I hadn't considered electrical foam, though I had considered a=
 cheap
strain gauge with the theory that rain must weigh something so if=
 it
fell on the sensor etc, which is where the piezo idea came from.

This is just to detect rain. I've suddenly though that maybe I'm=

using the wrong type of IR emitter so I'm going to try a high=
 power
remote control type rather than a 4mm mouse wheel type.

Just one other question I am working on the assumption of a=
 constant
beam with rain causing the beam to be either diminished or non
existent, but should I perhaps be looking at it the other way -=
 no
beam and the rain causes reflectivity?

thanks for your help

Colin
--
cdb, bodgy1@optusnet.com.au on 04/11/2002

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