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What is Microcontroller Digital Code Lock System about?

The document describes a microcontroller-based digital code lock system. The system uses an AT89C2051 microcontroller with 2KB of flash memory to store and check an entered password against a stored password. When the correct password is entered via a keypad, a relay is activated to open the door. If an incorrect password is entered more than three times, an alarm is activated. The microcontroller can also automatically open the door upon sensing the person

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