smart-room-fan-automation

An Arduino-based smart system that automatically controls a fan based on room occupancy and temperature.

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🚀 Features

• 👥 Detects number of people using IR sensors
• 🌡️ Monitors temperature using DHT11
• 🌀 Automatically controls fan speed (PWM)
• ⚡ Turns OFF fan when room is empty
• 📟 Displays real-time data on LCD

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🛠️ Technologies Used

• Arduino (C/C++)
• Embedded Systems
• Sensors (IR, DHT11)
• I2C Communication
• PWM (Fan Control)

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🔌 Components

• Arduino Uno
• DHT11 Temperature Sensor
• 2x IR Sensors
• 16x2 I2C LCD Display
• DC Fan
• Transistor (TIP122 or MOSFET)
• Diode
• Resistors
• Jumper Wires

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⚙️ How It Works

1. IR sensors detect entry and exit of people.
2. People counter is updated based on IR sensors.
3. DHT11 reads the current temperature.
4. Fan control:
   • Turns OFF if no people are present.
   • Turns ON if people are present.
   • Speed adjusts based on temperature:
     • 25–26°C → Low
     • 26–27°C → Medium
     • 27–28°C → High
     • ≥28°C → Maximum
5. LCD Display:
   • Shows Temperature
   • Shows People count

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Project Demo