Model No. 203: The main objective of this project is to design a system where light will remain on only from dusk to dawn.This system is based on an LDR, it senses the change in intensity of light and its output changes accordingly. The output of the LDR is fed to a 555 timer in a stable mode, which switches on light during dusk and switches off at dawn. 555 timer controls the load through a TRIAC.

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