Preview Mode Links will not work in preview mode

Learn Programming and Electronics with Arduino

Apr 18, 2017

If you ever have a project using two or more Arduinos, it's likely you'll want them to work together.

Say for example you have one Arduino connected to an LCD shield, and another Arduino controlling an LED matrix.  You want both to do something when you press a single button - how can this be done?

It turns out to be extremely easy.  This video will describe in detail how to trigger multiple Arduinos with a single input.


 /*   Button   Turns on and off a light emitting diode(LED) connected to digital  pin 13, when pressing a pushbutton attached to pin 2.    The circuit:  * LED attached from pin 13 to ground  * pushbutton attached to GND through pin 2 on two (or more) Arduino's   * Note: on most Arduinos there is already an LED on the board  attached to pin 13.    created 2005  by DojoDave <>  modified 30 Aug 2011  by Tom Igoe  Modified 16 APR 2015  by Michael James   This example code is in the public domain.  */  // constants won't change. They're used here to // set pin numbers: const int buttonPin = 2;     // the number of the pushbutton pin const int ledPin =  13;      // the number of the LED pin  // variables will change: int buttonState = 0;         // variable for reading the pushbutton status  void setup() {   // initialize the LED pin as an output:   pinMode(ledPin, OUTPUT);   // initialize the pushbutton pin as an input:   pinMode(buttonPin, INPUT_PULLUP); }  void loop() {   // read the state of the pushbutton value:   buttonState = digitalRead(buttonPin);    // check if the pushbutton is pressed.   // if it is, the buttonState is HIGH:   if (buttonState == LOW) {     // turn LED on:     digitalWrite(ledPin, HIGH);   }   else {     // turn LED off:     digitalWrite(ledPin, LOW);   } } 


Breadboard Layout:

Using one button to create two inputs with Arduino



Schematic Fritzing File.fzz


If you like this tutorial, check out some of out very best by signing up for our free Arduino Crash Course below.