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Simple Motion Alarm Using PIR Sensor 🔔#security
This simple motion alarm circuit detects movement using a PIR (Passive Infrared) sensor. When motion is detected, the PIR output activates a BC547 transistor, which powers the buzzer to sound an alert. It’s powered by a 9V battery and works great for home or room security. The circuit is easy to make and needs only a few components ...
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