Theft Detection System (Using Arduino + PIR)

“Technology doesn’t sleep — that’s why it’s perfect for guarding what matters.”

💡 Introduction

introducing the concept of a Passive Infrared (PIR) sensor, how it detects motion, and how to interface it with an Arduino board to form the base of a theft detection system.

• PIR stands for Passive Infrared Sensor.
• It detects infrared (heat) radiation emitted by moving objects (like humans or animals).
• It has a range of 6 to 10 meters.
• Commonly used in security systems, automatic lights, and intruder alarms.

📘 Pre-requisite Knowledge

• Basic knowledge of Arduino board and its pins.
• Understanding of how to connect components like sensors and LEDs.
• Familiarity with the PIR (Passive Infrared) sensor and its function.
• Simple C++ coding or block based code for Arduino (e.g., pinMode(), digitalRead(), digitalWrite()).
• Use of if-else conditions in Arduino code.
• How to upload and run a sketch using Tinkercad simulator.

🎯 Learning Objectives

• Understand the working principle of a PIR (Passive Infrared) sensor.
• Connect a PIR sensor to an Arduino board correctly.
• Trigger an output device (like a buzzer or LED) on motion detection by writing code for Arduino.
• Simulate and test the theft detection system in Tinkercad.

🛠 Tools & Materials Required

•  Hardware: Laptop / Desktop, Arduino Uno, PIR Sensor, Buzzer, Wires.
• Software: Tinkercad.
• Others: Internet connection.

Activity - Theft Alarm

Step 1. Connect the circuit as given below.

PIR Sensor Pin	Connect To
VCC	3V on Arduino
GND	GND on Arduino
OUT	Analog Pin A0

 

Buzzer Pin	Connect To
Positive Terminal	D11 on Arduino
Negative Terminal	GND on Arduino

 

Step 2. Do the Following Code in Blocks or in C++.

OR

Step 3. Click on Start Simulation at top right side.

Activity: https://www.tinkercad.com/things/lLMeAMQdLtX-theft-alarm-system

🧩 Expected Outcome

🔍 Observation

• Connection of PIR Sensor to the Arduino board.
• Simulation of the project with PIR sensor.
• Connection of Piezo Buzzer to Arduino Board.
• Doing and understanding the Block Code.