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Don't know if this will help but i found this:

http://outroot.com/blog/2010/01/10/airwick-motion-sensor-pir-with-an-arduino/

I don't know what voltage is required to trigger the relay you're using. If you pull the board out and power it via the 3v and the led lights up when you move in front of the sensor, you should be able to just solder a set of leads to the led terminals and trigger the relay.

In theory. :)
 
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