Gene Heskett wrote: > > I tried that too Andy, but the 'gain' had to be cranked into the .001 range > to get a value that only had the last 5% in it, and at that gain, the > settling time was many seconds. The basic problem there is that the last > value clocked in is 50% weighted. If the whole thing was a shift register > that read out in parallel, so an instant value variation if the gain was > .25, would only contribute 25%, with the old value shifted out to null. > That would absorb a lot of the digital noise by averaging the mechanics out > over 4 edges, and would settle fast enough to be usable. The lowpass does > not. But here is a thought. The lowpass can be 'loaded', then allowed to > drift as needed, if we can figure out when to enable the load pin. The $64 > question, that. > It would not be hard to write a 4-stage boxcar averager HAL component that does what you want.
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