Adafruit 8x8 LED Backpacks

@chalkers thanks! You know you can use Espruino's built-in graphics library, rather than using your own?

var g = Graphics.createArrayBuffer(8,8,1);
// g.buffer is now a Uint8Array with 8 bytes, one for each row
// You might even be able to use your existing code with matrix.drawBitmap(g.buffer)

It's got rotation, fonts, lines, etc etc.