Arduino light sensor example

index.js

const five = require('johnny-five')
const board = new five.Board()

board.on('ready', () => {
  console.log('ready!')
  const led = new five.Led(11)
  
  const photoResistor = new five.Sensor({
    pin: 'A2',
    freq: 100
  })

  photoResistor.on('data', function () {
    const resistance = this.value
    const brightness = Math.min(Math.max(0, (resistance - 700) / 300 * 255), 255)
    led.brightness(brightness)
  })
})