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Makers and Making: Motion Activated Sound
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kenzlo
Oct 29th 2009
I'm an artist working on a new project. The idea is to have a speaker that emits sound when someone walks past it. The goal is to have a motion sensor trigger the sound instead of a button or a switch. The budget for this is, well a budget. So any tips on how to do this cheap is better than anything else if possible. I'm a novice when it comes to motion activated things, but it's an interesting concept as an artist. Any tips would be helpful.
Odin84gk
Oct 30th 2009
Your most reliable + inexpensive solution is a PIR sensor. These are the "motion detection" units in almost all motion detection lights.

http://www.sparkfun.com/commerce/product_info.php?products_id=8630

You will probably need some kind of interface to convert this signal to what you need. If you were to use a normal switch, how would you connect it?
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