Distance - Color RGBLED + Distance sensor HC-SR04 (having strange results)

Ok, so writing the data is a bit more interesting. I just tried and something like this should work:

var data = new Uint8Array(64); // you don't have to send all 512 bytes if you don't want to
Serial1.setup(250000,  {tx:B6,bytesize:8,parity:'none',stopbits:2});
// ...

function sendPacket() {
  // Do the Mark after Break
  digitalWrite(B6,0);
  pinMode(B6, "output"); 
  pinMode(B6, "af_output");
  // Send data
  Serial1.write(data);
}

setInterval(sendPacket, 100);

The timing isn't spot on, but I think it should be good enough for most DMX receivers.