How to transmitt ESC Telemetry Data through a PWM link.

[Olivier ADLER]

I've found this very interesting to transmitt telemetry Data from an ESC to the RC receiver.

The protocol is quite simple, it does transmitt a telemetry value after each PWM pulse. There are 12 differents telemetry values.


The receiver (or flight control board) need to put the PWM line in high impendance mode after each PWM pulse so that the ESC can pull the line to create a short telemetry pulse after each PWM pulse. Then this one can be measured at the other side.

The advantage is that no dedicated telemetry bus is necessary and a single wire is enough to transmitt PWM pulses and telemetry data at the same time.


Decoding this would be difficult i think for the APM, but there should be no problem with the PX4.


Joined PDF.



Olivier