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🔒 Smart Intrusion Detection System – Arduino Project (PIR + Ultrasonic + DHT11)

This project demonstrates a smart intrusion detection system that uses a PIR sensor, ultrasonic distance sensor, and a DHT11 temperature sensor to detect different objects under varying temperature conditions.

🎯 Objective:
To evaluate how accurately ultrasonic and PIR sensors detect different objects (plastic, sponge, steel, hot water, and a human hand) at specific distances and temperatures.

📋 How it works:

PIR Sensor detects infrared radiation (heat).

Ultrasonic Sensor detects object movement based on distance.

DHT11 measures ambient temperature.

Red LED lights up when infrared is detected.

Blue LED lights up when movement is detected.

Buzzer sounds when both movement and heat are detected (indicating a likely intrusion).

🧪 Tested Objects:

Human hand

Hot water bottle

Plastic

Sponge

Steel

📊 Results:
Triggering distances are recorded for each sensor and object combination across different temperature ranges.

📦 Components Used:

Arduino

DHT11 Temperature Sensor

HC-SR04 Ultrasonic Sensor

PIR Sensor

LEDs (Red & Blue)

Buzzer

Jumper wires

Breadboard

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#Arduino #PIRsensor #UltrasonicSensor #DHT11 #IntrusionDetection #STEM #ElectronicsProject #SmartSecurity #EngineeringStudent