Folks may already have seen this, but I though it might be excellent
for the stairs leds project. The PIR sensor looks as though the
detection area could be quite small - ideal.
I always had a problem with what sensing mechanism to use. Beam break
- have to hack the stairs and this detector looks relatively small
http://www.hobby-boards.com/catalog/product_info.php?cPath=25_27&products_id=75
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