onoff/examples/blink-led.js

GPIO access and interrupt detection with Node.js

'use strict';

const Gpio = require('../onoff').Gpio; // Gpio class
const led = new Gpio(17, 'out');       // Export GPIO17 as an output

// Toggle the state of the LED connected to GPIO17 every 200ms
const iv = setInterval(_ => led.writeSync(led.readSync() ^ 1), 200);

// Stop blinking the LED after 5 seconds
setTimeout(_ => {
  clearInterval(iv); // Stop blinking
  led.unexport();    // Unexport GPIO and free resources
}, 5000);