12-11-2012, 02:20 PM
MINOR PROJECT ON DIGITAL SECURITY LOCK Abstract
DIGITAL SECURITY.docx (Size: 11.48 KB / Downloads: 31)
ABSTRACT
This project shows how we can interface a numeric keypad ,LCD display and a motor to microcontroller.The code is asked to beentered through keypad with a message on LCD “ENTER THEPASSWORD”.As the correct code is entered motor rotates.But on the entryof wrong password following message is displayed in LCD“WRONG PASSWORD”.In todays world security is main issue. This Project is used as a lock forsafe to protect the
confidentials and other expensive things.
The project isbuilt around 8051 microcontroller. Microcontroller continuously scans thekeypad . As a key is pressed controller detects it.First of all as we switch on the circuit a message is displayed on LCDconcerning to entering the password. Password is entered through anumeric keypoad which is attached to one of the port of microcontroller.As we enter the code , controller compares the entered passwordwith the correct password which is burned into it. If the password ismatched then stepper motor or simple motor which is attached to doorrotates and door will open.If the password is incorrect then door will notopen and “Wrong code” message is displayed on LCD.Numeric keypoad which is attached to one of the port of microcontroller. Keypad is a 4x3 keypad that is contains 4 rows and 3columns , containing keys from 0 to 9 and * ,# keys . Hence keypad willoccupy 7 I/O lines (4 orws+3 columns) of microcontroller,while 1 portcontains 8 I/O lines.