johnny-five/eg/led-rgb-keypress.js

The JavaScript Arduino Programming Framework.

var five = require("../lib/johnny-five.js"),
  keypress = require("keypress");


five.Board().on("ready", function() {

  // Initialize the RGB LED
  var led = new five.Led.RGB({
    pins: {
      red: 3,
      green: 5,
      blue: 6
    }
  });

  // RGB LED alternate constructor
  // This will normalize an array of pins in [r, g, b]
  // order to an object (like above) that's shaped like:
  // {
  //   red: r,
  //   green: g,
  //   blue: b
  // }
  //var led = new five.Led.RGB([3,5,6]);

  // Add led to REPL (optional)
  this.repl.inject({
    led: led
  });

  // Turn it on and set the initial color
  led.on();
  led.color("#FF0000");

  // Listen for user input to change the RGB color
  process.stdin.resume();
  process.stdin.setEncoding("utf8");
  process.stdin.setRawMode(true);

  var keymap = {
    r: "#FF0000", // red
    g: "#00FF00", // green
    b: "#0000FF", // blue
    w: "#FFFFFF" // white
  };

  process.stdin.on("keypress", function(ch, key) {

    if (!key) {
      return;
    }

    if (keymap[key.name]) {
      led.color(keymap[key.name]);
    } else {
      led.off();
    }

  });

});