Construction Of A Dark Activated Led Driver Circuit
ABSTRACT
This project work is on the construction of dark activated alarm. Which aimed at activating a switch or AC lamp at sunset and deactivate it at sunrise. This Dark activated Switch can trigger LDR to operate LED lamp at sunset with the help of transistors to enable switching of state. The lamp remains on till morning and then turns off. This eliminates the need of switching the Porch lamp or Backyard lamp daily and also helps to light the premises of the house when the occupants are out of station. The circuit utilizes the light sensing property of LDR to activate the circuit. The LDR (light Dependent Resistor) has very high resistance as high as 10 Meg ohms in dark which reduces to a few ohms in bright light.