Project V - 8. Read SMS using SIM900A Based on Arduino

Read SMS using SIM900A

Arduino is used to process SMS data and display it on a 20x4 LCD connected to an I2C connection. The GSM module used is SIM900A.

Hardware Requirement

Arduino Uno Board
SIM900A GSM Module (you can also use Wavecom)
LCD 16*2 or 20*4 (with i2c connection is recomended)
Power supply +5 Volt
Jumper

SIM900A | Source

Block Diagram

Schematic

Arduino LCD 20x4

Learn more about I2C connections --> Project V - 14

Arduino - SIM900A

Source Code

#include <GPRS_Shield_Arduino.h>
#include <SoftwareSerial.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x3F, 20, 4);
#define PIN_TX 9
#define PIN_RX 8
#define BAUDRATE 9600

#define MESSAGE_LENGTH 160
char message[MESSAGE_LENGTH];
int messageIndex = 0;

char phone[16];
char datetime[24];

GPRS gprsTest(PIN_TX, PIN_RX, BAUDRATE); //RX,TX,PWR,BaudRate

void setup() {
lcd.begin();
delay(6000);
lcd.setCursor(0, 0);
lcd.print("Initialization.....");
while (!gprsTest.init()) {
delay(1000);
lcd.setCursor(0, 1);
lcd.print(" init error ");
}
lcd.setCursor(0, 1);
lcd.print(" Gprs init success");
delay(3000);
}

void loop() {
messageIndex = gprsTest.isSMSunread();
lcd.setCursor(0, 0);
lcd.print(" System is ready ");
lcd.setCursor(0, 1);
lcd.print(" Waiting a message");
if (messageIndex > 0) { //At least, there is one UNREAD SMS
gprsTest.readSMS(messageIndex, message, MESSAGE_LENGTH, phone, datetime);
//In order not to full SIM Memory, is better to delete it
gprsTest.deleteSMS(messageIndex);
lcd.setCursor(3, 2);
lcd.print(phone);
lcd.setCursor(2, 3);
lcd.print(message);
delay(5000);
lcd.clear();
}
}