Demo: Push Button

Every second, the program will check if the user has pressed the push button. If the push button is pressed, it will turn the LED on.

Code run restore

var b = require('bonescript');
b.pinMode('P8_19', b.INPUT);
b.pinMode('P8_13', b.OUTPUT);
setInterval(check,100);

function check(){
b.digitalRead('P8_19', checkButton);
}

function checkButton(x) {
  if(x.value == 1){
    b.digitalWrite('P8_13', b.HIGH);
  }
  else{
    b.digitalWrite('P8_13', b.LOW);
  }
}

Build and execute instructions

• Connect the cathode side of the LED with a 470 ohm resistor in series, then to ground.
• Connect the anode side of the LED to 'P8_13.'
• Connect one side of the push-button to P'9_3' and the other to 'P8_19.'
• Run the example code. If the push button is pressed, it will turn the LED on.

See also

Topics

• BeagleBone expansion headers
• Digital I/O
• Timers

Related functions

• require
• pinMode
• digitalWrite
• digitalRead
• setInterval

Where to buy

• BreadBoard
• External LED
• Jumper wires
• Push button
• Resistors