Arduino UNO and SIM7600G-H CAT4 4G (LTE) shield

Support Arduino
1

Hi All,

I am having difficulties getting my Arduino Uno to work with a SIM7600G-H CAT4 4G (LTE) shield.
Currently, I am trying to set it up to send/receive text messages with a push button. My code is below. I am using a Telstra SIM card.

#include <SoftwareSerial.h>

SoftwareSerial sim7600Serial(7, 8);  // RX, TX 

void setup() {
  Serial.begin(9600);
  while (!Serial); // Wait for Serial Monitor to open
  sim7600Serial.begin(9600);

  Serial.println("Initializing SIM7600...");

  // Initialize SIM7600 module
  sendATCommand("AT");

  // Set SIM7600 to SMS text mode
  sendATCommand("AT+CMGF=1");

  // Set SIM7600 to show new SMS notifications
  sendATCommand("AT+CNMI=1,2,0,0,0");
}

void loop() {
  // Check for new SMS
  if (sim7600Serial.available()) {
    Serial.write(sim7600Serial.read());
  }

  // Example: Send SMS
  sendSMS("+61(phonenumber)", "Hello from SIM7600!");
  delay(10000); // Adjust delay as necessary between SMS sends
}

void sendATCommand(String command) {
  sim7600Serial.println(command);
  delay(500); // Adjust delay as necessary

  while (sim7600Serial.available()) {
    Serial.write(sim7600Serial.read());
  }
}

void sendSMS(String phoneNumber, String message) {
  // Set SMS text mode
  sendATCommand("AT+CMGF=1");
  delay(1000); // Wait for response

  // Specify phone number and message
  sim7600Serial.print("AT+CMGS=\"");
  sim7600Serial.print(phoneNumber);
  sim7600Serial.println("\"");

  delay(1000); // Wait for response

  // Send message content
  sim7600Serial.print(message);
  sim7600Serial.println((char)26); // End message with Ctrl+Z

  delay(1000); // Wait for response
}
2

Hi Dean,

Welcome to the forum!

I found this post on Arduino’s forums where someone else was having difficulty setting one of these shields up. Have a read through here. The poster did come to a solution that worked for them

1 Like
3

Hello, are you facing any problem with your setup?