What error messages are you getting?
What Arduino are you using?
What version of the Arduino IDE are you using?
Since you have uploaded the sketch, I assume, you can connect to the Arduino IDE. Is this correct?
If yes, open the serial monitor (9600) and enter <HELLO> you should get a HELLO back. You can also try <VERSION>
In the dropController app, is the dropController device COM port showing in the COM port list?
You are the second person to report connection problems so it may be that something has changed somewhere.
- This reply was modified 4 years, 6 months ago by Martyn.