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The task of ringing bell automatically is
carried out by this project. It has an inbuilt
Real Time Clock which shows the real time.
When this real time equals to the bell
ringing time then bell is switched ON
following relay. The time is display on LED
Scrolling Display Board. Using this project
we implementation the idea of wireless
communicaion between mobile phone and
display board. This project include the
following main components.
 Microcontroller-Philips P89V51RD2
 GSM modem-SIM 300
 Real Time Clock
 MAX 232 level converter
 7*48 LED display
 Shift Register 74HC595