modulearduinogsm

SMS can't be sent using GSM module SIM900A

I am trying to send a SMS using GSM SIM900A. But there is no compilation error and other interference there.

The code is executed properly but SMS isn't sent to the number mentioned in the code.

#include <TinyGPS.h>
#include <SoftwareSerial.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);
SoftwareSerial SIM900A(7, 8);

void setup() {

  Serial.begin(9600);
  SIM900A.begin(9600);
  pinMode(6, INPUT);
}

void loop() {

  bool state = digitalRead(6);
  if (state == HIGH) {

    SIM900A.println("AT+CMGF=1");
    delay(1000);
    SIM900A.println("AT+CMGS=\"+8801679388394\"\r");
    delay(1000);
    
    SIM900A.println("Alert I need help....Asheesh ,Battalion No. 1233456 ");
    SIM900A.println((char)26);
    
    delay(10000);

  }
  else {
    delay(2000);
  }
}

What's wrong here?

Solution

  • GSM SIM900A only supports 2G SIM card.At first make sure that you are using a 2G SIM.