AVR-Chat

At 04:54 PM 9/11/05 -0700, Ken Holt wrote:
>I second Larry's suggestion for using IIR filtering.  I use a sequence
>of them for
>my noisy accelerometer applications, (as well as other sense inputs),
>and gain
>flexible low-pass filtering and increased resolution.  They are very easy to
>implement in AVR.

They may be easy to implement but you still need an external hardware 
filter.  Particularly if you have a 'noisy' signal and or impulse noise.  A 
simple RC can give you a low pass sufficient to allow SW filtering to 
handle the rest but you must remove or at least reduce the frequencies 
above the Nyquist frequency.

Robert


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