GSM Module SIM900A giving error

Projects Programming
21

This is an example passthrough sketch for testing...

#define BAUD 115200

SoftwareSerial softSerial (8, 9);  // Rx, Tx as required.


void setup()
{
  Serial.begin(BAUD);
  softSerial.begin(BAUD);

  Serial.print("Ready @ ");
  Serial.print(BAUD);
  Serial.println(" baud");
}


void loop()
{
  while (Serial.available() > 0)
    softSerial.write(Serial.read());

  while (softSerial.available() > 0)
    Serial.write(softSerial.read());
}

First thing you should do is send an AT+IPR=19200 command in the serial monitor, then change the sketch to same baud rate, and re-upload.

Then you can send commands directly to the modem.

Note that some commands, like sending a text, required the sending of characters that you can't type in the monitor, so you need a slightly different approach for these... when you get that far.

22

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