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Altitude changing, spikes in Acc logs, Temperatur drifting

Posted by Bjoern Kellermann on February 16, 2014 at 6:17am

Setup:

Pixhawk 2.4 with ArduCopter 3.1.2

Frame: 3DR Y6 with new black 850 KV motors, 3DR ESCs SimonK, 3DR PowerModule, 3DR Radio 433 MHz

Power supply: Manson HCS-3602  set to 12V

Radio: FrSky Taranis with X8R connected using SBUS

Hello,

 

I put my copter on a table in a heated room with closed windows. The copter had physical connection to power supply only. Notebook used 3DR radio to connect.

I noticed strange measurements.

- altitude is changing all time (copter was standing on the table without movement)

-- CTUN:Alt appr. 1.5m

-- CTUN:BarAlt appr. 1.5m

- Raw temperature is increasing constantly appr. first 10 minutes after start

- Several measurements have severe spike, some go to zero, others to very high number (thousands)

- AccX, AccY and AccZ have severe spikes (up to pos. and neg. several thousand!)
  beside the spikes and while motors are spinning, the range is 10 times better (x/y: -0.2 to +0.3) to acceptable range (-3 to +3) (see http://copter.ardupilot.com/wiki/ac_measuringvibration/)

Are these spikes common or Is my pixhawk defect? I had similar spikes with older firmware versions.

Please find attached my simple solution for dampering. I put M3 vibration damper between the frame and the whole platform with pixhawk. Additonal the pixhawk is on mounting foam provided by the kit.

 

BR

Björn

2014-2-16_12-30_2.log

Bildschirmfoto 2014-02-16 um 13.51.26.png

Y6_dampering.jpg

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Tags: altitude, log, pixhawk, spike, temperature, vibration
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Replies

  • Bjoern Kellermann February 22, 2014 at 12:48pm
    Hi Meno

    APM Planner 2 detects and downloads it from Internet.

    BR

    Björn
    • Bjoern Kellermann > Bjoern Kellermann February 23, 2014 at 11:48pm
      Hi Menno, no. I did not edit the code nor compile APM:Copter myself. It should be 3.1.2 from stable stream. BR Björn
    • Menno Hochstenbach > Bjoern Kellermann February 22, 2014 at 2:40pm

      But is there a way to edit this code (put usercode in it and/or add flightmodes etc.) and build your own code for pixhawk?

      Thanks

  • Menno Hochstenbach February 22, 2014 at 6:06am

    Hi Bjoern, how did you build and upload ArduCopter v3.1.2 to Pixhawk?
    Thanks, Menno

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