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Re: [Paparazzi-devel] Drotek imu calibration problem

From: Chris
Subject: Re: [Paparazzi-devel] Drotek imu calibration problem
Date: Wed, 10 Apr 2013 15:02:18 +0300
User-agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130308 Thunderbird/17.0.4

Hi Felix
I checked the scaled values and it was over 20m/s so i switched to the calculated defines

<define name="ACCEL_X_NEUTRAL" value="61"/>
<define name="ACCEL_Y_NEUTRAL" value="6"/>
<define name="ACCEL_Z_NEUTRAL" value="-67"/>

<define name="ACCEL_X_SENS" value="4.87542830698" integer="16"/>
<define name="ACCEL_Y_SENS" value="4.89064537368" integer="16"/>
<define name="ACCEL_Z_SENS" value="4.81527520369" integer="16"/>

With the above values i get 9.81m/s but the artificial horizon starts to drift immediately and after 10 seconds is upside down. With the older values it worked ok i think but the scaled values were just above 20m/s (the neutral values are ok).
What could be wrong?
Btw i obtained those values by following the directions in the wiki (create log files etc)

On 04/10/2013 04:27 AM, address@hidden wrote:
the calibration result looks good. Did you create the log with the same
To check your scale, please switch telemetry to scaled_sensors and make
sure you get -9.81 m/s? on z when the IMU is level.

Cheers, Felix

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