Character modified in Bluetooth

[ChrisWard]

Hi Jon

@Jon1

Since the HC-05 is constantly sending data (motor positions every 100 milis), this must conflict when it receives something.
The HC-05 cannot send and receive data at the same time, it affect the data.

Uskiara noticed that earlier, #post58:

@uskiara

I see that you use the library SoftwareSerial to allow the real HW serial (Tx and Rx on pins 0,1 if you use a UNO) to monitor the received data on the PC. This is typical, but I'm not pretty sure how this library works when a transmission, in your case triggered by the millis() is executed while receiving was already in progress.

Think of a Bluetooth signal as water running through a pipe - it can't go in both directions at the same time. There are possibilities with an extra port on the board and a second App Inventor BT Client, but your project does not need that complexity.