hi there piclisters!


I am looking for inexpensive sensors for detecting ammonia and sulfur 
(hydrogen sulfide?). Speed and accuracy are not really important, but 
cost, power consumption and size all are. I guess i'm looking for the 
kind of thing one would use in a highschool demonstration. Something in 
a surface mount package would be really perfect.

As for output, i'll be interfacing them to a pic 12c508. I only need 
threshold detection, so i can tweak analog outputs with a comparator to 
get on/off signals for the pic.

do such things exist?


thanks!
-raphael
www.walrus.com/~raphael
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