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Using the Same Input to Trigger Multiple Arduinos

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.



 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
Using the Same Input to Trigger Multiple Arduinos
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


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