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Doorbell, repurposed | by Roo Reynolds
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Doorbell, repurposed

This board now takes its 3 volts from the Arduino instead of 2 AA batteries. It still receives the signal from the remote doorbell button, but now the signal to the buzzer is received as an analog signal by the Arduino, which sends a message down the USB cable to the attached computer. Of course, the other chime unit still goes "bing bong" as normal.

 

rooreynolds.com/2008/05/14/hacking-the-doorbell/

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Taken on May 13, 2008