Motion Buzzer

thingiverse

I built this simple motion-activated buzzer to keep my mischievous cat off the counter. The circuit consists of a HC-SR501 IR motion sensor, a 5V buzzer, an optional Arduino, and a 9V battery. To activate the buzzer, simply connect it directly to the sensor's output pin. Alternatively, an Arduino can be used to control a piezo buzzer and add features like delay timers.