piclist 1999\10\12\161514a >
Thread: Dust measurement (with a PIC attached)
face BY : Chris Fanning email (remove spam text)

> I think one good idea is just using two LEDs and Two photosensors. One
> pair will have a clean path (using a pipe) with the same distance of the
> pair inserted into the dusted area.  Comparing both photosensors output
> you will have a delta voltage representing somehow a "dust percentage".
> Just filter both photosensor outputs to reflect at least the last 5
> seconds of measurements, and create a table for it. Nice and easy.

Aren't there optical smoke detectors that work the same way?  This might
be an off the shelf smoke detector part...?


<199910122013.QAA11658@jingoro.prevmed.sunysb.edu> 7bit

In reply to: <3803680C.9A8A1F8A@earthlink.net> from Wagner Lipnharski at "Oct 12, 1999 12:55:40 pm"
See also: www.piclist.com/techref/microchip/devices.htm?key=pic
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Subject (change) Dust measurement (with a PIC attached)

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