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Re: [Paparazzi-devel] Using Thermopiles for AHRS on Lisa/M instead of IM

From: Prof. Dr.-Ing. Heinrich Warmers
Subject: Re: [Paparazzi-devel] Using Thermopiles for AHRS on Lisa/M instead of IMU
Date: Tue, 03 Apr 2012 09:28:43 +0200
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; de-DE; rv:1.4) Gecko/20030619 Netscape/7.1 (ax)

Dear Chris,
piezo gyros are  normally more vibration resistive than  silicon gyros.
For example, the mikrocopter use only rubber damper when silicon gyros are used. The active (swinging) material in piezo gyros has 10..100 times grater mass than in silicon gyros.
Fubata use special kind of damper material (flame).
It is also possible that one of your sensor chips has a failure.
You can spend 56 Euro to by a sparkefun IMU with the same chips and test again to prove this. The IR AHS works, but has shown same failures in cloudy and wet weather conditions.
Sometimes it is a very  hard  and frustration work to get success.
I hope that you  fly with paparazzi soon.


Heinrich Warmers

Chris Wozny schrieb:


For reasons outside of my power (trying to dampen vibrations in tiny,
tiny aircraft leads to massive hair loss and frustration) I've got to
resort to using IR for the AHRS on our aircraft instead of Aspirin
v1.0. We're using Lisa/M and I was wondering: are there any default
assignments for which ports to use for thermopiles like with Tiny? The
wiki says there should be, but I have a feeling Lisa was designed
without thermopiles in mind since an IMU would work much better.

Also, why do analog gyros (more specifically Futaba Mini Piezo gyros)
work great for stabilizing the same plane with the same vibrations
that cripple the use of Aspirin v1.0 for AHRS?


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