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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29 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
30 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 ...
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2answers
56 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. ...
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1answer
34 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, ...
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0answers
55 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 ...
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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: ...
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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 ...
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 ...
2
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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 ...
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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 ...
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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 ...
0
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2answers
98 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
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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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 ...
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
54 views

Save variable between loops in Arduino IDE

I have this code: ...
0
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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 ...
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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 ...
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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 ...
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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 ...
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0answers
55 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 ...
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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 ...
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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
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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 ...
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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 ...
2
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2answers
80 views

Overcoming voltage drop in a battery

I want to use this battery for my Arduino Uno: ...
0
votes
1answer
43 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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0answers
43 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
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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
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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, ...
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2answers
50 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
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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 ...
1
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1answer
94 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 ...
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0answers
31 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
141 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
60 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
71 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 ...
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0answers
63 views

Half a meter long camera cable

I'm currently in a project using an image sensor but I'm a bit stuck at this moment. My current design consist of an image sensor OV2640 connected directly to a SIM5218 which stores and sends ...
0
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0answers
59 views

Read Gyroscope (& Accelerometer)

So I have an MPU-6050 (Triple Axis Accelerometer & Gyro Breakout), which I use with an Arduino UNO. Everything is connected properly and I can easily read the raw data from the MPU-6050 on the ...
1
vote
1answer
57 views

RF transmitter connected directly to sensor

I am trying to implement the following : I got 2 (more than 1 anyway) distinct sensors and an arduino and I need to get the sensors' state wirelessly. Here is what I have thought of so far: As for ...
0
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2answers
65 views

Arduino overheating with 5V addressable LED strip

I've got one of those 1-meter addressable RGB LED strips from Sparkfun (link) connected to an Arduino. The Arduino is powered by the recommended 9V DC 650mA power supply through the barrel jack. ...
0
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1answer
52 views

Arduino SSR 5V DC (Mager GJ-3FA-L)

I just noticed this SSR that was for DCV instead of all the others that are normally for AC. Although I can not find the datasheet for it, it does seem compatible with Arduino. eBay auction site ...
0
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1answer
58 views

How to power servos externally in Arduino

I tried to control 2 servos with my arduino. It worked fine but if I try to control 5 servos with my Arduino, it doesn't work. I want to power up the servos externally but I don't know how to do it. ...
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1answer
105 views

Designing/looking for a circuit board for a vaporizer

I recently decided to look for/create a board for a vaporizer and have no idea where to start. I will probably end up programming the program in C or C++. To better explain this, I will explain the ...
0
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1answer
93 views

Power LED's using RF transmitter and receiver with Arduino

I'm working on a project that I have two sensors, two Arduinos (a YUN and an UNO), two LED's, and an RF transmitter/receiver It's a pretty simple procedure: Activate a force sensor, send it via RF ...
0
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1answer
88 views

L298N damaged? What to do?

I'm trying to control a DC motor with the L298N motor driver and it worked for a brief moment. I've used the setup mentioned in this video tutorial, but someone in the comments said that with this ...
0
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2answers
66 views

Delay function in Arduino microcontroller

Arduino IDE has a "Blink without Delay" example code. In here it comments: "Turns on and off a light emitting diode(LED) connected to a digital pin, without using the delay() function. This means ...