It is a seminar presentation on GSM controlled wireless notice board, if facing any problem main me at rajneeshkumarsalgotra@gmail.com with subject GSM Wirelessnotice Board PPT _ Your Name

1. GSM Based Wireless Notice
Board
Presented By:
Sushant Khajuria
Rajneesh Kumar Salgotra
Kalyan Singh Rathore
under the guidance of
Assoc. prof. A.G.Mir

2. Content
• Block Diagram
• GSM Modem
• AT commands
• LED Display
• Circuit diagram of LED Display
• ATMEGA32
• Serial communication in ATMEGA32
• ULN2003A
• Circuit Diagram of Microcontroller
• Flow Chart
• Conclusion
• Suggestions

3. BLOCK DIAGRAM

4. GSM Modem
• GSM modem is the Data Communicating Equipment which
is connected to terminal equipment for data transmission and
reception.
• GSM stands for Global System for Mobile Communication
• SIM stands for Subscriber identity Module
• GSM modem is controlled using AT commands
• AT stands for Attention
• Ex- AT, AT+CMGR, AT+CMGS, AT+CMGD etc.

5. AT Commands & Corresponding Operation
AT Commands Description
AT To check if Modem is connected
properly
ATE0 To turn echo off
ATE1 To turn echo on
AT+CMGF Set operating Mode

6. AT Commands Description
AT+CMGD= <index>, <delflag> To delete a message
AT+CMGR= <index> To read message from an
index
AT+CMGS= “contact no.” , TP-
type address
To send message to specified
contact no.

7. AT+CMGS command
AT+CMGS = “+0123456789” , 145
> Welcome
Now Press Ctrl+Z
AT+CMGS = “+0123456789” , 145
> Welcome
Now Press Ctrl+Z

8. LED DOT MATRIX DISPLAY
5x7 Dot Matrix Display
• Column Cathode display
• Column Anode Display

9. LED Display
0 1 1 0 0
1
0
0
1
1
1
1

10. LED Display
0 1 1 0 0
1
0
1
1
1
1
1
0 1 1 0 0 0 1 0 0 0
1
0
0
1
1
1
1
1
0
0
1
1
1
1

11. LED Display Bits at columns
Bits
At
Rows

12. Shift Register
ST_CP SH_CP Input Serial Data

13. Circuit Diagram of LED Display

14. Interfacing
• Microcontroller is used to interface one device from
the other

15. Microcontroller ATmega32
Features:
• Advanced RISC Architecture
• High-performance, Low-power Atmel AVR 8-bit Microcontroller
• 32Kbytes of In-System Self-programmable Flash program memory
• 1024Bytes EEPROM
• 2Kbytes Internal SRAM
• Programmable Serial USART
• 32 Programmable I/O Lines
• Full Duplex Serial Line as controller have independent receiver and
transmitter registers.

16. Serial Communication in ATmega32
• ATmega32 is Full-Duplex in serial communication
• UBRR(USART Baud Rate Register)16 bit register is used for setting the
Baud rate
• Out of 16 bits only 12 bits are used for setting the baud rate
• Two shift registers- Transmit shift register and Receive shift register
are used for Full Duplex mode
• Each shift register has its buffer
• These buffers has same I/O address , which is called as UDR(USART
Data register)

17. Serial Communication in Atmega 32

18. ULN 2003A
• ULN2003 is a high voltage and current Darlington array IC
• It contains seven NPN Darlington pairs one for each input
• It is providing current amplification for LED display board
• Collector-Current rating of single darlington pair is 500mA

19. Circuit Diagram of Microcontroller

20. Flow Chart

21. Conclusion
• We can use this Project in college Notice Board, a Professor can send
message for the immediate gathering of students at department.
• It can be used on Highways for traffic control, like traffic on one side
of the road may be blocked in view of VVIP movement or jam ahead
• At Bus Stands, Railway Stations and Airports for the information
about the timing of the Buses , trains and airplanes
• It can be used for crime prevention

22. Suggestion
• The System may be used to authenticate the sender with contact no.
rather than authentication code, so more secure.
• Alarm can be embedded for indication of new message
• Display can be improved with larger size, more brightness