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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1answer
37 views

7-segment driving circuit not working as expected

I have designed and built the following 7-segment driving circuit utilising an Arduino Micro in order to try and further understand electronic circuit design: simulate this circuit – ...
2
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2answers
806 views

8x8x8 Led Cube Driver Circuit

I am going to build 8x8x8 LED cube. Before I do I need to figure out a good driver circuit. I came here because I have very little knowledge about how a lot electronic parts fit together. So here's ...
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2answers
60 views

NPN BJT Relay Circuit will not turn off

I'm applying a 3.3V signal with my Raspberry Pi to the base of an NPN transistor to activate a SPDT 6V relay (relay data sheet, model G2R-1-S-DC6(S)). The relay pickup/dropoff voltage is 4.4/0.9V. ...
3
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2answers
5k views

Receiving SMS using GSM and controlling LED using Arduino

Has someone come up with a solution with the above stated problem? We are using Arduino Duemilanove and SIM 900 GSM module ...
1
vote
1answer
31 views

Creating and Receiving Electromagnetic Field with RaspberryPi

I am trying to make a basic HLEM (Horizontal Loop Electromagnetic) device for my undergraduate thesis but I haven't started yet, just researching that can I build it myself without sufficient help. I ...
0
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3answers
114 views

Regulated +5V drops when relays are switched on

A regulated power supply RAC02-055C/277 provides 5V to an Arduino driving 2 relays. The power supply is rated to provide 2W of power. Connecting a multimeter between one of the leads of the power ...
0
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1answer
35 views

Arduino Serial connection

I've written a small program for Arduino, in which it receives a two digit number from serial, for example ""26". Then it set's HIGH voltage to pin 2 with the duration of 6*100. That works fine, ...
0
votes
1answer
925 views

Controlling a 4-wired fan PWM Signal using Arduino allows only two settings

I have connected my pwm pin to my arduino like in this tutorial http://fritzing.org/projects/reading-pc-fan-rpm-with-an-arduino/ It's working properly. I can read and set the speed using a sketch ...
0
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0answers
56 views

8x40 led matrix [on hold]

I am building an 8x40 led matrix for a project and have run into some trouble coding. I have been using an arduino and I cant seem to get the code to run properly. I have been to several other sites ...
0
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0answers
30 views

SMS-based LED control using Arduino and SIM900 [on hold]

I need to control LED's using Arduino. But when I use the example code given in IDE, the following error occurs: ...
-1
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0answers
44 views

Turning a DC motor a set number of Rotations using an encoder [on hold]

I'm using an arduino UNO, and i want to turn a motor a set number of revolutions, i'm trying to read the clicks of the encoder which has a resolution of 360 clicks/ revolution, my logic is that i ...
1
vote
1answer
355 views

How to Control SM1 Inverter Drive Frequency with Arduino?

I am back at trying to control the frequency of an SM1 AC inverter drive due to the fact that I never got it going the first time. However, this time I would like to use an Arduino. The manual for the ...
1
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2answers
332 views

Single and Double Click on Arduino Multiplexed Buttons

On my arduino project i have 8 buttons connected to a 4051 Multiplexer. I would however like to add single and double click funcionalities to each of these buttons, but i can't find a way to do it. ...
0
votes
2answers
99 views

Programming an ATMega328 with Arduino bootloader via a FTDI USB-serial adapter

I would like your advice relating to using the Arduino IDE and avrdude to program an ATmega328 which is preloaded with an Arduino bootloader. I am using a USB to TTL-serial breakout board based on an ...
5
votes
4answers
4k views

I don't understand what are the difference between UNO and Leonardo?

I found that they sell UNO Starter kits and Leonardo Starter kits. There are many different products. My eyes are so busy. I am a greenhand. If I want to buy a stater kit, which one should I buy? UNO ...
0
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2answers
124 views

gizDuino(arduino clone) doesn't power up with 7.4v battery

So i am using an arduino clone gizDuino. Im connecting it to a lcd module. I successfully connected all the pins in the diagram, but when I connect it to the microcontroller the backlight doesnt power ...
1
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2answers
45 views

Canon DSLR - Read camera “busy” state

I'm going to control my Canon DSLR with an Arduino board. How can I get current camera "busy" state before firing then next shot so I will keep waiting until it will finish all its jobs?
2
votes
2answers
47 views

How to power a Arduino Yun with a 6V battery?

