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Abstract: Now a days 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. 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 doesnt allow the door to be opend. 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.
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When this command asserts in the 48lf4m16a2 cycle, device state is clock suspend mode. Reviews No reviews for 48lc4m16a2 datasheet. View PDF for Mobile.
Separated power datasjeet V immunity. In this regard we used a desire mobile number without verification which doesnt allow the door to be opend.
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. 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. Introduction Tones generated from DTMF keypad can identify what unit we want to control, as well as which unique function we want to perform.
DTMF encoder technologies does not require any radiation or any laser beam, not harmful, no limitation of range. It can be used from any distance using a simple telephone line or mobile phone.
The UMB is a single chip, silicon gate. It provides dialing pulse DP.
IC UMB is consists of telephone set which is present in the remote place Be your workspace signal are sent through this telephone or mobile. These two tones are taken from row frequency and column frequency. MT operating function include a band split filter that separates the high and low tones of the received pair, and a digital decoder that verifies both the frequency and duration of the received tones before passing the resulting 4-bit code to the output bus.
Shows the block diagram of the system. In the above fig1. A digital encoder is a device that converts tone signal into a sequence of digital pulse.
By counting a single bit or by decoding a set of bits, the pulse can be converted to relative or absolute pulse can be converted to relative or absolute position measurement.
DTMF decoder detects the dial tone from a cell phone and decodes the keypad pressed on the remote cell phone. Microcontroller units are used for special or fixed type operation.
Microcontrollers are used in automatically controlled products and devices, such as remote control, appliances etc. Relay interfacing unit interface between the loads and controlling circuit.
A relay is a protective device driven from controlling circuit directly. Microcontroller verifies the codes. Encoder is a device that converts tone signal into sequence of digital pulse. Decoder detects the dial tone from a telephone line and decodes the keypad pressed on the remote telephone.
Fig 2. Is the circuit diagram of digital door lock security system and Fig 3. Shows practical implementation.
Circuit diagram of Digital Door lock security system. Fig 3.
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