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Ok I am a little new to this world I would like to set up an alarm to warn me when someone is ...


G+_Alex B
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I have a PIR sensor at the door in my office that points down the hall. When someone gets a few feet away it triggers a light on my desk to warn me that someone is about to step in.

 

There were a couple of months where I had to work with my back to the door and this kept me from getting surprised when someone slipped in quietly.

 

Been meaning to do a write-up about it. Powered by an ATmega 328. If I did it again I would use an Arduino nano clone.

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