johnny-five/docs/led-matrix.md

The JavaScript Arduino Programming Framework.

# Led Matrix

Run with:
```bash
node eg/led-matrix.js
```


```javascript
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
  });

});

```


## Breadboard/Illustration


![docs/breadboard/led-matrix.png](breadboard/led-matrix.png)
[docs/breadboard/led-matrix.fzz](breadboard/led-matrix.fzz)









## Contributing
All contributions must adhere to the [Idiomatic.js Style Guide](https://github.com/rwldrn/idiomatic.js),
by maintaining the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code using [grunt](https://github.com/cowboy/grunt).

## License
Copyright (c) 2012 Rick Waldron <waldron.rick@gmail.com>
Licensed under the MIT license.