Presented By : Ankur KumarPresented By : Ankur Kumar

Introduction Aim Block Diagram Working Power Supply Section Microcontroller Section Microcontroller Unit Applications Conclusion

Generally, we use notice board for any information by using paper, marker etc in Institutes, collages, companies, offices.

This system is based on GSM modem. Colleges/Institutes can

display notice SMS on three LCDs using GSM modem .

Through Controller, anyone can display SMS at LCD notice board. It has three LCD based notice board. This system is controlled by microcontroller, using GSM modem.

The aim of the project is provide automatically SMS

based notice board. The motivation is to facilitate the users to display notice without using paper, white board etc. The system provides availability due to development of a low cost system.

The system is using SMS through mobile for displaying notice very easily.

Through SMS device, GSM modem and the

microcontroller, we are aiming for successful completion of this project.

SUPPLY SECTION

MICRO CONTROLLER 89C51/89s52

FIRST LCD Display

GSM MODEM

THIRD LCD Display

SECOND LCD Display

SOFTWARE REQUIREMENTS

• Batronix Program Studio for programming of Microcontroller• Orcad for Circuit Designing• Pads for PCB Designing

HARDWARE REQUIREMENTS

• Microcontroller 89c51/89s52• Crystal Oscillator• Resistor• Diode• Capacitor• Transistor• Connectors• Relay• GSM Modem• LCD display• Regulator

This is a SMS based system, one can display on three LCD display with the help of GSM modem. In this project firstly place the SIM card in GSM Modem, a SMS is made to the mobile which is communicating with the microcontroller serially, the microcontroller will receive the SMS automatically then the microcontroller display our SMS on three LCD’s.

The user types that SMS and send it, then GSM receive that SMS and sends it to microcontroller. After that, microcontroller can display it on LCD of notice board.

The outputs of an embedded system are: Display system SMS typing system

RLMT Connector:-- It is a connector used to connect the step down transformer to the bridge rectifier.

Bridge Rectifier:---- It is a full wave rectifier used to convert ac into dc , 9-15v ac made by transformer is converted into dc with the help of rectifier. Capacitors:Capacitor1:----- It is an electrolytic capacitor of rating 1000M/35V used to remove the ripples. Capacitor is the component used to pass the ac and block the dc. 

Capacitor 2:----- It is again an electrolytic capacitor 10M/65v used for filtering to give pure dc.Capacitor 3:----- It is an ceramic capacitor used to remove the spikes generated when frequency is high(spikes). Regulator:----- LM7805 is used to give a fixed 5v regulated supply. 

So the output of supply section is 5v regulated dc. 

+5v supply: This +5v supply is required for the controller to get start which is provided from the power supply section.

Crystal Oscillator: A crystal oscillator of 12 MHz is connected at pin no.19,x1 and pin no.18,x2 to generate the frequency for the controller. The crystal oscillator works on piezoelectric effect. The clock generated is used to determine the processing speed of the controller.

Two capacitors of 20 pf – 40 pf are also connected to stabilize the clock generated with one end to the oscillator while the other end is connected with the ground.

Reset section: It consists of an RC network consisting of 10M/35V capacitor and one resistance of 1k. This section is used to reset the controller connected at pin no.9 of AT89c51.

MICROCONTROLLER AT89C51/89s52 Features • Compatible with MCS-51™ Products• 8K Bytes of In-System Re-programmable Flash Memory• Endurance: 1,000 Write/Erase Cycles• Fully Static Operation: 0 Hz to 24 MHz• Three-level Program Memory Lock• 256 x 8-bit Internal RAM• 32 Programmable I/O Lines•Three 16-bit Timer/Counters• Eight Interrupt Sources• Programmable Serial Channel• Low-power Idle and Power-down Modes

Colleges notice board.  Institutes notice board.

  Companies notice board.  Offices notice board. 

  This “SMS based notice board” overcomes the

drawbacks of earlier notice board system. We are able to implement successfully our mission which is to develop a notice board system that enables us to provide the solution of the problems faced by wastage of paper, marker, etc.

The developing of this project has been a learning experience for all team members and would prove as a milestone in their academic career.

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