alan smith wrote:
>   So, looking for thoughts on how to get rid of the holes in the sensing field. The answer might be obvious, but you know how it goes...after staring at the problem for so long, you cant see the forest for the trees.

Transmit on 1 LED at a time, receive on ALL LEDs with A/D rather than 
on/off, and calibrate to see what profile you get when nothing's in the 
way.  Then recognize a suitable departure from that profile as 
"interrupted."

Suitable departure might mean, e.g., "Any individual sensor is more than 
1 standard deviation away from the mean during calibration."  Or not...
-- 
Timothy J. Weber
http://timothyweber.org
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist