What you probably want is a PIR sensor (Passive InfraRed) like those
used in motion sensitive porch light fixtures. Here's one example:
http://www.sparkfun.com/products/8630

Note that they detect low-freq IR (around 10nm) which is what mammal
bodies radiate, and they need a differential signal from motion so
if you stand still (or wear a heavy parka) they may not fire.

MS

Geo Gkolfin wrote:
> Hello everybody!
> I am using tinyOS -2.1.0 and telosb motes. I need to detect human 
> presence, so I wonder if there is something like an occupancy sensor.
> Thanks in advance!
> Best regards, 
> Georgia
> 
> 
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