Abstract:
A password protected, dynam
i
c LCD (Liquid
Crystal Display) m
e
ssaging board is
developed to use with ordinary telephone is
discussed in this publication. The device
should be connected in parallel to a fixed-
line telephone (called host telephone) and can be
operated via host telephone itself or any other fixed-line or m
obile telephone.
After authentication, user can feed a m
e
ssage
by using the built in standard m
e
ssage list or
by typing each character via telephone keypa
d. There are 9 standard m
e
ssages and a
standard m
e
ssage can be extended up to 250 ch
aracters and any of the ASCII characters can
be used but only capital English letters, 0 to
9 and space are allowed when user feeding his
own m
e
ssage through a telephone keypad.
