photoresistor-light.js

var five = require("johnny-five"),
  board = new five.Board();

  five.Led.prototype.greaterThanSize = function(value){
    if (value > this.threshold) {
      this.on();
    } else {
      this.off();
    }
  };

board.on("ready", function() {
  // Define LED's
  var led25 = new five.Led(13),
  led50 = new five.Led(12),
  led75 = new five.Led(11),
  led100 = new five.Led(10);

  led25["threshold"] = 1;
  led50["threshold"] = 25;
  led75["threshold"] = 50;
  led100["threshold"] = 75;

  // Range of the scale to measure to light up LED's
  var range = [0, 100];

  photoresistor = new five.Sensor({
    //pin to listen to
    pin: "A0",
    //how often to check for a change in miliseconds (default value is 25 milliseconds)
    freq: 150
  });

  this.repl.inject({
    led25: led25,
    led50: led50,
    led75: led75,
    led100: led100,
    pot: photoresistor
  });

  photoresistor.scale(range).on("data", function() {
    //outputs to screen the values being used from the photoresistor
    console.log( "analog value: " + this.analog + "  Scaled Value: " + Math.floor(this.scaled) );
    var scaledData = Math.floor(this.scaled);

    ledArray = [led25,led50,led75,led100];

    for (var i = 0; i < ledArray.length; i++) {
      ledArray[i].greaterThanSize(scaledData);
    };

    // if (Math.floor(this.scaled) > 1) {
    //   led25.on();
    // } else {
    //   led25.off();
    // }

    // if (Math.floor(this.scaled) > 25) {
    //   led50.on();
    // } else {
    //   led50.off();
    // }
    // if (Math.floor(this.scaled) > 50) {
    //   led75.on();
    // } else {
    //   led75.off();
    // }

    // if (Math.floor(this.scaled) > 75) {
    //   led100.on();
    // } else {
    //   led100.off();
    // }
  });
});