توضیحات:

Simple BlueTooth controller app for Arduino home experiments
The app let you choose a BT connection, then the panel includes 2 buttons and one slider dedicated to:
START / STOP and Speed control
START transfer che char 'S'
STOP transfer che char 'B'
Moving the slider causes transfer of the slider position number terminated by the char(126) '~'

The app is tested to work with HC-05 and HC-06 modules configured as transceiver 9600 bps, parity None