PLC BASED DOOR OPEN AND CLOSE SYSTEM

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WORKING PRINICIPLE:
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 PLC. 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 Stepper motor rotate forward side so that the door is opened. If we entered a wrong password for more than three times then the Alarm is switched on



HARDWARE REQUIREMENTS:

• AT89C51 MICROCONTROLLER
• LCD
• STEPPER MOTOR
• KEYPAD
• ULN2003 MOTOR DRIVER
• SENSOR
• BUZZER