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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2answers
17 views

Does 1Vac matters to a Arduino pin?

I am planning to do a current measurement with Arduino. The board I'm using is mega 2650, operating voltage is 5V (I/O pin limit is 3.3V). And the CT I'm using is exactly the same as this tutorial, ...
0
votes
1answer
33 views

Super Slow Serial (UART) Communication Arduino

So hopefully this question isn't an issue for stackexchange but I am using this device for my arduino that connects to the OBD-II port of my car to get various information such as speed. rpm, etc. ...
5
votes
1answer
75 views

ATtiny84 resets on high load

I'm using a ATtiny84 and with three 74HCT595 serial to parallel converters to drive 24 LEDs. Every thing works fine, but when I try to light up more than 10 LEDs at the same time, the ATtiny84 program ...
0
votes
1answer
36 views

Calcultions to choose between a transistor (switch)

thanks in advance :). I am a little bit confused, i need to turn on a led lamp (5watts), using a light sensor from my Arduino. I was reading a lot of theory the past two days. Here is the deal: ...
1
vote
4answers
243 views

Combination of four half-bridge load cells

I have a kitchen weight scale containing four half-bridge load cells, each cell associated to one foot of the scale. I want to hack it to use it as a pressure sensor and link it to an Arduino ...
3
votes
3answers
1k views

arduino thermal anemometer

I've been trying to use my arduino as a thermal anemometer based on the excellent and tiny IST FS5 "thermal mass flow sensor" - there is more information and a datasheet here - ...
2
votes
0answers
40 views

How can I control brightness of a CFL with a microcontroller?

I'm new to electronics and just turned on and off appliances with an Arduino and relays. Now I also want to control the brightness of a CFL with an Arduino as I controlled the brightness of a LED. So ...
0
votes
1answer
13 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 ...
2
votes
2answers
130 views

Attiny44A Arduino Multitasking

I am trying to blink a led as well as switch a motor on/off parallely using attiny44A below is my code: Pump Controller: ...
0
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0answers
44 views

Decode an infrared signal with an IR demodulator inside a microphone jack

I was looking at this tutorial about how to decode an infrared signal. One of the posts says For the scoped challenged (like me), a PC microphone jack works great for reverse engineering IR ...
0
votes
1answer
31 views

Bluetooth Headset to Bluetooth Transceiver

I have a little bit of experience with Bluetooth and Arduinos but I was wondering if anyone might be able to tell me if it is possible for a Bluetooth headset to be linked to a Bluetooth transceiver ...
1
vote
3answers
98 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. ...
0
votes
1answer
82 views

Serial monitor controls Arduino Motor Shield; why Bluetooth didn't do?

I have got Arduino Mega 2560, Ladyada Motor Shield v1.0, HC-07 Bluetooth Module, and Android Bluetooth Terminal App. I combined Motor Shield on Arduino Mega. I get M+(5V)/GND point to run my HC-07 ...
0
votes
1answer
53 views

Make sure this equipment can do what I want (infrared decoding) [on hold]

I'm CS but took a digital electronics physics class at my old university and found it really interesting so I wouldn't mind having my own small EE workshop. For my main project I just want to decode ...
2
votes
1answer
365 views

Communications issues between Ardupilot and Computer

The Issue and Project: I have been at a standstill with my autopilot because I cannot communicate with it using my high powered transmitter: the Ubiquity Rocket M5. But the whole communications issue ...
0
votes
1answer
56 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
votes
2answers
813 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 ...
3
votes
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
35 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
votes
3answers
117 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
votes
1answer
40 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
946 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
votes
0answers
59 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
votes
0answers
35 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
votes
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
357 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
vote
2answers
336 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
108 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
votes
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
vote
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
53 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
votes
2answers
39 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
votes
0answers
20 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
553 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
votes
0answers
25 views

Edit option configure on arduino [closed]

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
vote
1answer
35 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
votes
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
vote
1answer
45 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 ...
1
vote
2answers
232 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
votes
1answer
55 views
0
votes
2answers
63 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
275 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
72 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
428 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
228 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
288 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
votes
0answers
59 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 ...