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Canby, OR
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I want to wire up an alarm sensor on my window so my arduino will know when it's opened. I can't run wire to the sensor so it needs to be wireless. I know you can get DIY wireless window kits that run on batteries and last years before you have to change the battery.

How would I do that with an arduino? All I need to know is "is the alarm sensor tripped" so I think an XBee is way overkill. How can I do something like this in the most battery efficient way possible?
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Canby, OR
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Something like one of these...

http://www.smarthome.com/59482/GE-45131-Choice-Alert-Window-Door-Sensor/p.aspx

I'm mainly worried about battery life.
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Canby, OR
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I was wondering if you'd need a microcontroller at the window end to control the wireless.

Those items from goldmine would be PERFECT. I wonder what it would take to get an arduino to receive a signal from them.
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Greenwood, Indiana
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You can do that with a simple magnetic reed relay a wall wart and something to make sound.
http://www.amazon.com/Universal-Buzzeralarm-Buzzer-Hazard-Warning/dp/B002IVAJMS
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You may want to look at hacking a cheap wireless doorbell like below. Walmart use to have them for ~$10. Has both transmitter and receiver included.

http://www.google.com/products/catalog?hl=en&num=100&safe=images&q=wireless+doorbell&cid=681528437267262088&ei=ASNSTJSSNIG0xQWDhsHHBA&sa=title&ved=0CEUQ8wIwBzgA#p
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Canby, OR
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Zoomkat I love that idea! Genius!
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