Simple Light Sensor Circuit

A light sensor circuit activates when light is detected by the circuit. The second circuit has a relay as an additional component.

transistors - Simple darkness sensor with ldr - Electrical Engineering Stack Exchange

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Simple Light Sensor Circuit

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Simple Light Sensor Circuit with Applications

Simple Motion Sensor Alarm & Light

I'm making a simple dark sensor project with a light dependent resistor (LDR) and I want to replace the LED with a buzzer but it doesn't work - Electrical Engineering Stack Exchange

How To Make Light Sensor Circuit, DIY Light Sensor Using LDR & Photodiode, Simple DIY Projects