Dark detector is an application which detects the light in surrounding with the help of a light dependant resistor (LDR) or also known as photo resisotrs. In this project, a square wave generator is created using 555 timer IC based astable multivibrator, and a LDR is interfacing with it. When there is no light in surrounding, or in this case when room light is switched off, the resistance of LDR is increased which makes the LED glows which is connected with the output IC of circuit.
Check out the circuit diagram of dark detector and explanation at Circuit Digest.
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