Security Alarm Circuit | Circuitspedia.com

Darkness detector | Shadow alarm circuit

Light sensor circuit Shadow detector A Buzzer beeped and led will glow for a fixed time when a shadow falls on a phototransistor. This is a very sensitive light-sensitive circuit operated using the 741 opamp ic and 555 timers. Here 741 ic is connected as a comparator which compares the voltage at the input. […]

Automatic Room Light And Security Alarm circuit Using PIR Motion Sensor

Motion Sensor Project

PIR Motion sensor Alarm circuit Automatic Wash Room Light using PIR Motion Detector and Automatic Light Security Alarm Circuit using PIR Sensor. In This Circuit PIR (Passive infrared ) Motion Sensor Is used which is used as a motion Detector. When Any Person, Animal Or Any Object Comes In The Range of the sensor. then

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