I am currently working on a drone project and I am puzzled about PPM encoder? I am still curious as to why we need to use PPM encoder and what are the benefits of it? From my research, I found out that PWM signal only cares about 1 signal at a time while the PPM encoder will update changes to many signals at a time since it has more channels. I need to know more about it so please lend me a helping hands.
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The Pixhawk has a PPM input. PPM uses one line and ground. PPM is the natural way the channel data is transmitted via radio. RC receivers have logic to convert PPM to PWM for servo outputs. Servos need PWM, so a line for each servo. It's just more efficient to have one PPM line with all the channels than many PWM lines whith one channel each going into the flight controller. A lot of receivers can be configured for PPM output. If you have one then you don't need a separate PWM to PPM encoder.