gpio.js

const Gpio = require('onoff').Gpio;
const sleep = require('./sleep')

const motor = new Gpio(17, 'out')

// Run the motor connected to GPIO17 every 1000ms
let beltIsShuttingDown = false
const runBelt = async () => {
  if (beltIsShuttingDown) return

  // Dansa
  await motor.write(1)
  await sleep(500)
  
  // Pausa
  await motor.write(0)
  await sleep (1000)

  runBelt()
}
runBelt()

// Gracefully shut down motor after 15 seconds
setTimeout(async () => {
  beltIsShuttingDown = true
  await motor.write(0)
  motor.unexport()
  process.exit(0)
}, 15000)

sleep.js

module.exports = exports = async (sleepTime = 1000, resolveWith = undefined) => {
  return new Promise(resolve => {
    setTimeout(() => {
      resolve(resolveWith)
    }, sleepTime)
  })
}