Premnagar Dehradun Uttrakhand India

Interfacing of GMS modem (SIM900A) with ATmega Microcontrolles

Interfacing of GMS modem (SIM900A) with ATmega Microcontrolles

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GSM is used not only for communication but also for call management in telecommunication field. It is used as a wireless communication which is suitable for mobile communication, in DATA Card for wireless internet connection. GSM has different types of speed, which are divided as a 1G, 2G, 3G & 4G. A large amount of data can be transferred through the GSM due to its TDMA & FDMA access. GSM Technique is also used as a security system in any particular area which gives an alert sms when any unsecured event occurs (traffic security, alarm systems) also in indicators which gives an alarm, when any condition is matched.



GSM/GPRS MODEM TTL is built with dual band GSM/GPRS engine SIM900A, works on frequencies  900/ 1800 MHZ. It is suitable for SMS. Voice as well as DATA transfer application in Mobile2Mobile interface, Mobile2Device interface, Device2Mobile interface. The Baud rate is configurable from 9600-115200 through AT command .



  • Introduction to GSM
  • GSM working
  • Communication between GSM with PC using RS232
  • AT command testing with terminal or AT command tester.
  • Text message
    • Sending & Receiving message
    • Delete message
    • Clearing Inbox
    • Clearing all Message
  • Voice Call
    • Initiating outgoing call
    • For disconnecting the active call
    • For receiving incoming call
    • Redial last number
  • Baud rate setting
  • Selection of COM port
  • Setting up Data bits, parity & stop bit & handshaking method.
  • Getting log data in *.txt file


Interfacing of GSM modem with ATmega Microcontrollergsm (

  • Designing of AVR Atmega Board
  • Testing of AVR board with GSM modem
  • Sending of text message using AVR Board
  • Making a Voice call using AVR Board


Features of GSM modem:-

  • High Quality Product- SIM900A
  • Frequency – 900/1800 MHz.
  • Modem interface- RS232 Serial interface
  • Configurable baud rate
  • Wire antenna (SMA connector  with GSM antenna  optional) with SIM card holder
  • Built in network status LED
  • Inbuilt powerful TCP/IP Protocol stack internet data transfer over GPRS
  • Normal operation temperature : -20 C  to +55 C
  • Power Management  : 4.5V -12V DC


  • SMS based Remote Control & Alerts
  • Security Applications
  • Sensor Monitoring
  • GPRS Mode Remote Data Logging
  • GSM controlled devices



About SME:

SMEWe are providing training on PLC Automation, Robotics & Embedded System (Sensor & Wireless)  in Atmel AVR Series  (mega & Xmega) Microcontrollers, 8051, Arduino Boards & ARM Processor, Real time implementation with 100% live Hardware Exposure with process & architecture consulting, Designing & Training.

The main objective of training is to make the aspiring engineers acquainted with the conceptual as well as practical knowledge of the Industrial Automation & latest technologies being used to achieve industrial automation. The idea of organizing this  training is to inculcate the basic fundamentals of automation in the students and provide them with a platform to work on, In the near future.

Our Silent features:

  • We provide training & industrial projects based on PLC automation, Robotics, Embedded System, Wireless Embedded System, Sensor Embedded System using Atmel AVR Microcontrollers, ARM Processors & Arduino Boards.
  • We provide live projects to the B.Tech final year students on Embedded system, MATLAB, VLSI with *hardware exposure.
  • We provide solutions for final year projects and research projects to engineering students and hobbyists.
  • We at Schematics Micro Electronics provide best training in embedded system design and implementation.
  • We are the best training provider in the city with highly efficient facility at work.
  • To provide best Career Counselling to all our candidates and to ensure that every detail regarding the rewarding and adventurous careers is discussed.
  • We provide patents facilities to the innovative students for their innovative projects or ideas.
  • We provide Journals & Publication facilities to corporate, students for their best workout of projects.
  • We provide Corporate Training to corporate/ companies.
  • We arrange Workshops & Seminars based on latest industrial technology.


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