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

[Prof. Dr.-Ing. Heinrich Warmers]

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.

regards

Heinrich Warmers

Chris Wozny schrieb:

> All,
>
> 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?
>
> Best,
> Chris
>
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