The document describes developing a mobile system to help students interact with their college. It uses DTMF signaling over GSM to allow students to access information about classrooms and campus locations by phone. The system includes a DTMF decoder, microcontroller, LED displays and large LCD screen. Students can dial a number and use their phone keypad to select options that will display directions or details on the LCD screen. The goal is to make the campus easier for new students to navigate without prior knowledge of its layout.

1. INTERACTING
COLLEGE
MOBILE SYSTEM

2. OBJECTIVE
 To develop a interacting college
mobile system.
 Make new students easy to identify
their class room.
 Any person entering the college
without having any knowledge
regarding branches, office room find
this project as the medium of

3. INTRODUCTION
 Interaction is based on GSM signals
of a mobile phone.
 DTMF signaling technique is utilised.
 A large LCD display is used for the
system.

5. DTMF SIGNALS
• Popular signaling method between
telephones and switching centers
• Also used for signaling between the
Telephone network and computer
networks
• Transmitted over a telephone line
• Uses speech frequency signals
• Superposition of 2 sine waves with
different frequencies

6. THE DTMF KEYPAD
1209 Hz 1336 Hz 1477 Hz
697 Hz 1 2 3
770 Hz 4 5 6
852 Hz 7 8 9
941 Hz * 0 #

7. DTMF GENERATION

8. Pin Diagram of AT89S52 Micro Controller

9.  MT8870 is used as DTMF decoder.
 LED’S are used for signaling
purpose.
 programming to the
microcontroller is done in
Embedded C language.
 Keil C software used for
interfacing the microcontroller.

11. WORKING MODEL RESULTS

12. Main
Displ
ay
JUST DIAL 9030000123 to
INTERACT

13. When
the
option
auditori
um is
selecte
d

14. When the option LIBRARY is selected.

15. Future Scope
Transport systems like
railways.
Multi-specialty hospitals.
Multiplex theaters.

16. CONCLUSION
 A well interacting college mobile system
have been developed.
 Reception counters at college campus can
be reduced.
 One or more people can also interact at the
same time.