Prepared By:

Group No : 8(Raju Yadav, Prashant Mishra, Rahul kumar ,Satendra Kumar)

Ec (4-year)

PRESENTATION ON

Content Objective Circuit Principle Circuit Diagram Circuit Components Circuit Design Testing Advantages Applications Circuit Limitations

Objective• The importance of notice boards in

public places like railway stations, bus stations and airports. But changing notices day-to-day is a difficult task .

• So Explain how to design a wireless electronic notice board  using GSM technology.

• The project displays the data on LCD whatever we sent from the mobile.

Circuit Principle

When we send the message from the mobile, GSM modem which is arranged at the display unit receives the message. Now the controller reads the message from the GSM modem and displays in on LCD.

Circuit Diagram

Circuit Components• Atmega 328 controller • 16*2 LCD • GSM sim 900 module • 12V,1A adaptor -2• 5V power supply circuit • Variable Resistor 10k• 0.1uF ceramic capacitors – 2• 22 pF ceramic capacitors – 2 • 10uF electrolytic capacitor • 12MHz crystal • 220,330 Resistor

Atmega 328 controller

• The Atmega328 is a very popular microcontroller chip produced by Atmel. It is an 8-bit microcontroller that has32K of flash memory, 1K of EEPROM, and 2K of internal SRAM.

• The Atmega328 has 28 pins. It has 14 digital I/O pins, of which 6 can be used as PWM outputs and 6 analog input pins.

• The Atmega328 is a low-power chip, so it only needs between 1.8-5.5V of power to operate. The Atmega328 chip has an analog-to-digital converter (ADC) inside of it.

LCD( Liquid Crystal Display)

• A liquid crystal display (LCD) is a thin, flat display device made up of any number of color or monochrome pixels arrayed in front of a light source or reflector.

• If a 4-bit data bus is used the LCD will require 7 data lines (3 control lines plus the 4 lines for the data bus).

• If an 8-bit data bus is used the LCD will require 11 data

lines (3 control lines plus the 8 lines for the data bus).

GSM ModemA GSM modem is a wireless modem that works with a GSM wireless network.

A wireless modem behaves like a dial-up modem.GSM modem requires a SIM card from a wireless carrier in order to operate

dial-up modem sends and receives data through a fixed telephone line while a wireless modem sends and receives data through radio waves.

A GSM modem is a wireless modem that works with a GSM wireless network.

Circuit DesignThe above circuit consists of 328 controller, GSM module, and 16*2 LCD. LCD is connected to P1.0 and it is used to display message. GSM module is connected to controller through the max232 IC. Here it is used for level conversion.Here LCD is used in 4 bit mode. Means only 4 data lines are required to display the data. These data lines are connected to P1.4, P1.5, P1.6 and P1.7 and control pins RS, RW, EN pins are connected to P1.0, P1.1 and P1.2 respectively.

Advantages• No need of any complex wires to display

the message on LCD as it is wireless. • Consumes less power and easy to operate. • The circuit is portable.

Applications

•Used in bus stations, railway stations, parks, etc. to display the messages wirelessly •This Project is used in colleges and organizations. •Used in bus stations, railway stations, parks, etc. to display the messages wirelessly •This Project is used in colleges and organizations. •Used in bus stations, railway stations, parks, etc. to display the messages wirelessly

• Used in bus stations, railway stations, parks, etc. to display the messages wirelessly.

• This Project is used in colleges an organizations.

Circuit Limitations• Display unit must have the network to receive the

wirelessly.

• there is password any one can not send the message to display.

• Only accept massage come with pass code. *1234,------massage-----#

ReferencesReferences• http://en.wikipedia.org/wiki/Wikipedia • http://www.atmel.com/ • http://images.google.com • http://www.8052.com • http://www.datasheetcatalog.com • http://www.keil.com/forum/docs

Any Queries?