Microchip Technology

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  • Password Based Door Lock System

  • Created: Sep 19, 2014

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This project is designed to eliminate the security risk of carrying and losing the key of a home, office or commercial establishment using MICROCHIP SST89E516RD-40-C-PIE microcontroller. It also eliminates the need to store spare keys somewhere on your property. The main idea of proposing a digital locking system is to provide modern security feature than the traditional mechanical lock. The keypad will be used to enter the password and if the password matches to the password that was already stored in flash of the microcontroller, the dc motor will activate and the door will open. If it does not matched, then the door will remain closed, denying the access to the person.

The main component in the circuit is Microchip Technology's SST89E516RD-40-C-PIE. Once the circuit is powered, microcontroller sends commands to the LCD to display "enter password" on LCD. Now we need to enter the password using the keypad. Once the password is entered, it displays 5 stars on LCD to indicate that controller read password successfully. Now the controller compares the entered password with predefined password. If the password matched, then controller makes P3.0 high. So the base of the transistor gets sufficient current to drive the relay, as a result door motor rotates to open the door. If the password did not matched then microcontroller makes P3.0 low, hence door motor is at stationary so that door remains close.

Password Based Door lock system has the primary objective of reducing the security risks associated with the use of traditional mechanical locks. This simple circuit can be used at residential places to ensure better safety. It can also be used at organizations to ensure authorized access to highly secured places.



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