Important Things to be Watch While Powering The Encoder:
The jumper JP1 has been included to provide some flexibility in the way you power the receiver, servos, and PPM Encoder. Often the power for the receiver, servos, and PPM Encoder will come from the autopilot board.
In this case, JP1 should be in place (shorted).
On another way, if the receiver or any servos directly connected to the separate/additional power source and the autopilot’s +5V is also connected to the PPM Encoder via the PPM connector – THEN YOU MUST REMOVE jumper JP1. This will isolate the autopilot power supply from the separate receiver power supply. Failure to remove JP1 will likely damage the autopilot’s +5v switching regulator!
Important Note: The firmware comes pre-configured to read 8 Channels. In case you would like to change the settings of the PPM encoder to invert the PPM signal and change the fail-safe pre-defined values you will need an AVR ISP programmer in order to reprogram it.