Tag Archives: ppm

Classic TX

I thought to give my Flysky TH9x TX a change to use it with silkopter so I made a new node called “CPPM Receiver”. This samples a CPPM stream on a GPIO and outputs the PWM streams that can be fed into the main node.

 

It uses the PIGPIO setAlertFunc which calls a user provided function for all level transitions on a certain gpio pin. The resolution is 5 microseconds which is waay more than needed for a standard CPPM stream. The gap between channels is 400 microseconds so way bigger than the minimum resolution of the library.

 

It started more of a proof of concept but in the end I think it’s perfectly usable.

Here’s a video with it in action, connected to a D8R-II receiver:

 

 

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