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Re: [Paparazzi-devel] Magnetometer behavior

From: Hector Garcia de Marina
Subject: Re: [Paparazzi-devel] Magnetometer behavior
Date: Sat, 29 Nov 2014 10:46:04 +0100

Maybe this could be helpful for the hardware.

When I find a magnetometer not responding, one possible reason might be related with the "pump capacitor" (in the case where it is required). Normally this capacitor is a tantalum one. Depending on the quality of such capacitor, its series resistor might change dramatically with low temperatures, leading to a malfunction on the magnetometer.

On Nov 29, 2014 2:15 AM, "Sergey Krukowski" <address@hidden> wrote:
Hi guys!

As I understand, currently if the magnetometer freezes (for any reason), the on_mag_event function will not be called anymore, which leads to slow (or even not slow) drift of yaw angle and resulting spinning of the rotorcraft. Which could be worse for possible failsafe recovery (because even in attitude mode the rotorcraft will spin around), rather than updating the ahrs with the last received magnetometer values (in that case the yaw angle will stay constant and the rotorcraft at least won't spin itself).
If I understand it right, what do you think about possible changing of the ahrs architecture in that case or should it better be done on particular boards IMU level?

Best regards,

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