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Re: [Paparazzi-devel] ADXRS300 Gyro basics

From: Volker Cordes
Subject: Re: [Paparazzi-devel] ADXRS300 Gyro basics
Date: Wed, 23 Jul 2008 17:57:09 +0200


I missed this one some 4 weeks ago:

for everyone who waited for an answer like me...


-------- Original-Nachricht --------
Datum: Sun, 20 Jul 2008 12:36:22 +0200
Von: address@hidden
An: address@hidden
Betreff: [Paparazzi-devel] ADXRS300 Gyro basics


I am about to use an ADXRS300 Gyro in my airframe.  Former IDG300 Gyro had a significant impact on GPS performance even after implementing a separate 3V3 power supply .

Is it advisable to supply it via tiny´s 5V rail ? which pins have to be connected apart from GND, 5V, Rateout ?

Can someone please comment calibration, means setting neutrals especially temperature and 2V5 reference?

Can someone also please comment the marked lines from the airframe file:

<section name="GYRO" prefix="GYRO_">
    <define name="ADC_ROLL_NEUTRAL" value="520"/>
    <define name="ADC_TEMP_NEUTRAL" value="476"/>  
->    <define name="ADC_TEMP_SLOPE" value="0"/> 
    <define name="DYNAMIC_RANGE" value="300" unit="deg/s"/>

->    <define name="ADXRS300_RESISTOR_BRIDGE" value="(3.3/(3.3+1.8))"/>
    <define name="ADXRS300_SENSITIVITY" value="5" unit="mV/(deg/s)"/>
->    <define name="ROLL_SCALE" value="3.3*1000./1024./(GYRO_ADXRS300_SENSITIVITY*GYRO_ADXRS300_RESISTOR_BRIDGE)" unit="deg/s/adc_unit"/>

    <define name="ROLL_DIRECTION" value="-1."/>

Anything else to setup and care for?

Thanks a lot

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