note for SM5100B-D Cellular shield

Wireless & IoT
1
  1. The code.
#include <NewSoftSerial.h>  //Include the NewSoftSerial this creates a fake serial port on a normal digital input/output pin
char incoming_char=0;       //Initiate a variable that will hold the incoming character from the Serial Port.
NewSoftSerial cell(2,3);    //Create a 'fake' serial port. Pin 2 is the Rx pin, pin 3 is the Tx pin.

void setup()                //This functions runs once when the arduino starts up.
{
  Serial.begin(9600);      //Initialize serial ports for communication.
  cell.begin(9600);        //Initialize 'fake' serial ports for communication.
  Serial.println("Starting SM5100B Communication...");   //Print to the serial monitor so you know what's going on.
  delay(3000);
  //cell.print("AT+IPR=9600");
}

void loop()                        //This function runs continually... you might say it 'loops'... get it?
{
  if(cell.available() >0)         //If a character comes in from the cellular module...
  {
    incoming_char=cell.read();   //Get the character from the cellular serial port.
    Serial.print(incoming_char); //Print the incoming character to the terminal.

  }

  if(Serial.available() >0)       //If a character is coming from the terminal to the Arduino...
  {

    incoming_char=Serial.read(); //Get the character coming from the terminal
    cell.print(incoming_char);   //Send the character to the cellular module.
    
  }
}
  1. if you get the wrong display after Starting SM5100B Communication… in the serial port monitor.

not like this:

Starting SM5100B Communication...
    
+SIND: 1

+SIND: 10,"SM",1,"FD",1,"LD",1,"MC",1,"RC",1,"ME",1

+SIND: 11

+SIND: 3

+SIND: 4

you need change the baud rate of your sm5100b to 9600, as newsoftserial cannot work with 115200. see viewtopic.php?f=14&t=22883. thanks Whoismaha.

You may need a FTDI cable,

(Suppose the code NewSoftSerial cell(2,3); used)

FTDI ------------- SM5100B

GND ------------- Digital GND

RX(Yellow) ------------- Digital #2

TX(Orange) ------------- Digital #3

  1. if you get +SIND 8, then you may need change the band setting.
+SIND: 1

+SIND: 10,"SM",1,"FD",1,"LD",1,"MC",1,"RC",1,"ME",1

+SIND: 3

+SIND: 8

+SIND: 4

AT+SBAND=X

check with your service provider to see which frequency is the right one.

Refer the SM5100B-D AT Command Page 127 AT+SBAND for detail

Reference value:0-10
value description
0 GSM900
1 DCS1800
2 PCS1900
3 GSM850
4 GSM900&DCS1800
5 GSM850&GSM900
6 GSM850&DCS1800
7 GSM850&PCS1900
8 GSM900&PCS1900
9 GSM850&GSM900&DCS1800

You should be good to go.

:roll:

2

No, you are not good to go at that point. The module returns CME ERROR 0 in response to AT+SBAND=7.

Does this mean I have a module that is only good for China and cannot be used in North America? Or is that command locked in some way?

3

I’m stuck in the same boat… any ideas on how to get this resolved?

Thanks

Tony