Group Members
Manik Singh
Malkeet Singh
Shivam Raina
Report on Arduino Password System: Door Lock with LCD and Buzzer
Circuit Diagram
Link - https://www.tinkercad.com/things/1J3EFGPaqoS-project-doorlock
1. Overview:
The provided Arduino code implements a basic password system using a 4x4 keypad and a
Liquid Crystal display. Users are prompted to enter a password, and upon correct entry, they are
greeted with a welcoming message. Incorrect attempts trigger an error message along with
visual and auditory cues.
2. Components:
Keypad: A 4x4 matrix keypad is utilized for entering the password.
Liquid Crystal Display: A 16x2 character LCD provides visual feedback and prompts.
LEDs: Two LEDs (red and green) indicate the status of the password entry.
Buzzer: An audible signal is produced using a buzzer.
3. Functionality:
Setup Function: Initializes serial communication, pin modes, LCD, and displays initial
messages.
Loop Function: Continuously scans for keypad input and processes entered keys.
Password Function: Checks the entered password against a predefined sequence. If the
password is correct, it returns 1; if incorrect, it returns 0. It also handles clearing the display and
resetting variables.
Enter Function: Displays "Enter Password" message.
Wrong Function: Displays "Wrong Password" message, activates red LED and buzzer for 3
seconds.
Correct Function: Displays "Correct Password" message, activates green LED, and displays a
welcoming message for a short duration.
4. Code Analysis:
The code is well-structured and commented, enhancing readability and understanding.
Modular functions are used for specific tasks, promoting code organization and reusability.
Proper delay intervals are employed to manage timing requirements.
Serial communication is enabled for debugging purposes.
The use of global variables could potentially lead to unintended side effects or conflicts, but in
this context, it seems manageable due to the simplicity of the program.
5. Recommendations for Improvement:
Consider enhancing security by implementing more robust password handling techniques such
as encryption.
Add a mechanism for password change/reset.
Implement a timeout feature to lock the system after a certain number of failed attempts.
Utilize arrays or constants for pin definitions to improve code maintainability.
Enhance user feedback by providing clearer messages and visual indicators.
6. Conclusion:
The provided Arduino password system demonstrates a fundamental implementation of a
security mechanism using a keypad and LCD. While functional, there is room for improvement
in terms of security, user experience, and code optimization. With further refinement, it could be
adapted for use in various access control applications.