This is a example program to send and receive sms using gsm module and arduino. I tested these code with the SIM900A gsm module.
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/*
Press--> t: To Send Text Message.
r: To Receive Text Message.
*/
#include <SoftwareSerial.h>
SoftwareSerial mySerial(7, 8);
void setup()
{
mySerial.begin(9600); // the GPRS baud rate
Serial.begin(9600); // the GPRS baud rate
delay(500);
}
void loop()
{
if (Serial.available()>0)
switch(Serial.read())
{
case 't':
SendTextMessage();
break;
case 'r':
RecieveTextMessage();
break;
}
if (mySerial.available()>0)
Serial.write(mySerial.read());
}
///SendTextMessage()
///this function is to send a sms
void SendTextMessage()
{
mySerial.println("AT+CMGF=1"); //Because we want to send the SMS in text mode
delay(100);
mySerial.println("AT+CMGS=\"+91******\"\r"); // change to the phone number you using
delay(100);
mySerial.println("A test message!");//the content of the message
delay(100);
mySerial.println((char)26);//the ASCII code of the ctrl+z is 26
delay(100);
}
///RecieveTextMessage()
///this function is to show received a sms
void RecieveTextMessage()
{
mySerial.println("AT+CMGF=1\r");
delay(200);
//mySerial.println("AT+CNMI=2,2,0,0,0");
//delay(200);
//mySerial.println("AT+CSCS=\"GSM\"\r");
//delay(100);
mySerial.println("AT+CMGL=\"ALL\"\r"); // to read ALL the SMS in text mode
delay(200);
//mySerial.println("AT+CMGR=3\r");// to read the SMS in text mode from location x
//delay(100);
}
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