AT+CMGR - AT Command to Read SMS Message

Sometimes we have to read a particular message from preferred store using AT commands and SIM900-TTL GSM Modem. Here is the demonstration to list a particular message from SIM memory using AT commands. AT+CMGR is the command used to list particular message. GSM Modem I used is given here http://www.rhydolabz.com/index.php?main_page=product_info&cPath=184_185&products_id=1080


Step 1: Complete the circuit as shown in figure given below.

Step 2: Connect Arduino board to your computer.
Step 3: Open Arduino IDE.
Step 4: Now upload the below given program to Arduino board.

Some Important Facts :
1. For successfull uploading, wires connected to the RX and TX pins of Arduino board must be             disconnected before uploading the code.     
2. Don't forget to put a SIM having sufficient balance in the SIM900-TTL MODEM.
3. External power supply should be capable of handling 1A output current.

void setup() 

{

  Serial.begin(2400);

  Serial.write("AT+CMGF=1\r");           //set GSM to text mode

  delay(1500);

  Serial.write("AT+CPMS=\"SM\"\r");      //Preferred SMS Message Storage

  delay(1000);

    

  Serial.write("AT+CMGR=1\r");         //list the first message from SIM Memory

  while(1)

  {

    if(Serial.available())

    {

      Serial.write(Serial.read());  

    }   

  }

}

void loop() 

{

  

}

Step 4: Open your Serial Monitor. Change the baud rate to 2400.

Step 5: Press the Reset button on Arduino board.  Now that particular message in the SIM Memory will be displayed in the Serial Monitor (Encircled in black).