The circuit is developed using the Proteus Simulation software to demonstrate the operation.
In this article ATMEGA16 microcontroller is used. Based on these requirements, any microcontroller with 3 I/O ports and one UART peripheral is sufficient. The system contains a seven segment display array, a 4X4 matrix keypad and a GSM module to send the status message. The password is stored in the EEPROM of the microcontroller so that, power failure or reset of the system does not affect the password recognition. The password can be changed whenever required, but only after correctly entering the present password. The system alarms through a buzzer if a wrong password is entered for 3 times continuously and an SMS is sent to a predefined contact number. The system uses a seven segment display array to show the password, a matrix keypad to enter the numbers/password and operates a relay (to activate the solenoid valve) for locking and unlocking purpose. In this article, a digitally secured lock based on password verification is explained.
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