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
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amerdsp
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A string tied to a switch.

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Tim Wescott Wescott Design Services

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Posting from Google? See

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Tim Wescott

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

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larwe

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