wolkd/screens/console.js

Server and user interface to control WS2801 RGB LED strips via SPI

var config = require(process.env.WOLKD_CONFIG);
var colors = require('ansi-256-colors');

var buffer = new Buffer(config.pixels * 3);

exports.setPixel = function(pixel, r, g, b) {
  var s = pixel * 3;
  buffer[s] = r;
  buffer[s + 1] = g;
  buffer[s + 2] = b;
};

exports.update = function() {
  for (var c = 0; c < config.pixels * 3; c += 3) {
    var r = Math.round(buffer[c] / 51);
    var g = Math.round(buffer[c + 1] / 51);
    var b = Math.round(buffer[c + 2] / 51);
    process.stdout.write(colors.bg.getRgb(r, g, b) + ' ');
  }

  // TODO: make sending carriage return optional!
  process.stdout.write(colors.reset + '\r');
};