Not sure I understand the recommendations connecting the BT receiver to the FSESC UART2 port (1) connector with 4 wires. The easiest way to power and send control to the FSESC is via its’ PPM port (2) connector, 3 wires are all I needed. Port/cable 2 (in the simple Flipsky diagram) is Pulse Position Modulation (PPM), there are 2 outputs PPM1 and PPM2 on the BT board. If you are unfamiliar with PPM, it’s a 3 wire interface that drives both manual servos & ESC in boats, planes and heli’s.
I connected PPM port (2) on the FSESC to PPM1 output from the BT receiver which has the following 3 cables:
- black - ground
- red - 5V (5.12V when I tested my rig)
- white - pulse position control signal
Also, FSESC PPM port (2) connector gave me plenty of power to drive the BT receiver board. I setup a cable as shown in the paper instructions from flipsky. GND, 5V, PPM1. I then used FSESC AUX port (8) to drive my 12V water pump.
Am I misunderstanding the advice to use UART2?