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PIR Motion Sensor Alarm Circuit/Motion Activated Security Alarm
This is a simple Motion Activated Security Alarm circuit made using a PIR motion sensor, BC547 transistor, resistor, buzzer, and a 9V battery. When any motion is detected within the sensor’s range (up to 180°), the PIR sensor gives an output signal that activates the transistor, which turns ON the buzzer and produces an alarm sound. This ...
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