Getting started with Pixhawk 4 and Ardupilot

Correct wiring can make things so easy 😉

On the picture in the right you can see how not to wire the Pixhawk to the power management board, in case that you use the FMU outputs at the PMB

In order to have in my case a functional PWM Servo output we have to wire from PI4 I/O Output to PMB FMU IN port

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