matrix.js

const UnicornHatHD = require('./unicornhat-hd');
const unicornHatHD = new UnicornHatHD('/dev/spidev0.0');

unicornHatHD.setBrightness(0.95);
unicornHatHD.clear();

let wrd_rgb = [
	[154, 173, 255],
	[0, 255, 0],
	[0, 235, 0],
	[0, 220, 0],
	[0, 185, 0],
	[0, 165, 0],
	[0, 128, 0],
	[0, 0, 0],
	[154, 173, 255],
	[0, 145, 0],
	[0, 125, 0],
	[0, 100, 0],
	[0, 80, 0],
	[0, 60, 0],
	[0, 40, 0],
	[0, 0, 0]
];

let bpp = [
	[Math.floor(Math.random() * 16), 15]
];
let y;

function draw(i) {
  for (let i in bpp) {
    y = bpp[i][1];
    for (let rgb in wrd_rgb) {
      const color = wrd_rgb[rgb];
      if (y >= 0 && y <= 15) {
        unicornHatHD.setPixel(bpp[i][0], y, color[0], color[1], color[2]);
      }
      y += 1;
    }
    bpp[i][1] -= 1;
  }
  unicornHatHD.show(false, false);

  if (i % 5 == 0 || i % 7 == 0) {
    bpp.push([Math.floor(Math.random() * 16), 15])
  }

  while (bpp.length > 100) {
    bpp.shift();
  }

  setTimeout(() => {
    draw(++i);
  }, 100)
}

draw(0);