How to Use SIM7600-4G-Hat-B: Examples, Pinouts, and Specs

The SIM7600-4G-HAT-B is a versatile 4G LTE module designed by Waveshare for use with Raspberry Pi and other microcontroller platforms. It provides high-speed mobile data communication, voice call functionality, SMS capabilities, and GPS positioning. This HAT (Hardware Attached on Top) is ideal for IoT applications, remote monitoring, vehicle tracking, and other projects requiring reliable cellular connectivity and GPS functionality.

• IoT Projects: Remote sensors, smart agriculture, and industrial automation.
• GPS Tracking: Vehicle tracking, fleet management, and geolocation services.
• Mobile Data Communication: Internet access for Raspberry Pi or other devices.
• SMS and Voice Communication: Sending/receiving SMS and making voice calls.
• Remote Monitoring: Security systems, weather stations, and telemetry.

The SIM7600-4G-HAT-B connects to the Raspberry Pi via the GPIO header. Below is the pinout:

1. Hardware Setup:

   • Attach the SIM7600-4G-HAT-B to the Raspberry Pi GPIO header.
   • Insert a micro-SIM card into the SIM card slot on the HAT.
   • Connect an external antenna to the SMA connectors for LTE and GPS.
   • Power the Raspberry Pi and ensure the HAT is properly powered.

2. Software Setup:

   • Install the required drivers and libraries for the SIM7600 module.
   • Configure the UART interface on the Raspberry Pi by enabling the serial port in the Raspberry Pi configuration menu.
   • Use AT commands to communicate with the module for tasks like sending SMS, making calls, or accessing GPS data.

3. Basic AT Command Example:

   • Open a serial terminal (e.g., minicom or screen) to send AT commands to the module.
   • Example commands:
     • AT → Check if the module is responsive.
     • AT+CSQ → Check signal quality.
     • AT+CGATT? → Check if the module is attached to the network.

• Ensure the SIM card is activated and has a valid data plan.
• Use an external power supply if the Raspberry Pi's GPIO pins cannot provide sufficient current.
• Place the antenna in an open area for better signal reception.
• Avoid placing the module near high-frequency noise sources to prevent interference.

Although the SIM7600-4G-HAT-B is primarily designed for Raspberry Pi, it can also be used with an Arduino UNO. Below is an example code snippet for sending an SMS using the module:

#include <SoftwareSerial.h>

// Define RX and TX pins for SoftwareSerial
SoftwareSerial sim7600(10, 11); // RX = 10, TX = 11

void setup() {
  // Initialize serial communication
  Serial.begin(9600); // For debugging
  sim7600.begin(9600); // For SIM7600 communication

  // Wait for the module to initialize
  delay(1000);
  Serial.println("Initializing SIM7600...");

  // Send AT command to check module response
  sim7600.println("AT");
  delay(1000);
  while (sim7600.available()) {
    Serial.write(sim7600.read());
  }

  // Set SMS text mode
  sim7600.println("AT+CMGF=1"); // Set SMS to text mode
  delay(1000);

  // Send SMS
  sim7600.println("AT+CMGS=\"+1234567890\""); // Replace with recipient's phone number
  delay(1000);
  sim7600.println("Hello from SIM7600!"); // SMS content
  delay(1000);
  sim7600.write(26); // Send Ctrl+Z to indicate end of message
  delay(5000);

  Serial.println("SMS sent!");
}

void loop() {
  // Nothing to do here
}

1. Module Not Responding to AT Commands:

   • Ensure the module is powered on (check the PWRKEY pin).
   • Verify the UART connections (TXD and RXD) are correct.
   • Check the baud rate settings in your serial terminal or code.

2. No Network Connection:

   • Confirm the SIM card is inserted correctly and has an active data plan.
   • Check the antenna connection and ensure it is placed in an area with good signal coverage.
   • Use the AT+CSQ command to check signal strength (values above 10 are acceptable).

3. GPS Not Working:

   • Ensure the GPS antenna is connected to the correct SMA port.
   • Place the antenna in an open area with a clear view of the sky.
   • Use the AT+CGNSPWR=1 command to enable GPS functionality.

4. Power Issues:

   • If the module restarts frequently, ensure the power supply can provide sufficient current (at least 2A).

• Q: Can I use this module with microcontrollers other than Raspberry Pi?
  A: Yes, the SIM7600-4G-HAT-B can be used with Arduino, ESP32, and other microcontrollers via UART or USB.

• Q: What is the maximum data speed supported by the module?
  A: The SIM7600 supports LTE Cat-4 with download speeds up to 150 Mbps and upload speeds up to 50 Mbps.

• Q: How do I update the firmware of the SIM7600 module?
  A: Firmware updates can be performed via the USB interface using tools provided by the manufacturer.

• Q: Can I use this module for voice calls?
  A: Yes, the SIM7600 supports voice calls. Use AT commands like ATD to dial a number.

This documentation provides a comprehensive guide to using the SIM7600-4G-HAT-B module. For further details, refer to the official Waveshare documentation or contact their support team.