Password Controlled Door Opener Using Servo Motor

Password Controlled Door Opener with Arduino

This report details the development of a password-controlled door opener system using an Arduino Uno microcontroller, a 4×4 keypad for password input, a 16×2 LCD for displaying messages, a servo motor for actuating the door mechanism, and a buzzer for audio feedback.

Components

• Arduino Uno microcontroller
• 4×4 Keypad
• 16×2 LCD display
• Breadboard
• Servo motor (e.g., SG90)
• Buzzer
• Jumper wires
• 5V DC power supply

System Functionality

1. User Input: The user enters a 6-digit password using the 4×4 keypad.
2. Password Check: The Arduino compares the entered password with a pre-defined password stored in its code.
3. Correct Password:

• The servo motor rotates to a designated angle, unlocking the door mechanism (e.g., turning a latch).
• A message confirming successful access appears on the LCD.
• The door remains open for 5 seconds.
• The servo motor then rotates back to its original position, re-locking the door.

4. Incorrect Password:

• An “Incorrect Password” message displays on the LCD.
• The buzzer sounds for 4 seconds to provide audio feedback.
• The system remains in standby mode, awaiting a new password attempt.

Hardware Connections

1. Connect the 4×4 keypad to the Arduino according to its pinout diagram.
2. Connect the LCD display to the Arduino using its I2C interface or digital pins.
3. Connect the servo motor’s control pin to a digital pin on the Arduino.
4. Connect the buzzer to a digital pin on the Arduino.
5. Ensure all components share a common ground connection.
6. Power the system using the 5V DC power supply.

Software Development

1. Include necessary libraries for keypad, LCD, and servo control in your Arduino code (e.g., Keypad.h, LiquidCrystal.h, Servo.h)
2. Define the correct password as a character array in your code.
3. In the setup() function, initialize the keypad, LCD, servo motor, and buzzer.
4. In the loop() function:

• Read the entered password from the keypad.
• Compare the entered password with the stored password.
• If passwords match:
• Control the servo motor to open the door.
• Display a success message on the LCD.
• Use a delay() function to keep the door open for 5 seconds.
• Control the servo motor to close the door.
• If passwords don’t match:
• Display an “Incorrect Password” message on the LCD.
• Activate the buzzer for 4 seconds.

Report Conclusion

This project demonstrates a basic password-controlled door opener system using readily available components. The system offers a simple and secure solution for access control applications.

Further Enhancements

• Implement a mechanism for password reset in case it’s forgotten.
• Integrate a real-time clock module to allow for time-based access control.
• Utilize an RFID module for contactless password entry.
• Employ a more robust door locking mechanism for increased security.

Safety Considerations

• Ensure the chosen servo motor has sufficient torque to handle the door mechanism’s weight and friction.
• Design the door opening mechanism to prevent injuries during operation.