Arduino Mega 2560 & SIM900 Module

Projects Networking, Protocols, and Devices
1

Hi,

I have an Arduino Mega 2560 & Sim900 Module, both are well connected and tested.

Connection:

  • 5v & GND from Arduino Mega is connected to 5v & GND to SIM900 Modem Card
  • Jumper setting on SIM900 Modem Card is set to use pin (Not SerialSoftware):

SIM900 Arduino Mega2560
0 (TX) -----------> 1(TX0)
1 (RX) -----------> 0(RX0)

  • Arduino Mega is connected using USB cable.
  • Using docklight v2.3 connected to Arduino Mega by USB y can reach the SIM900 over USB cable. AT commend respond OK with no erros.
  • When i send manually an SMS using docklight, everything working fine. SMS sent to proper destiny with no errors.

After testing, where i verified that every component is working fine i tried to send SMS by script and it doesn't work, using the same AT commend that i used during testing stage.

Could some one help me on this issue?

AT commands used for send SMS

AT+CMGF=1 //Prepare Modem for Text SMS
AT+CMGS="+569XXXXXXXX" //Set SMS destiny

ATENCION : Alarma Activada. //Set SMS content
CTRL+Z //Close SMS with CTRL+Z

Script

void setup() {
// put your setup code here, to run once:

Serial.begin(19200); //Setup BaudRate

}

void loop() {
// put your main code here, to run repeatedly:

Serial.println("AT+CMGF=1"); //Prepare Modem for Text SMS
delay(500);
Serial.println("AT+CMGS="+56992195858""); //Set SMS destiny
delay(500);
Serial.println("ATENCION : Alarma Activada."); //Set SMS content
delay(500);
Serial.println((char)26); //Close SMS with CTRL+Z
delay(500);

Serial.println("Waiting 30 sec");
delay(30000); //Wait 30sec for loop
Serial.println("Starting again ...");

}

2

Finally i found then error.

The test that i did was using a missing on pins connection.

Thanks any way.