How to Use T-SIM7000G edited: Examples, Pinouts, and Specs

The T-SIM7000G is a versatile GSM/GPRS module manufactured by ESP32, designed for IoT (Internet of Things) applications. It supports multiple communication protocols, including LTE, and features low power consumption, making it ideal for battery-powered devices. Additionally, the module includes GPS functionality, enabling location tracking and navigation capabilities. The T-SIM7000G is widely used in applications such as smart metering, asset tracking, environmental monitoring, and remote data collection.

The T-SIM7000G module is packed with features that make it suitable for a wide range of IoT applications. Below are its key technical specifications:

• Manufacturer: ESP32
• Communication Protocols: GSM, GPRS, LTE Cat-M1, NB-IoT
• GPS Support: Yes (GNSS functionality)
• Power Supply Voltage: 3.4V to 4.2V (typical 3.8V)
• Power Consumption:
  • Idle: ~1.2mA (low power mode)
  • Active: ~300mA (transmitting)
• Operating Temperature: -40°C to +85°C
• Dimensions: 24mm x 24mm

The T-SIM7000G module has a variety of pins for power, communication, and control. Below is the pinout description:

The T-SIM7000G module can be integrated into a circuit for IoT applications. Below are the steps and best practices for using the module:

1. Power Supply:

   • Connect the VCC pin to a stable 3.8V power source.
   • Ensure the GND pin is connected to the ground of the circuit.

2. Serial Communication:

   • Connect the TXD pin of the module to the RX pin of your microcontroller (e.g., Arduino UNO).
   • Connect the RXD pin of the module to the TX pin of your microcontroller.

3. Powering On:

   • Pull the PWRKEY pin low for at least 1 second to turn on the module.

4. Antenna Connection:

   • Attach a compatible antenna to the module for GSM and GPS functionality.

Below is an example code to send an SMS using the T-SIM7000G module with an Arduino UNO:

#include <SoftwareSerial.h>

// Define RX and TX pins for SoftwareSerial
SoftwareSerial sim7000(7, 8); // RX = 7, TX = 8

void setup() {
  // Initialize serial communication
  Serial.begin(9600); // For debugging
  sim7000.begin(9600); // For T-SIM7000G communication

  Serial.println("Initializing T-SIM7000G...");

  // Power on the module
  pinMode(9, OUTPUT); // PWRKEY connected to pin 9
  digitalWrite(9, LOW);
  delay(1000); // Hold PWRKEY low for 1 second
  digitalWrite(9, HIGH);

  delay(5000); // Wait for the module to initialize

  // Send AT command to check communication
  sim7000.println("AT");
  delay(1000);
  while (sim7000.available()) {
    Serial.write(sim7000.read());
  }

  // Send SMS
  sim7000.println("AT+CMGF=1"); // Set SMS mode to text
  delay(1000);
  sim7000.println("AT+CMGS=\"+1234567890\""); // Replace with recipient's number
  delay(1000);
  sim7000.println("Hello from T-SIM7000G!"); // SMS content
  sim7000.write(26); // Send Ctrl+Z to send the SMS
  delay(5000);
}

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

• Use a stable power supply to avoid unexpected resets or malfunctions.
• Ensure proper antenna placement for optimal GSM and GPS signal reception.
• Use level shifters if interfacing with a 5V microcontroller, as the module operates at 3.3V logic levels.
• Avoid placing the module near high-frequency noise sources to prevent interference.

1. Module Not Powering On:

   • Ensure the PWRKEY pin is pulled low for at least 1 second during startup.
   • Verify the power supply voltage is within the specified range (3.4V to 4.2V).

2. No Network Connection:

   • Check the antenna connection and ensure it is securely attached.
   • Verify that the SIM card is properly inserted and activated.
   • Use the AT+CSQ command to check signal strength.

3. GPS Not Working:

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

4. Serial Communication Issues:

   • Confirm the baud rate of the module matches the microcontroller's settings.
   • Check the wiring of the TX and RX pins.

• Q: Can the T-SIM7000G operate on 5V logic levels?
  A: No, the module operates at 3.3V logic levels. Use level shifters if interfacing with a 5V microcontroller.

• Q: How do I check the module's firmware version?
  A: Use the AT+CGMR command to retrieve the firmware version.

• Q: What is the maximum data rate supported by the module?
  A: The T-SIM7000G supports a maximum data rate of 375kbps for LTE Cat-M1 and 32kbps for NB-IoT.

• Q: Can I use the module for voice calls?
  A: Yes, the T-SIM7000G supports voice calls in addition to SMS and data communication.

By following this documentation, users can effectively integrate and utilize the T-SIM7000G module in their IoT projects.