Servers by jDrones

Pixhawk 2.1 power questions


(Dude) #21

I am using this method. [Reason why is it’s a Rover - I want RC transmitter only controling for shifting and locking diffs etc. - Then the Pixhawk can controller throttle steering ]
From PH2.1 RC in (that also supply’s a ~5v out hence giving power to the servo rail on your reciever ) Just unplug the ~5v RC in lead and pull it out to your ph2.1 servo rail that is powered by your battery ESC or Bec. Now the reciever is powered by your battery etc. Instead of the RC out. Someone correct me if I’m wrong but you just need signal and ground from RC in- I don’t know about the little ground loop you create (ground from Pixhawk touching ground from ESC battery or bec at the reciever could end up with different potentials?)


(Kevin Klemens) #22

Can you power the servo rail via the S.Bus port? On the Pixhawk 1 you could and I’ve been trying to figure out if its possible so I don’t have to waste a servo channel.

There’s this mention in the Pixhawk 2.1 specifications guide:
“S.Bus and CPPM receivers powered directly from the servo rail, and must support the servo supply voltage.”


(Marc Dornan) #23

Try a continuity test both ways (to make sure there is no diode). If it checks out you are likely ok unless the track on the PCB is tiny and you have lots of hefty servos.


(Kevin Klemens) #24

Confirmed, the S.Bus works fine to power the servo rail.