An Arduino-based automatic door control system that combines a servo motor for locking/unlocking and a DC motor for opening/closing the door. Features motion detection and manual controls for a complete smart door solution.

This project implements an intelligent door automation system using Arduino Uno. The system automatically detects motion, unlocks the door, opens it, keeps it open for a preset time, and then closes and locks it again. Perfect for home automation, smart offices, or accessible entrance systems.

• Automatic Motion Detection - PIR sensor triggers door opening when someone approaches
• Servo-Controlled Lock - Smooth locking and unlocking mechanism
• DC Motor Door Control - Powerful motor opens and closes the door
• Manual Override - Physical buttons for manual operation
• State Machine Logic - Smooth transitions between door states
• Status LED Indicator - Visual feedback for door status
• Configurable Timings - Easy to adjust open/close/wait times
• Serial Monitoring - Real-time status updates via Serial Monitor

• Arduino Uno (or compatible board)
• Servo Motor (SG90 or similar)
• DC Motor with gearbox (12V recommended)
• L298N Motor Driver Module
• PIR Motion Sensor (HC-SR501)
• 2x Push Buttons
• LED (optional, can use built-in LED)
• Jumper Wires
• Breadboard
• 12V Power Supply for DC motor
• 5V Power Supply for Arduino (USB or adapter)

• Limit switches for accurate door position detection
• Ultrasonic sensor as alternative to PIR
• LCD display for status messages
• Buzzer for audio feedback

• OUT1 & OUT2: Connect to DC motor terminals
• 12V & GND: Connect to 12V power supply
• 5V: Can power Arduino if jumper is set (optional)

git clone https://github.com/yourusername/automatic-door-lock-system.git
cd automatic-door-lock-system

Download and install from Arduino Official Website

• Servo Library - Usually pre-installed with Arduino IDE
• No external libraries required!

1. Open automatic_door_lock.ino in Arduino IDE
2. Select Tools → Board → Arduino Uno
3. Select correct Port
4. Click Upload button

1. Power On: System starts with door LOCKED and CLOSED
2. Motion Detection: Walk in front of PIR sensor
3. Auto Open: Door unlocks and opens automatically
4. Wait Time: Door stays open for 5 seconds (configurable)
5. Auto Close: Door closes and locks automatically

• Open Button: Force door to unlock and open
• Close Button: Force door to close immediately
• LED Indicator:
  • OFF = Door closed and locked
  • ON = Door open or opening

Open Serial Monitor (115200 baud) to see real-time status:

Automatic Door System Initialized
Door is LOCKED and CLOSED
Motion detected! Unlocking door...
Lock: UNLOCKED
Door unlocked. Opening...
Motor: OPENING
Door is OPEN
Closing door...
Motor: CLOSING
Motor: STOPPED
Door closed. Locking...
Lock: LOCKED
Door is LOCKED and CLOSED

Adjust these constants in the code to customize behavior:

#define SERVO_LOCK_POS 0     // Locked angle (0-180)
#define SERVO_UNLOCK_POS 90  // Unlocked angle (0-180)
#define MOTOR_SPEED 200      // Motor speed (0-255)
#define DOOR_OPEN_TIME 3000  // Time to fully open (ms)
#define DOOR_CLOSE_TIME 3000 // Time to fully close (ms)
#define DOOR_WAIT_TIME 5000  // How long door stays open (ms)

• Check DC motor connections to L298N
• Verify 12V power supply is connected
• Increase MOTOR_SPEED value
• Check motor direction (swap IN1 and IN2 if needed)

• Ensure servo is powered (5V and GND)
• Check signal wire connection to pin 9
• Test servo separately with sweep example

• Wait 30-60 seconds after power on (calibration time)
• Adjust sensitivity potentiometer on PIR
• Check 5V and GND connections

• Check mechanical coupling between motor and door
• Increase motor speed or use geared motor
• Ensure motor has sufficient torque

• Add RFID/Keypad for access control
• Implement limit switches for precise positioning
• Add ultrasonic sensor for obstacle detection
• Integrate with home automation (WiFi/Bluetooth)
• Add emergency override mechanism
• Install magnetic lock for additional security
• Connect to smartphone app for remote control

LOCKED_CLOSED → UNLOCKING → OPENING → OPEN → CLOSING → LOCKING → LOCKED_CLOSED
      ↑                                                                   ↓
      └───────────────────────────────────────────────────────────────────┘

Contributions are welcome! Please feel free to submit a Pull Request. For major changes:

1. Fork the repository
2. Create your feature branch (git checkout -b feature/AmazingFeature)
3. Commit your changes (git commit -m 'Add some AmazingFeature')
4. Push to the branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

This project is licensed under the MIT License - see the LICENSE file for details.

• Power Safety: Use appropriate power supplies and avoid shorts
• Mechanical Safety: Ensure door mechanism cannot trap or injure users
• Testing: Test thoroughly before deploying in public areas
• Emergency Stop: Implement emergency stop mechanism for safety
• Supervision: Don't leave system unattended during initial testing

Your Name - @itsom134

• Arduino Community for excellent documentation
• All contributors who help improve this project
• Open source hardware community

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