automatic college bell using pic micro controller

Now a days there is use of
automation in every sector. Here we
are presenting a new model. This
model of ringing bell is used
everywhere from schools to colleges.
It avoid the human help with
accuracy as it is automatic. It uses
Real Time Clock(DS1307) which track
the real time . The microcontroller
P89V51RD2 is used to control all the
functions through program. When
this programmed time equals the
real time then the bell is switched
ON via Relay for predetermined time
at normal class timings as well as
exam times.
Also we are using “GSM based
LED Scrolling display Board” for
displaying notices/messages at the
places which require the real time,
by sending SMS containing message
through mobile. The SMS is deleted
from the SIM each time it is read,
thus making room for the next SMS.