Automatic Street Light Control System Without Microcontroller

Components

The system includes the following components:

1. Light Dependent Resistor (LDR): Measures ambient light levels.
   • LDR: A light-sensitive resistor whose resistance decreases as the ambient light increases.
2. Operational Amplifier (Op-Amp): Used for comparing light levels.
   • LM358: A common dual operational amplifier used for analog signal processing.
3. Relay Module: Controls the switching of the street light.
   • Relay: Acts as a switch to control the power to the street light.
4. Transistor: Used for amplifying and switching signals.
   • NPN Transistor: Acts as a switch in conjunction with the relay.
5. Resistors and Potentiometers: Set the reference voltage and adjust sensitivity.
   • Fixed Resistors: Used for biasing and setting thresholds.
   • Potentiometer: Allows for adjustable threshold setting.
6. Power Supply: Provides power to the system components.
   • AC to DC Adapter or Battery: Supplies the necessary voltage.