Abstract :

This GSM Modem can accept any GSM network operator SIM card and act just like a mobile phone with its own unique phone number. Advantage of using this modem will be that you can use its RS232 port to communicate and develop embedded applications. Applications like SMS Control, data transfer, remote control and logging can be developed easily. The modem can either be connected to PC serial port directly or to any microcontroller. It can be used to send and receive SMS or make/receive voice calls. It can also be used in GPRS mode to connect to internet and do many applications for data logging and control. In GPRS mode you can also connect to any remote FTP server and upload files for data logging.

                     This GSM modem is a highly flexible plug and play quad band SIM300 GSM modem for direct and easy integration to RS232 applications. Supports features like Voice, SMS, Data/Fax, GPRS and integrated TCP/IP stack.

            With help of this project we can send the message easily using PC keyboard through GSM modem. This gives flexibility to fingers and also can improve typing skills instead of sending SMS through mobile phone. The mobile phone keypad won’t be flexible for all people. That’s the reason why we have implemented this project.

                        This project consists of microcontroller, GSM modem and a PC. In this project, we design front-end software in PC which contains field with text box. Whatever the text message we are entering through keyboard in text box window will automatically send to the recipient mobile number through the GSM modem.  

                     Here we use 8051 as a microcontroller with 5v DC Power supply. Serial (UART) protocol is primary concern here. The main heart of this project is GSM/GPRS modem and it work on GPRS AT commands. RF receiver connected to microcontroller through I/O lines.

TECHNICAL SPECIFICATIONS:

HARDWARE SPECIFICATIONS

Micro controller         :           AT89S52

Crystal                        :           11.0592 MHz

LED                            :           5mm Red LED

GSM modem              :           SIM 300

POWER SUPPLY

Transformer                :           12V step down 

Filter                           :           1000uf/25V

Voltage Regulator      :           7805 / 7812

SOFTWARE SPECIFICATIONS

Software tools used

Keil IDE

Proteus VSM

UC flash

APPLICATIONS

• In Industries
• In Institutions