For our project of connecting a gsm modem or module to Arduino and hence sending and receiving SMS using Arduino – it’s always good to choose an Arduino compatible GSM Module – that is a GSM module with TTL Output provisions. ![]() Lots of varieties of GSM modems and GSM Modules are available in the market to choose from. These types of provisions vary with different modules. The board will also have pins or provisions to attach the mic and speaker, to take out +5V or other values of power and ground connections. So let’s get to business!Ī GSM Module is basically a GSM Modem (like SIM 900) connected to a PCB with different types of output taken from the board – say TTL Output (for Arduino, 8051 and other microcontrollers) and RS232 Output to interface directly with a PC (personal computer). You only need to make 3 connections between the gsm module and Arduino. ![]() Interfacing a GSM module to Arduino is pretty simple. We are using the most popular module based on Simcom SIM900 and Arduino Uno for this tutorial. There are different kinds of GSM modules available on the market. ![]() In this article, we are going to see how to interface the GSM Module with Arduino.
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