🚶 Motion Sensored Light System Using Arduino

📌 Overview

This project implements a motion-activated lighting system using Arduino and a PIR (Passive Infrared) sensor. The system automatically turns on a light when motion is detected and turns it off after a predefined delay if no motion is detected, promoting energy-efficient and automated lighting for rooms, corridors, or outdoor spaces.

This project is beginner-friendly and it is the which got me into learning embedded systems, sensor interfacing, and automation using Arduino.

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⚙️ Components Used

• Arduino UNO
• PIR Motion Sensor (HC-SR501)
• Relay Module (to control AC light)
• Jumper Wires
• Breadboard
• USB B Cable for Arduino

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🛠️ Working Principle

• The PIR sensor detects infrared signals from moving objects (like humans).
• When motion is detected, the PIR sensor outputs a HIGH signal to the Arduino.
• Arduino triggers a relay module to turn ON the connected light.
• After a preset delay (e.g., 30 seconds) without further motion, Arduino turns OFF the light automatically.
• Delay timing can be adjusted in the Arduino code (delay_time variable).

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🔌 Circuit Connections

PIR Sensor	Arduino
VCC	5V
GND	GND
OUT	D2

Relay Module	Arduino
VCC	5V
GND	GND
IN	D8

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Block Diagram

flowchart LR
    PIR[PIR Motion Sensor] --> Arduino[Arduino UNO]
    Arduino --> Relay[Relay Module]
    Relay --> Load["12V DC Load (Light, Buzzer, Fan)"]

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