Wiring the SIM900A GSM/GPRS Development Board

Wired Developer

9 years ago

In this illustration we are going to wire the SIM900A an ultra-compact and reliable wireless module. The SIM900A is a complete Dual-Band GSM/GPRS module in a SMT type device. These SIM900A delivers GSM/GPRS 900/1800MHz performance for voice, SMS, data, and Fax in a small form factor and with low power consumption and perfect for your prototyping projects, like sending an SMS or Call if there is GAS leakage, Fire, Sending GPS coordinates. Below are the example how the SIM900A works, for this example we will going to send an SMS if the microcontroller detect a GAS leakage comes from the MQ GAS detection sensor.

Required Components

Arduino UNO/MEGA/PRO/NANO
SIM900A GSM/GPRS Module or Shield
MQ Sensors
Jumper Wires / DuPont Wires
Solder Less Bread Board

Software Required

Arduino IDE
CoolTerm or PuTTy

Sending Message AT Command via serial communication.

You can use Putty or CoolTerm serial communication software to send an instruction via serial communication port. If you don’t have this tools you can download it below.

Start AT Command

Select SMS Message Format

AT+CMGF = 1

Send SMS Message by placing your Phone number

AT+CMGS = \”0123456789”

> This is a test SMS from 14CORE

Another example how to send SMS via serial communication using function serial.println(); in Arduino.

Wiring Diagram