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connection of gnd wire on attopilot sensor really necessary?

Posted by Asaak on December 23, 2013 at 8:43am

Hi!

I hav an APM 2.5 with a 90A attopilot sensor. I am wondering if it is really necessary to connect gnd wire coming from attopilot sensor. The thing is I have the power jumper disconnected so I have two power sources on my APM. To avoid ground loops I don't connect gnd coming out from the attopilot sensor because I understand it is the same gnd as the one on the battery wire whic in turns ends up connected to apm through the bec on the ESC. However, voltage indicator on OSD and on the ground station is very unstable, always jumping without beeing a steady value ( even when I am flying without throttle ). Do you guys think it is becuase of this?

As I said, I am powering APM through a dedicated BEC and Servos thorugh BEC coming out of my ESC ( connected to output ports of APM ).

Thank you all!

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Replies

  • iskess December 23, 2013 at 10:58am
    I have tried connecting the OSD with 1 power source and 2 power sources. I always have a jumpy voltage reading no matter what I try. I think this is due to a flaw in the way APM is made. Perhaps the Pixhawk will be better in this regard.

    I calibrate the voltage at cruise throttle. The voltage is way off at full throttle and at idle. Perhaps the Devs can allow for a curved voltage to throttle calibration by calibrating at several throttle settings. This would help.
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