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Ultrasonic sensor does not work properly

Posted by Georg on December 3, 2012 at 2:19am

Hey guys,


my altitude hold was working very poorly, so I decided to read out my ultrasonic data. Up to height 100 (not sure about the units here) it works fine but then the signal starts to jump at random. I was wondering if this could be some kind of disturbance? Did you have similar problems?


The Ultrasonic sensor should be fine. Tested with three different ones - every time the same problem!

Georg

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Tags: altitude, disturbance, ultrasonic
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Replies

  • Georg December 10, 2012 at 3:00am

    Solved it - not very neat but it works I think :)

    The voltage seems to be the problem. I decided to test this and took a 4.5V Battery pack (3x1.5V) and used this to power the Sonar. Now the Value in QGC stops to jump (tested it up to an altitude value of 300 - more I can not test inside...). If you want to try too, connect all the ground-cables (battery, board and sonar) for this is the reference voltage. For the sonar voltage supply use only the battery-pack. The analog signal cable do not change it connects the sonar to the board. The voltage supply cable from the board I left open. Hopefully this will not damage the board - but I don't see how.

    I will inform you when I tested this setup outdoor!

  • Bill Patterson December 8, 2012 at 7:32am
    Same problems. Subscribed.
  • Moderator
    Michael Pursifull December 4, 2012 at 3:56pm
    The ultrasonic sensor works between 20 or 30 cm min to 7-10m max range, depending on model.

    Closer, and it just reports the min distance. Beyond that, and the APM uses the barometer.

    Hope this helps.
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