Additionally, the battery voltage telemetry is limited to voltage the receiver gets (which needs to be between 0-5V supplied by the flight control board) and without the external port isn't really of any practical use for determining the voltage level on the battery pack.
S-BUS does look interesting and there are SBUS-to-PPM converters, and the CC3D board does appear to natively support SBUS so I'll probably use that as the starting point when I make my own quad from scratch.
SPORT is the new telemetry interface. Getting my own telemetry data back to the received will be the first homebrew project I attempt (and I might as well start with a level indicator!)
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