actually i am trying to sent a message with the help of arduino leonardo and Sim 900 gsm modem(sms application note:http://www.nskelectronics.com/files/sim900_sms_app_note.pdf)but i couldn't.i am using this code
void setup()
{
Serial.begin(9800);
Serial1.begin(115200);
delay(10000);
Serial.println("set up comms");
delay(5000);
Serial.println("Switching to text mode");
delay(2000);
Serial1.println("AT+CMGF=1");
delay(2000);
Serial1.println("AT+CSCS="GSM"");
delay(500);
Serial1.println("AT+CSCA="919840011003"");
delay(500);
Serial1.println("AT+CSMP=17, 167, 0, 240");
delay(500);
Serial.println("Selecting number");
delay(500);
Serial1.println("AT+CMGS="9092830876"");
delay(500);
Serial.println("Typing message");
delay(500);
Serial1.println("TEST.");
delay(500);
Serial.println("sending ctrl-z");
delay(500);
Serial1.write(0x1A);
delay(500);
Serial1.println();
}
void loop()
{
if (Serial1.available())
Serial.write(Serial1.read());
}
and the response is
set up comms
Switching to text mode
Selecting number
Typing message
sending ctrl-z
AT+CMGF=1
AT+CSCS="GSM"
AT+CSCA="919840011003"
AT+CSMP=17, 1