Password Based Door Locking

Security is a prime concern in our day-to-day life. Everyone wants to be as much secure as possible. An access control for doors forms a vital link in a security chain. The microcontroller based Door locker is an access control system that allows only authorized persons to access a restricted area. The system is fully controlled by the 8-bit microcontroller AT89C2051 which has 2 Kbytes of ROM for the program memory. The password is stored in the EPROM so that we can change it at any time. The system has a Keypad by which the password can be entered through it. When the entered password equals with the password stored in the memory then the relay gets on and so that the door is opened. If we entered a wrong password for more than three times

The microcontroller-based door locker system utilizes the AT89C2051, an 8-bit microcontroller featuring 2 Kbytes of ROM, which is essential for storing the operational program. The system is designed to enhance security through a password-protected access control mechanism, ensuring that only authorized individuals can gain entry to restricted areas.

The core of the system is the keypad interface, which allows users to input a predetermined password. This keypad typically consists of a 4x4 matrix layout, enabling efficient entry of numeric passwords. The microcontroller continuously monitors the keypad input. When a user enters a password, the system compares the input against the password stored in the EPROM. If the entered password matches the stored password, the microcontroller activates a relay, which controls the door locking mechanism, allowing the door to be opened.

For added security, the system incorporates a counter that tracks the number of incorrect password attempts. If a user fails to enter the correct password after three attempts, the system can be programmed to trigger an alarm or lock the keypad for a specific duration, thereby deterring unauthorized access attempts.

The circuit typically includes additional components such as a power supply unit to provide the necessary voltage and current to the microcontroller and other peripherals, as well as an LED indicator to provide visual feedback regarding the system's status (e.g., door locked or unlocked). The relay used in the circuit should be rated appropriately to handle the current required to operate the door locking mechanism, ensuring reliable operation.

Overall, the microcontroller-based door locker system presents a robust solution for access control, integrating user-friendly features with essential security measures to safeguard restricted areas effectively.Security is a prime concern in our day-today life. Everyone wants to be as much secure as possible. An access control for doors forms a vital link in a security chain. The microcontroller based Door locker is an access control system that allows only authorized persons to access a restricted area. The system is fully controlled by the 8 bit microcontroller AT89C2051 which has a 2Kbytes of ROM for the program memory.

The password is stored in the EPROM so that we can change it at any time. The system has a Keypad by which the password can be entered through it. When the entered password equals with the password stored in the memory then the relay gets on and so that the door is opened. If we entered a wrong password for more than three time 🔗 External reference