SIM900A is a GSM module that function like phone. It can send a message, call a phone number and use GPRS to send data. Here’s the simple feature taken from it’s datasheet :

This code sets up communication between an Arduino and a GSM module (SIM900A) using SoftwareSerial. It allows the user to send an SMS or make a call by sending specific characters (‘s’ for SMS, ‘d’ for dialing) through the Arduino’s Serial Monitor.

Mar 12, 2023 · In this tutorial, we are going to learn how to interface the SIM900A module with Arduino and also build a call alert system. This circuit will call to a specified number if the button is pressed, so we can use any sensors/triggers instead of the button.

With a little help from a GSM module (like the kind in your cellphone), you can start sending messages and calling from your Arduino project. This article will show you how, step by step. Whether you’re making a smart mailbox, a home alarm system, or just want to learn something new, this guide has got you covered.

SIM900A Modem is built with Dual Band GSM/GPRS based SIM900A modem from SIMCOM. It works on frequencies 900/ 1800 MHz. SIM900A can search these two bands automatically. The frequency bands can also be set by AT Commands. The baud rate is configurable from 1200-115200 through AT command.

Oct 22, 2017 · This blog post provides a good starting point for beginners interested in using the SIM900A GSM module with an Arduino Uno. It clearly explains the basic communication method using AT commands and highlights the necessary components.

Feb 9, 2025 · GSM Sim900A with Arduino: Following are some of the projects which explain GSM Sim900A interfacing with Arduino and GSM Sim900A Arduino Code. Following are the detailed GSM Sim900A-based projects. Arduino Fire Alarm System with GSM Alert Text Message & Buzzer. Flood Monitoring System with SMS Alert using Arduino and GSM

Mar 13, 2024 · This Arduino code is designed to interface with a GSM module using AT commands for sending SMS messages, receiving live SMS, and making phone calls. The code uses the SoftwareSerial library to create a serial communication interface with the GSM module.

Mar 16, 2018 · The SIM900A is another module from SIMCOM popularly used as a GSM shield for sending and receiving SMS. I’ve already covered the SIM800L, now let’s look at the SIM900A breakout board.

Nov 8, 2020 · In this section, we will learn How to interface GSM module sim900 interfacing with arduino using softserial library, and code to control lights by sending sms to your sim module. SIM900A module work on AT commands.