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Pixhawk (HKPilot32) delivers only 1 V instead of 3,3 V on connectors

Posted by Thomas Schmitt on December 11, 2015 at 3:55am

Hi all,

some days ago i started to configure my HKPilot32 which i had bought some months ago  on Ebay (together with some other stuff). I am using APMs for a while and wanted to get some of the new features which are in V3.3 (landing gear, kill switch).

First thing i recognized was that the connected GPS was not working. Drilling into this i found out that the voltage between VCC and ground on the connectors is only 1V instead of 3,3 V which explained why the GPS does not work. Situation is the same with USB or Power Module.

I have to say all other functions of  the module work as expected only the peripheral voltage is an issue.

In the older days of APM there were lots of comments about the voltage splitter burning away and also manuals how to fix that by using a more robust one.

Is this issue also known for the Pixhawks (Or especially for the HKPilot32)? Does somebody have a hint where i can find this splitter on the pixhawk board and how to test/exchange it? Are there may other reasons for this voltage drop?

Thanks for your help and happy flying!

Thomas

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Replies

  • Andre K. December 14, 2015 at 11:36pm

    there is no "voltage splitter"  - I guess you mean "regulator".

    Yes, it may be fried, or something else is, and it's overloading it.

    No , it's not usual to have such trouble, if it's only the regulator, then it's trivial to replace, but SMD rework station/hot air is easier than a soldering iro most people have.

    • Thomas Schmitt > Andre K. December 15, 2015 at 3:53am

      Hi Andre,

      thanks for your reply. Yes you are right i mean the regulator and i also made a mistake with the voltage. Between GND and Vcc should be 5V (not 3,3V).

      In the meanwhile i found out that one of the telemetry ports (Nr.1) still delivers 5V between these pins but all the others don't. So i use this port for the GPS which works fine after setting the right software parameters.

      However it is still strange to me that all the other three telemetry ports (incl. GPS port) do only deliver 1V instead of 5V.

      If somebody has an idea which module may cause this pls let me know! As far as i can see the board and the connectors are without any damage.

      Cheers Thomas

      • Andre K. > Thomas Schmitt December 15, 2015 at 4:39am

        not all serial/telemetry connators 5v is from the same source, (at least on 3DR pixhawk)

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