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Re: [Paparazzi-devel] LisaL/Aspirin IMU Issues

From: Prof. Dr.-Ing. Heinrich Warmers
Subject: Re: [Paparazzi-devel] LisaL/Aspirin IMU Issues
Date: Tue, 20 Dec 2011 14:09:51 +0100
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; de-DE; rv:1.4) Gecko/20030619 Netscape/7.1 (ax)

Hello Banett,
some Questions:
Where the motor ruining? Then 5 to 20% full scale vibration is normal.
Is this a temperature problem ? Test it with cooling and hot air. Sometimes the plastic of the mens  has large humidity and this results in contact problems by the soldering and destroy the chips.

Luke Barnett schrieb:
Hello Everyone,

I'm new to paparazzi and have been trying to get a quadcopter with Lisa/L and Aspirin IMU working over the last few months. However, I have noticed that after a period of time that I the quadcopter would seemingly lose orientation. For example the pfd would suddenly change orientation even when the quadrotor was on the ground. Luckily this has only happened a few times whilst actually flying.

I have been benchtesting the setup out of the airframe and have been able to replicate the issue quite easily by just leaving running on the bench. After a period of time (so far between 8 and 14 minutes run time) it occurs again and what I have notices is that the raw accelerometer readings go haywire around the same time. Prior to this everything seems to  be behaving normally. I've attached a screenshot of the logs to illustrate what is happening.

Does anyone have any ideas what may be causing this?  Any help would be appreciated.

Thanks and Regards

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