07-03-2011, 10:12 AM
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Remote Notice Board using GSM with SMS
DESCRIPTION :
Now a days every advertisement is going to be digital. The big shops and shopping centers are using the digital moving displays now. In Railway station and bus stands everything that is ticket information, platform number etc is displaying in digital moving display. But in these displays if they wants to change the message or style they have to go there and connect the display to PC or laptop.
Suppose the same message if the person wants to display in main centers of the cities means he have to go there with laptop and change the message by connecting into PC. This project we can use mainly for police or army .I.e. displays will be connected to all the main centers in city if they wants to display messages about something crucial within 5 minute, they can’t. So keeping this in mind we are designing a new display system which can access remotely, we are using the GSM technology to access the display’s is one of the new technology in the embedded field to make the communication between microcontroller and mobile.
This project is a remote notice board with MODEM connected to it, so if the user wants to display some messages, he will send the messages in SMS format the MODEM in the display system will receive the message and update the display according to the message. For every message received from the user mobile, the system will check for the password and if the password is correct the controller will display the message. the LED s on the digital display board uses the latest hi-bread LCD modules (hi-bright), where LEDs are mounted on a rectangle plastic like enclosure and then wired as the 5x8 LED matrix with 5 column and 8 rows. These LED’s have more brightness compared to the other LED now available in the market.
TECHNOLOGY : GSM Technology
WORKING :
This is a very good project for college, police etc. This project has a moving message display, which can be used as the digital notice board, and also a GSM modem, which is the latest technology used for communication between the mobile and the embedded devices.
System will work like when the user wants to display or update the notice board, he have to send the message in his mobile defining the messages and then the password of the system to the number of the SIM which is inserted in the display system MODEM. Then the MODEM connected to the display system will receive the SMS, the microcontroller inside the system is programmed in such a way that when the modem receives any message the microcontroller will read the message form serial port and verify for the password, if the password is correct then it will start displaying the messages in the display system.
The messages are displayed on the system using high speed techniques, the entire display column is connected to shift register output so that the characters are first shifting to each column and then the microcontroller will switch on the row one by one with small delay. This process is continuing in high speed so that the viewer will feel the display in a more brightness.
EXAMPLE :
Shopping Malls, Bus Stands etc
OUR CHALLENGING WORK IN THIS PROJECT:
• Writing the Code for the Microcontroller using Embedded ‘C’ for 8051
• GSM
% OF SOFTWARE & HARDWARE :
• Embedded C – 40%
• Microcontroller Hardware – 60%
FUTURE ENHANCEMENT :
Now we are displaying the messages in scrolling mode only, in future we can add so many designs so that user can send style command with message he wants to display. We can add one more concept that user can sent 10 messages at a time with different styles.
MAIN COMPONENTS USED :
• 5 V DC Power Supply
• ATMEL AT89S52 Microcontroller
• RS 232 for Serial Communication – MAX 232
• External EEPROM Memory – AT24C02
• Buzzer – Frequency ( 1 to 18 KHz, 5V – 12V DC )
• Shift Register – 74HTC164
• GSM Transmitter & Receiver
• 5 x 8 LED Matrix Display
DESCRIPTION OF MAIN BLOCKS :
Micro Controller:
The AT89S52 is a low-power, high-performance CMOS 8-bit microcontroller with 8K bytes of in-system programmable Flash memory. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry- standard 80C51 instruction set and pin out.
Features
• 8K Bytes of In-System Programmable (ISP) Flash Memory
• Endurance: 1000 Write/Erase Cycles
• 4.0V to 5.5V Operating Range
• 256 x 8-bit Internal RAM
• 32 Programmable I/O Lines
• Full Duplex UART Serial Channel
• Fully Static Operation : 0 Hz to 33 MHz
Vital Role of Power Supply in ‘Remote Notice Board using GSM with SMS’
The adapter output voltage will be 12V DC non-regulated. The 7805/7812 voltage regulators are used to convert 12 V unregulated to regulated 5V/12V DC.
The microcontroller and other devices get power supply from AC to DC adapter through voltage regulator. The adapter output voltage will be 12V DC non-regulated. The 7805 voltage regulators are used to convert 12 V to 5VDC.
Vital Role of Micro Controller–AT89S52 in ‘Remote Notice Board using GSM with SMS’
The microcontroller inside the system is programmed in such a way that when the modem receives any message the microcontroller will read the message form serial port and verify for the password, if the pass word is correct then it will start displaying the messages in the display system.
The microcontroller is used to display the display system with LED connected as rows and columns using high speed scanning technique.
LCD is connected to microcontroller as 4 bit data mode, before displaying anything in LCD Initialization have to do, so microcontroller will control the LCD initialization and select the data register and command register according to the purpose.
Memory is connected to microcontroller using two pins, it is communicating with the microcontroller through I2C communication.
Buzzer is controlled by the microcontroller using single pins, i.e., giving high means device will switch on and vice versa. Sometimes it may be interchange according to the transistor used to drive the device.
Memory
These memory devices are used to store the data for off line process. The AT24C02A / 04A/ 08A/ 32/64 provides 2048/4096/8192/32,768/65,536 bits of serial electrically erasable and programmable read only memory (EEPROM) organized as 56/512/1024/4096/8192 words of 8 bits each. The device is optimized for use in many industrial and commercial applications where low power and low voltage operation are essential. The AT24C02A/04A/08A is available in space saving 8-pin PDIP.
Features
Internally Organized 256 x 8 (2K), 512 x 8 (4K) or 1024 x 8 (8K)
2-Wire Serial Interface (I2C protocol)
High Reliability
– Endurance: 1 Million Write Cycles
– Data Retention: 100 Years
– ESD Protection: >3000V
Vital role of External EEPROM memory in ‘Remote Notice Board using GSM with SMS’
EEPROM memory is electrically erasable programmable memory, it is communicating with the microcontroller using 12C communication i.e., it contains one data pin and clock pin, these device is connected as slave to the microcontroller. The main application of memory in this project is to store the message coming form user mobile, the microcontroller is doing the operation of writing and reading to memory.
RS 232 Protocol
RS-232 was created for one purpose, to interface between Data Terminal Equipment (DTE) and Data Communications Equipment (DCE) employing serial binary data interchange. So as stated the DTE is the terminal or computer and the DCE is the modem or other communications device.
RS-232 pin-outs for IBM compatible computers are shown below. There are two configurations that are typically used: one for a 9-pin connector and the other for a 25-pin connector.
