The Automatic Night Lamp with LDR Circuit is a straightforward and energy-efficient project designed for automatic lighting control without the use of Arduino. This project leverages a Light Dependent Resistor (LDR) to detect changes in ambient light levels, triggering a simple circuit to turn on a lamp during low-light conditions.
It offers a hands-on approach to basic electronics and can be an excellent starting point for beginners.
Component List:
| Name | Quantity | Component |
|---|---|---|
| BAT1 | 1 | 9V Battery |
| R1 | 1 | Photoresistor |
| R2 | 1 | 2 kΩ Resistor |
| T1 | 1 | NPN Transistor (BJT) |
| R3 | 1 | 330 Ω Resistor |
| D1 | 1 | Red LED |
| D2 | 1 | Orange LED |
| D3 | 1 | Green LED |
LDR Connection: Connect one leg of the LDR to the base of the NPN transistor and the other leg to the positive supply. Connect a resistor from the base of the transistor to the ground.
Transistor and Relay: Utilize the NPN transistor to amplify the current. Connect the relay to the collector of the transistor and to the lamp. The relay acts as a switch, turning the lamp on or off based on the LDR’s light detection.
The Automatic Night Lamp with LDR Circuit is a practical and cost-effective way to implement automatic lighting control without the complexity of microcontrollers.
This project provides a fundamental understanding of analog circuits, sensors, and their applications in real-world scenarios. It’s a great introduction to electronics and can serve as a stepping stone for exploring more advanced projects in the realm of automation and sensor-based systems.
