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The main objective of this project is to develop an embedded system, which is
used to verify and authenticate the authorized
This project is implemented Atmel based Atmel developed board interfaced with
I-Button, Keypad, buzzer and LCD.
The i-Button is a computer chip enclosed in a 16mm thick stainless steel can.
Because of this unique and durable container, up-to-date information can travel with a
person or object anywhere they go. The steel i-Button can be mounted virtually anywhere
because it is rugged enough to withstand harsh environments, indoors or outdoors. It is
small and portable enough to attach to a key fob, ring, watch, or other personal items, and
be used daily for applications such as access control to buildings and computers, asset
management and various data logging tasks.
Whenever the employee enters into the organization, he has to keep his Ibutton
to the reader which is attached to our microcontroller based embedded board. And
enters the password through the keypad interfaced. At that moment the reader will checks
weather the information of the employee is correct or not and then it will decide whether
to give access to that particular person or not. If the information of the employee is
correct then he will be permitted inside otherwise he will not permit inside and switches
on the buzzer. The information of the employee will be send to the microcontroller
through one wire protocol. And the information of the access system will be displayed on
the LCD which we embedded to our board.
This project uses regulated 5v, 750ma power supply. 7805 three terminal voltage
regulator is used for voltage regulation. Bridge type full wave rectifier is used to rectify
the ac output of secondary of 230/18v step down transformer.