Motion Detection System using Arduino and PIR Sensor

A simple Embedded Systems project that detects motion using an Arduino Uno and a PIR (Passive Infrared) motion sensor. When motion is detected, an LED turns ON and the detection status is displayed on the Serial Monitor.

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Features

• Motion detection using a PIR sensor
• LED indication when motion is detected
• Real-time status displayed on the Serial Monitor
• Arduino programming using C/C++
• Simulated using Tinkercad Circuit

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Components Used

• Arduino Uno
• PIR Motion Sensor (HC-SR501)
• LED
• 220 Ω Resistor
• Breadboard
• Jumper Wires

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Circuit Diagram

Upload your circuit image as circuit.png and display it here:

![Circuit Diagram](circuit.png)

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Working Principle

1. The PIR sensor continuously monitors changes in infrared radiation.
2. When a person or object moves within its detection range, the sensor outputs a HIGH signal.
3. The Arduino reads this signal through a digital input pin.
4. If motion is detected:
   • The LED turns ON.
   • "Motion Detected!" is displayed on the Serial Monitor.
5. If no motion is detected:
   • The LED turns OFF.
   • "No Motion" is displayed on the Serial Monitor.

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Circuit Connections

Component	Arduino Pin
PIR OUT	D2
PIR VCC	5V
PIR GND	GND
LED	D12
LED GND	GND

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Software Used

• Arduino IDE
• Tinkercad Circuits

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Project Structure

Motion-Detection-System/
│
├── README.md
├── Motion_Detection_System.ino
├── circuit.png
└── output.png

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Output

Upload your Serial Monitor screenshot as output.png and display it here:

![Output](output.png)

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Applications

• Home security systems
• Intruder detection
• Automatic lighting systems
• Smart homes
• Office security
• Motion-activated devices

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Future Improvements

• Add an LCD/OLED display
• Include a buzzer alarm
• Send notifications using ESP32
• Capture images using a camera module
• Cloud-based monitoring

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Author

ASWIN S

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License

This project is licensed under the MIT License.