Microcontroller Based Reprogrammable Digital Door Lock Security System by Using Keypad & GSM/CDMA Technology

Abstract

Now a day's Security has been a prime concern in the home or office management. Digital door lock security system provides security and safety to house or office owners, belongings, assets from being damaged by external agent or undesired strangers. We have used a new technology, incoming number verification system which gives more protection for controlling & security system. As Conventional security system does not use any password, there is a chance to hack or break the system. In this regard we used a desire mobile number without verification which doesn't allow the door to be opend.This system is composed of the microcontroller based by using matrix keypad & GSM/CDMA network. The microcontroller based digital door lock security system is an access control system that allows only authorized persons to access restricted area. The password is stored in PROM so that we can change it any time. The system has a matrix keypad .When anyone enter the code in the matrix keypad, microcontroller verify the codes. If that code is correct the device will operate and the door will be open. But if someone enter wrong code a red signal will be shown which means that the entered code is wrong.GSM/CDMA module can be used to operate the device, when anyone make a call from his mobile the receiving device which is set in main circuitry will receive the call. If the call is from desired number then operate the device and the door will be unlocked. An IPS circuit can be used for giving backup in case of emergency when there is a power failure. Keywords: DTMF encoder and decoder, Global System for Mobile Communication, Micro-Controller, Mobile phone, and Matrix Keypad.