should I ...
4
votes
1answer
75 views

AVR ATMega I/O pin overcurrent protection

I want protect I/O pin against overcurrent to make circuit more robust. Atmel's AVR040: EMC Design Considerations discusses internal overvoltage protection in General I/O Pin Protection paragraph. But ...
2
votes
1answer
1k views

Arduino, RGB LED, BlinkM MaxM controller

I'm a student from QUT doing interaction design this semester (you've probably heard from a few of us over the past few months). Anyway I just order the 25 diffused RGB Leds if that rings a bell for ...
0
votes
1answer
120 views

Current draw at digital output pin differences in two equally coded segments -probable cause?

I measured the current output of an Arduino Duemilanove (with an ATmega168) in two cases and found out that the currents differ strongly. The following code creates an output of 72mA at pin 13 ...
3
votes
3answers
7k views

Arduino - Stop execution of code definitly

I've got a big problem with my new Arduino. I made a big mistake, and now I can't anymore connect to my arduino. Is there any possibility to recover the Arduino, or to stop the execution of code ...
1
vote
2answers
73 views

How to power my datalogger?

I am building GPS datalogger. It will consist of Arduino Pro Mini 3.3V, GPS module - GY-GPS6MV2 (GPS Ublox NEO-6M) (bypassing 3.3V regulator) or Skylab SKM53 (MT3329). Data will be written to SPI ...
0
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0answers
35 views

dB Meter with Arduino and AD8307

I am attempting to construct a decibel meter using an electret mic breakout board (shown below) and an AD8307. If necessary I can use just an electret mic, and not the breakout board. I was ...
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2answers
115 views

130V DC Motor Control

I am interested in building a control circuit for a motor. More specifically this motor. The model I want to control is the 130V model, 0.48A, which should make it at ~62W for the motor, and 1/17 ...
0
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1answer
92 views

how to provide a steady voltage, in case of source voltage drop due to heavy consumers in the circuit

I am designing an arduino circuit in which the power source is a battery connected to some heavy current consumers, these consumers are intended to work for short time and infrequently, my question is ...
2
votes
2answers
295 views

I/O series resistor

I've read that digital I/O pins should have a resistor in series in order to limit noise. Should one also use such approach when interfacing with the I/O pins of an arduino, or is that already done on ...
14
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2answers
4k views

Can Arduino be used in commercial products?

Is it legal for me to sell a product that's built with an Arduino? I know that it's open source, but does that mean I can sell my product for profit, or only for use in prototyping?
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1answer
72 views

Arduino Bluetooth BLE boards function as iBeacon emitters, or receivers?

I have just purchased the estimate iBeacon developer kit and am doing research on iBeacons, building demo apps using Adobe AIR with native extensions. I was curious if any of the many Bluetooth BLE ...