OT- PIR motion sensor - ideas?

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#1
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Hey there people, I have just completed building a DSI lighting ballast controller, part of the controller involves triggering from an external source such as a motion detector, momentary switch- whatever (240v or 5v). (triggers a ATMEGA8 interrupt)

Currently I want to use a PIR motion detector as its trigger, however I am running into problems deciding on what PIR to use.

The PIR is to be situated in a pathway that is 2.1m wide, so it only needs to detect over a narrow distance, however the acceptance angle in Plan view needs to be fairly wide.

_____________________PIR______________
/|\ /wide \
| / \
2.1m
|
\|/____________________________________

Ideally I want to use a PIR detector that is small, and perhaps can even be mounted in a weatherproof/vandalproof vessel of some sort (if it doesn't already fulfill this prerequisite).
Most of the security based PIRs are too large and have too big a detection area for my needs.

The detector is to be used in a commercial installation on a boardwalk overlooking the ocean - so it needs to be fairly sturdy and reliable.

Any ideas would be greatly appreciated.

Thanks.

Todd.

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Check out the following link:
http://www.kitsrus.com/pdf/kc778...

Matt

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I would suggest a SHARP IR sensor as a likely candidate.
You can get them from a number of sources, but the ones like these from www.junun.org.markiii or www.acroname.com

http://www.junun.org/MarkIII/dat...

http://www.junun.org/MarkIII/dat...

http://www.junun.org/MarkIII/dat...

http://www.junun.org/MarkIII/dat...

If you want infrared heat sensing:
http://www.junun.org/MarkIII/dat...

The little JST connectors can be had from www.junun.org as well, the connectors can be hard to get in some cases.

You can put these in a plastic container, but you'll need to test to determine whether the plastic is IR transparent or not. Some plastics are and some aren't.