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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16 views

SIM900 use same tcp connection to receive and send data

I'm trying to make my gboard (Arduino with attached SIM900) talk with my server over GPRS and a TCP connection. Firing up the board, attaching GPRS to it and make a tcp connection all works fine. ...
0
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2answers
60 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, ...
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1answer
64 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. ...
0
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1answer
51 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: ...
2
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0answers
42 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 ...
5
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1answer
85 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
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1answer
16 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
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3answers
150 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
45 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
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1answer
54 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 ...
0
votes
1answer
32 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 ...
0
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1answer
57 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 – ...
1
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1answer
36 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 ...
1
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3answers
99 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
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1answer
41 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
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0answers
61 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
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
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0answers
45 views

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

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 ...
0
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2answers
40 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 ...
2
votes
2answers
56 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
0answers
21 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 ...
0
votes
0answers
26 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 ...
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 ...
1
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1answer
47 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
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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 ...
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?
0
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1answer
55 views

Save variable between loops in Arduino IDE

I have this code: ...
0
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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 ...
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
votes
2answers
64 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 ...
0
votes
0answers
13 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 ...
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 ...
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
41 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
votes
2answers
31 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 ...
0
votes
2answers
55 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
27 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 ...
2
votes
2answers
80 views

Overcoming voltage drop in a battery

I want to use this battery for my Arduino Uno: ...
0
votes
1answer
47 views

AVR ISP-Programing LEDs SCK

I'm using a Attiny45 microcontroller and USBtinyISP as my programer, and this is the first time I need to hook stuff up (in this case just LEDs, but eventually I'll want to conect a raspberry pi) to ...
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votes
0answers
48 views

Arduino SPI TFT module not working - Module TM022HDH26

I have bought SPI TFT module from ebay (Model # : tm022hdh26), and I wired up the module with my Arduino UNO, After uploading Arduino TFT examples, only i can see is blank white screen. Also i must ...
0
votes
2answers
87 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
68 views

how to cut off power from usb device using arduino

Seems like I can't restart USB modem in Linux, so I setup an arduino gig to emulate usb modem plug/unplug. I have Arduino Uno R3 and several N-channel mosfet https://www.sparkfun.com/products/10213, ...
1
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2answers
54 views

3.3V digital signal as input to Arduino mega 2560

I am using arduino mega 2560. I know it reads digital input signal of 5V as high but could any one tell me whether it takes 3.3V digital input as high or not? And what is the minimum value it ...
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 ...
1
vote
1answer
97 views

Why would a pin not go high on an Arduino?

I'm using a SparkFun-built Arduino Pro Mini 3.3V / 8MHz. One thing I need it to do is toggle the gate pin on a MOSFET, and that's not working for some reason. Getting in there with a multimeter, I see ...
1
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0answers
34 views

Atmega328 NFC cannot wake

I'm trying to communicate my 328 with DFRobot's NFC Module a while now, but I cannot wake the card. Below is my code, where I use DF's instructions on how to make the card work. I write what card ...
1
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1answer
142 views

Getting 9V and 400-500mA out of a 24V power supply

I recently bought this power supply to power a microstepping stepper motor controller (which requires an input voltage of 24V). My project requires the ability to dynamically turn on and off an ...
2
votes
1answer
66 views

Problem using DS1337 - RTC

I am trying to use a edited version of the library given at this link. I basically changed some of the included file and some of the changed function of the wire.h library. Though I am not a hardcore ...
0
votes
1answer
75 views

Is my moisture sensor (YL-69) broken?

I recently bought a moisture sensor off eBay (one of those Chinese YL-69 like can be seen here) and my original plan was to use it with an Arduino board. However, after much experimenting I realize ...