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'[PIC]:ADXL202'
2002\12\06@210535 by Goring, Steve

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Hi List ...

I have been working with the adxl202 accelerometer to measure pitch and
roll in a small robot. Seems to be working ok ..

However, temperature affects the sensor cruelly and I was wondering if
anybody who has worked with this thing before has a an algorithm that
may reduce the temperature affects ...

I am using the PWM o/p and I know both t1 and t2 change with temp and
are reasonably linear to apprx 40deg but then it gets harder.

So if anybody has some ASM code that I could peak at I would be extremely
grateful

Thanks


Steve




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2002\12\06@211604 by Andy Kunz

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>However, temperature affects the sensor cruelly and I was wondering if
>anybody who has worked with this thing before has a an algorithm that
>may reduce the temperature affects ...

You are better handling this in hardware.  Use of proper components
(diodes, for example) that can provide similar tempco's to compensate will
help.

Andy

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2002\12\07@125735 by Patrik Husfloen

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I'm not sure if this applies at all, but it looks like it might

http://www.maxim-ic.com/appnotes.cfm/appnote_number/695

/patrik

Goring, Steve wrote:

{Quote hidden}

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2002\12\10@125755 by John Walshe

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Steve,
   If I'm not mistaken there is an App note on the Analog website
indicating how to use the ADEL signals to measure temperature. IIRC it had
some effect on the frequency of the signal from the ADEL. It seems to me
that if you are already measuring the X&Y signals then you have all the
information you need to compensate in the code for the temperature effect.

John

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