johnny-five/eg/led-matrix.js

The JavaScript Arduino Programming Framework.

var five = require("../lib/johnny-five"),
  board, lc;

board = new five.Board();

board.on("ready", function() {
  var led = new five.Led(13);
  led.on();

  var heart = [
    "01100110",
    "10011001",
    "10000001",
    "10000001",
    "01000010",
    "00100100",
    "00011000",
    "00000000"
  ];

  lc = new five.LedControl({
    pins: {
      data: 2,
      clock: 3,
      cs: 4
    },
    devices: 1,
    isMatrix: true
  });

  function queue(fn) {
    process.nextTick(fn);
  }

  lc.heart = function() {
    heart.forEach(function(row, rowIndex) {
      queue(function() {
        lc.row(0, rowIndex, parseInt(row, 2));
      });
    });
  };

  lc.on(0);

  var msg = "johnny-five";
  var idx = 0;

  function next() {
    var c = msg[idx];
    lc.char(0, c);
    idx++;
    if (idx === msg.length) {
      return;
    }
    setTimeout(next, 800);
  }

  next();

  board.repl.inject({
    lc: lc
  });

});