No output received (neither expected nor unexpected)

Other Hardware Home Automation
1

I am trying to run a simple program using Arduino UNO and SIM900A GSM module, which will receive a digit in text message and if the comparison is valid then the pin no. 12 should be high (Led connected on the PIN).

Issue: i see the GSM module getting initialized for receiving, i even see the messages i sent on the serial monitor, but the data sent seems to be unprocessed since there is no change in any pins values, nor anything is printed on the serial monitor.

#include <SoftwareSerial.h>
//use TX to 9 and RX to 10
SoftwareSerial mySerial(9, 10);
  int ledRED = 12;

void setup()
{
  mySerial.begin(9600);   // Setting the baud rate of GSM Module  
  Serial.begin(9600);    // Setting the baud rate of Serial Monitor (Arduino)
  delay(100);
  pinMode(ledRED,OUTPUT);
  ReceiveMessage();
}


void loop()
{
 if (mySerial.available()>0)
   Serial.write(mySerial.read());
  storeData();
   
}

 void ReceiveMessage()
{
  mySerial.println("AT+CNMI=2,2,0,0,0"); // AT Command to receive a live SMS
  delay(1000);
  mySerial.println("GSM SUCCESSFULLY CONFIGURED FOR RECEIVING");
 }
 
 void storeData() 
  {
        while (Serial.available())
     {
         int inNo = Serial.read();
         
        if(inNo=='3')
       {  
         digitalWrite(ledRED,1);    // making Pin 12 high if data received is 'C'
         mySerial.println("RED ON"); // printing the same on the Serial monitor

      }

    }
 }

Can anyone please look at the code and determine what is wrong here and help me fix it.

Thanx in Advance.

2

Is your GSM modem connected to the software serial (pins 9 & 10) or the hardware serial port?

3

Please always do a Tools > Auto Format on your code before posting it. This will make it easier for you to spot bugs and make it easier for us to read.

4

rw950431:
Is your GSM modem connected to the software serial (pins 9 & 10) or the hardware serial port?

yes

5

Yes to which?

It seems to me your program is confused about which serial port is talking to the GSM module and which one is for human-readable status updates.

For example is Recievemsg you send what appears to be configuration commands to a GSM module on mySerial (the software serial port) but then send a status msg intended for humans to the same port.

void ReceiveMessage()
{
  mySerial.println("AT+CNMI=2,2,0,0,0"); // AT Command to receive a live SMS
  delay(1000);
  mySerial.println("GSM SUCCESSFULLY CONFIGURED FOR RECEIVING");
 }

Whereas in Storedata you read the characters coming in on Serial (the hardware serial port) looking for a '3' (presumably as part of a text message) without having configured a GSM modem on that port.