Gsm Based Notice Board

Topics: Microcontroller, Serial port, RS-232 Pages: 7 (1406 words) Published: March 2, 2013

Title: GSM Based Notice Board


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 in this 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. PROJECT CYCLE

1. Specification of the Project.
2. PCB Layout.
3. Device Test.
4. Code Implementation.
5. Program Test.
6. Pilot Run.
7. Documentation.

❖ Embedded C.
❖ Keil uVision
❖ ATMEL Programmer




Power supply:
The microcontroller and other devices get power supply from AC to Dc adapter through 7805, 5 volts regulator. The adapter output voltage will be 12V DC non regulated. The 7805/7812 voltage regulators are used to convert 12 V to 5V/12V DC.

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 to 5V/12V DC.

Micro controller - AT89C51
8051 based CMOS controller,
32 I/O Lines,
PCA, 3 Timers/Counters,
7 Interrupts/4 Priority Levels,
256 Bytes on-chip RAM,

Vital role of micro controller 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, Ie giving high means device will switch on and vice versa. Sometimes it may be interchange according to the transistor used to drive the device. Buzzer:

The buzzer subsystem produces a 2 KHz audible tone when powered. The buzzer will sound when the signal coming into the driver is high. It must be connected to a transistor, Darlington or transducer driver subsystem. The buzzer is connected between the supply rail (+ V) and the input...
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