Electronic Cat Repellant
This cruel project was inspired by a certain pet's
habit of using the area under my desk as a bathroom. It comprises a commercial PIR sensor relay module, fire alarm siren, and 12V power supply, all from various dumpsters. No calibration was needed; this was a highly effective deterrent as assembled. The only drawback was that the beast didn't hew to a set schedule, and 4:00AM is never a pleasant time for a fire alarm. Note the not-so-new-in-box GRiD PalmPad 2351 in the background.
Contact: reboots at g-cipher.net
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