I decided for my first tech demo to experiment with the PIR (Passive Infrared) sensor. If an inanimate object or something cold passed by the sensor, it would not react (Outputting a 0). However, if something warm blooded, such as a human or dog trying to steal my cupcakes, then the sensor would react (Outputting a 1). If the input is High (1) then the buzzer will go off, alerting me of the motion.
My Setup:
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