I use small PIR sensors that are $3 US each from www.glolab.com.
They provide a drawing of a fairly simple circuit based on a CD4538 & LM324
that works very well.

Chris

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Richard Sloan
> Sent: Thursday, March 14, 2002 9:35 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [EE]: Cheap Person Sensor
>
>
> If you wanted to trigger a small point of sale device to talk
> to passerby's in the shopping market what sensor would you
> use that was inexpensive?
>
> Richard.
>
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