I would like to power my Arduino Yun board with the following battery: Arduino Yun has a VIN pin that represents the input voltage to the Arduino board. The official documentation says: Unlike ...
0
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2answers
38 views

Button cells for arduino uno

OK, before I start I know that there is significant difference and that the Arduino Uno is not designed to run off button cell batteries especially to run both the ...
0
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0answers
18 views

MODBUS WRITE COIL opearation

I am trying to perform write coil operation.In below code i can read data But i could not able to performs write operation. SInce my code size is big i am pasting part of code. Give me simple example ...
5
votes
2answers
550 views

MOSFET LED Driver for low power LED's

Now that the music festivals are getting closer this summer, I thought I would build some low-power dancefloor lights for my camp. The circuit I've found is really simple, but unfortunately I am not ...
0
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0answers
25 views

Edit option configure on arduino [on hold]

I have similar set up as shown in image. But all device connected to switch 5 port. From Model one LAN connection goto switch port 0 from PC one LAN cable connection goto switch port 1 from Ethernet ...
1
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1answer
33 views

MilesTag IR communication protocol

I'm making my own laser tag and I was checking out existing open source solutions. The MilesTag protocol uses 600us as the basic pulse length. This however limits the maximum rounds per minute to ...
2
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2answers
1k views

Arduino + Max7221 + Common anode 4-digit 7-seg LED array?

I'm trying to hookup a common anode 4-digit 7-segment LED array to my Arduino via a Max7221 IC. Here's a hard-to-see (sorry!) pinout for my LED array (my LED array is the bottom common anode one, ...
1
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1answer
40 views

Display digits on 7 segment 3 digit LED display with Launchpad

I have a 7 segment led display with 3 digits (BT-M512RD-DR1 ) and Valueline Launchpad MSP-EXP430G2 I connected LED display according to this answer and here is my version of the sketch But I am ...
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2answers
230 views

DMX (serial first) over Xbee Pro Module with Arduino

I want to transmit a DMX signal over a Xbee RF module. I came to realize that sending 1 Universe of DMX can be problematic. Looking at the Open DMX page we see that the computer's DMX information is ...
0
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1answer
55 views
0
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2answers
55 views

Arduino UNO R3. IDE Error-Not in sync. TX shorted to 5v?

I have (had?) an Arduino UNO Rev 3. While uploading sketches Arduino IDE reports this error avrdude: stk500_getsync(): not in sync: resp=0x00 I'm not sure when or why it stopped working. It would ...
1
vote
1answer
274 views

Arduino Coin Operated Appliances

As my server collection is rapidly growing so is its power consumption. I'm looking for a way to pay for the power before hand. I had something like this in mind. Although I'd use a coin acceptor such ...
0
votes
1answer
68 views

Ultrasonic Sensor Controller

I am working on a project at school where we need sonar input to control a little vehicle. Pretty simple stuff, usually. However, we're having a bear of a time getting the sonar to work. My faculty ...
3
votes
1answer
419 views

Logging measurements from an analog Gas Meter

I want to capture a gasmeter counter to log the gas consumption in my database. Problem: till now I did not find a way to read the meter. I tried a sensitive hall sensor that could react on the ...
1
vote
1answer
217 views

Hacking a four load sensor based personal weighing scale

I am trying to hack a personal weighing scale.I had taken help of this tutorial but the language used in this is not very easy to understand due to the non-standard naming used for load sensor wires, ...
2
votes
1answer
74 views

Read variables from Arduino code into PureData?

