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airspeed/airpressure sensor data seems to be unstable

Posted by kolyan2003 on March 2, 2011 at 4:06pm

Hi all,

I'm getting readings from airpressure and airspeed sensor that are somewhat unstable.

It happens when board powered up through USB only, BEC only, and through USB + BEC.

readings from the sensors jump from 0 to 10m/s (airspeed) and from -0.3 to 1 (altitude)

Is this behavior normal? If not - how can i fix it?

This is a screen cap of test/airspeed first, then test/airpressure second (you may need to watch it in 480p for data to be readable):

 

Plane is stable and away from vents, fans, etc.

Sensor is pmxv7002dp

 

Thanks!

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Tags: airpressure, airspeed, ardupilot, mega
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Replies

  • kolyan2003 March 3, 2011 at 5:23pm
    i took a voltmeter and connected it to power at the telemetry port: https://www.youtube.com/watch?v=U-wb5So6WE0 - voltage jumping between 4.97 and 5.07 - thats a clue!
    Unplugged Ublox gps unit - rock solid at 5.23, airpseed became solid too.

    Will try to power up GPS unit separately from APM.
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