I'm looking for suggestions for making a rain sensor using Infra-=
 Red
techniques.

So far I've tried using a TIL139 emitter/detector package with=
 very
little success and I've tried matched Schmidt trigger detector=
 and
emitter form QT now Fairchild.
I have had better success with this except it only works face on=

placing emitter and detector at 45 deg to each other with glass
perpendicular to both no result at all whether wet or dry.

Should I perhaps try a modulated approach - if I wanted a mud=
 spatter
detector then no problems both setups work.

Failing this I thought of trying a different tack - Piezo sensor=
 to
detect rain dropping on it -

This will be going to a PIC has anyone any other suggestions

Thanks

Colin
--
cdb, cdb@barnard.name on 31/03/2002

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads