Automatic Street Lights Control using LDR And BJT

Automatic Street Lights Control using LDR And BJT

To control Street lights automatically is a very interesting and very basic components Project for students and daily life hobby engineers.

This Project sense the light intensity through LDR (Light Dependent Resistor) which control the Biasing of BJT to ON or OFF Transistor as switch. One SPDT (Single Pole Double Through) is connected at collector terminal of the transistor. When BJT ON the pass a required and calculated current (Ic) through Relay and Relay activate to ON Street light which operating on AC 220v.
We can use any other type of load also here like Main gate light etc.
All values of the components mentioned in the circuit diagram. 

• Circuit diagram: