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What is Sensitive Light Sensor Alarm Circuit about?
The circuit described detects movement using a light dependent resistor (LDR) without needing precise light beam alignment. It will sense a person from a few meters away in daylight or indoor lighting. When a person crosses the detection area and blocks light, the LDR voltage drops, triggering a voltage comparator. This activates a monostable timer to generate an audible alarm. Proper adjustment of a preset resistor tunes the circuit to detect movement at the desired light level distance.
- Author
- Pragna Penjerla
- Language
- EN