Low power motion sensor

What is the motion sensor that has the lowest power consumption?
Distance is about 10 feet or so.
Any ideas?

Thank you,

A

amerdsp wrote:

> What is the motion sensor that has the lowest power consumption?
> Distance is about 10 feet or so.
> Any ideas?
> 
> Thank you,
> 
> A
> 
A string tied to a switch.

-- 

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

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"Applied Control Theory for Embedded Systems" came out in April.
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amerdsp wrote:
> What is the motion sensor that has the lowest power consumption?
> Distance is about 10 feet or so.

Try an AC-coupled CdS cell. Or a pyro.