I've been trying to find ways to pass a variable from my Arduino code into PureData in real-time. I've explored PDuino and the Firmata library, but the tools seemed a bit more for reading and ...
2
votes
4answers
286 views

Calculating Wavelength of sound using an Arduino

I'm using an Arduino Uno R3. I need to measure the wavelength of sound of a particular (known) frequency. By substituting in the equation: Vsound = Frequency * Wavelength ...I wish to calculate the ...
0
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0answers
56 views

Help with ICs, 2-digit 7-segment displays, 74HC4515

Can someone show me how to connect two DC56-11YWA 2-digit 7-segment LED displays to an Arduino Uno or Mega2560 using two 74HC4515s? Is there another IC that I will need in addition? I want to display ...
0
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0answers
17 views

Connection problem with Arduino Mega 2560 and GSM shield ( official M10) [migrated]

As I don't want to stack the shield over the mega 2560 board, I try to connect only the pins that used for GSM communication. Here are my connection: Pin 3 on Mega <==> Pin GSM Rx on Shield Pin ...
0
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1answer
73 views

Arduino Uno Doesn't show up under Serial Ports, but it does show up in Device Manager

My Arduino Uno doesn't show up under Serial Ports in the Arduino IDE, but it does show up in Device Manager. I have a I2C Sainsmart LCD connected to the Arduino. Do you have any idea why it would do ...
0
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2answers
4k 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
vote
1answer
415 views

Unable to upload arduino sketch to Uno using AVR ISP MKII and Ubuntu 12.04

About a week ago, I tried to use my Arduino Uno to program a a standalone atmega328p with optiboot. Not only was I unsuccessful, but now I can't upload sketches to the original atmega chip. The "L" ...
0
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0answers
11 views

VirtualWire and ServoTimer2 on an Arduino Mega

I faced some problem in using VirtualWire and ServoTimer2 on a same Arduino Board. The RF module on the board work well, but the servo did not execute its operation as stated. Anyone had solution on ...
2
votes
1answer
2k views

Problems using Servo.h and VirtualWire.h in arduino

I'm using an Arduino Uno. My motive is to control a servo via wireless transmission using RF. So for that I have to use both Virtual Wire.h and Servo.h. But when I am compiling it shows me errors that ...
0
votes
2answers
81 views

Stepper motor causing Arduino brownout?

I'm trying to build what amounts to a single-axis CNC machine running off a 12v automotive type electrical system. Here's a basic description of the build: Arduino Uno Just for testing, I'm using a ...
0
votes
1answer
39 views

Why does my PWM Arduino loop not working as intended?

I have a Arduino sketch I am trying to use to control a DC motor using PWM. It seems it it just running the motor as if I the PWM was set to 255 (100%). I intend for my sketch to start the motor ...
0
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0answers
38 views

Designing a pluggable current/information circuit

I'm trying to solve a technical problem for a project I'm working on, and being from a computer programming background I'm having trouble getting the electrical engineering part off the ground. Please ...
0
votes
0answers
37 views

3 wire load sensor connection to INA125P

I am trying to use a 3 wire load sensor, connect it to INA125 for voltage amplification and then use the amplified output to be fed to ADC of Arduino. I had used below configuration with INA125. ...
0
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2answers
29 views

Infrared Signals w/ Arduino

I am working on a project that uses infrared LEDs to send signals at certain intervals. The arduino I was planning to use would've been sending data @ 9600 mbps, and sent a signal, such as "hi" every ...
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0answers
27 views

Decagon 5TM integration with my own data logger [closed]

we are creating an Arduino Mega based PCB for data acquisition. For soil moisture and temperature, we plan to use Decagon 5TM. I have looked at the data sheet and I just want to confirm that ...
0
votes
2answers
54 views

Arduino and several leds

Can an Arduino turn on multiple leds at the same time?. I want make a home made lamp with several less controlled with an Arduino UNO light sensor and i already have the light sensor, also i know how ...
0
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0answers
24 views

2.4" TFT LCD Shield isn't working on Arduino Mega

Even on ebay's website it is mentioned that I can't use 2.4" TFT LCD Shield display on attach to Arduino Mega. The problem is that I bought this shield by mistake. I want to put this shield onto ...