Got it working for the first time today ! It’s awesome ! Had some problems with the COM port and app is running a bit slow but it works great ! Good work!
I have 1 more question: how do I hook up a second rainbowduino so I can write whole words ? I have 2 rainbowduinos connected but can only control 1, the other one is still running another sketch. Do I have to upload the new firmware to it individually (unplug all, upload firmware, restart mtxcontrol) ?