Automatic Street Light Control Using LDR and Arduino

Automatic Street Light Control Using LDR and Arduino

Street lights are often left ON during daylight hours due to manual operation errors, wasting significant amounts of electricity. This project automates street light control using a Light Dependent Resistor (LDR) sensor. When ambient light drops below a threshold (dusk), the Arduino activates a relay module which switches ON the street light. When ambient light rises above the threshold (dawn), the relay switches OFF the light.

Components

Arduino Uno
LDR Sensor
Relay Module 5V
AC Bulb with Holder
Resistors and Wires

Components	Hexkart	Flipkart
Arduino Uno	Buy Now	Buy Now
LDR Sensor	Buy Now	Buy Now
Relay Module 5V	Buy Now	Buy Now
AC Bulb with Holder	Buy Now	Buy Now
Resistors and Wires	Buy Now	Buy Now

Arduino

Arduino is an open source electronic prototyping platform.Arduino board designs use a variety of microprocessors and controllers. The boards are equipped with sets of digital and analog input/output (I/O) pins that may be interfaced to various expansion boards ('shields') or breadboards (for prototyping) and other circuits. The boards feature serial communications interfaces, including Universal Serial Bus (USB) on some models, which are also used for loading programs. The microcontrollers can be programmed using the C and C++ programming languages, using a standard API which is also known as the Arduino language, inspired by the Processing language and used with a modified version of the Processing IDE.

LDR Sensor

A Light Dependent Resistor (LDR) is a passive electronic component whose resistance decreases with increasing incident light intensity. In complete darkness, its resistance can be as high as several megaohms. In bright light, it drops to a few hundred ohms. This variable resistance is read by the Arduino using a voltage divider circuit. The Arduino compares the LDR value against a configurable threshold to determine whether it's day or night, and controls the relay accordingly to switch the street light ON or OFF.