4. My project is a Scrolling (Moving) Message
Electronic Display Board which displays the
messages received as SMS or GPRS Packets.
Public can send flash information from
Mobiles or PCs to displays for instant viewing.
Displays are designed to quickly display large
amounts of information in the liquid crystal
display.
5. Based on the principle of serial communication in
collaboration with embedded systems.
This project is an implementation to the idea of
the wireless communication between a mobile
phone and a microcontroller.
It uses:
a) A moving message display, which will be used
as the digital notice board
b) A GSM modem, Motorola C168 , which is the
latest technology used for communication
between the mobile and the embedded devices.
c) Microcontroller, ATMEL AT89S52
6.
7. User wants to display a message
User sends the message in his mobile defining
the messages and then the password of the
system to the number of the subscriber
identity module (SIM) which is inserted in the
display system MODEM.
8. The GSM modem receives the SMS. The
AT commands are serially transferred to
the modem through MAX232.
The microcontroller will read the
message from serial headphone and
verify for the password, if the password
is correct then it will start displaying
the messages in the display system
9. 1. Programming of the mobile phone with AT
(Attention) command sequence
2. Interfacing the programming chip with the
personal computer
3. Interfacing the programmable chip with the
electronic board display
4. Interfacing of the mobile phone with the
programmable chip
5. Sending messages from the remote phone to
the electronic board
10. Banks
Effective traffic control
Advertisements
Education sector
Information exchange
Stock exchanges
12. GSM (Global System for Mobile communications:
originally from GROUPE Spécial Mobile) is the most
popular standard for mobile phones in the world.
GSM differs from its predecessors in that both
signaling and speech channels are digital, and thus is
considered a second generation (2G) mobile phone
system.
Most 2G GSM networks operate in the 900 MHz or
1800 MHz bands.
The modulation used in GSM is Gaussian minimum-
shift keying (GMSK), a kind of continuous-
phase frequency shift keying.
13. The SIM is a detachable smart card containing
the user's subscription information and
phone book.
It is an integrated circuit that securely stores
the International Mobile Subscriber Identity
(IMSI) and the related key used to identify and
authenticate subscriber on mobile telephony
devices.
14. The programmer used is a powerful programmer for
the Atmel 89 series of microcontrollers that includes
89C51/52/55, 89S51/52/55 and many more.
It will Program, Read and Verify Code Data, Write
Lock Bits, Erase and Blank Check. All fuse and lock
bits are programmable.
Major parts of this programmer are USB Port, Power
Supply and Firmware microcontroller.
Serial data is sent and received to this programmer
through the USB connector.
Programmer comes with window based software for
easy programming of the devices.
15. Tentative model to be
employed
Main Circuit Board
Technical Specifications
20. ADVANTAGES LIMITATIONS
This prototype has facilities
to be integrated with a
display board thus making
it truly mobile.
The SMS is deleted from the
phone each time it is read,
thus making room for the
next SMS.
The systems need not be
reprogrammed to display
new messages because it is
wireless.
Communications between
the subscriber and the base
station can be encrypted.
Currently the main work
that has been done on this
proposed system is through
serial port to the computer
but not wireless.
The major constraints
incorporated are the use of
‘*’ as the termination
character of the SMS and
the display of one SMS as at
a time.
These limitations can be
removed by the use of
higher end microcontrollers
and extended RAM.
