Project Button Module

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<syntaxhighlight lang="c"> /*

Turns on and off a T010111 LED Module connected to O0 (digital  
pin 11), when pressing a T000180 pushbutton attached to I0 (analog pin 0). 
created 2005
by DojoDave <>
modified 17 Jun 2009
by Tom Igoe
modified 7 dec 2010
by Davide Gomba
This example code is in the public domain.
based on
#define O0 11
#define O1 10
#define O2 9
#define O3 6
#define O4 5
#define O5 3
#define I0 A0
#define I1 A1
#define I2 A2
#define I3 A3
#define I4 A4
#define I5 A5

// constants won't change. They're used here to // set pin numbers: const int buttonPin = I0; // the number of the pushbutton pin const int ledPin = O0; // 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);     


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 == HIGH) {     
   // turn LED on:    
   digitalWrite(ledPin, HIGH);  
 else {
   // turn LED off:
   digitalWrite(ledPin, LOW);