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

The T-SIM7000G is a versatile GSM/GPRS module manufactured by ESP32, designed for IoT 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. The T-SIM7000G is widely used in applications such as smart metering, asset tracking, environmental monitoring, and remote data collection.

• IoT devices requiring cellular connectivity
• GPS-based location tracking systems
• Smart agriculture and environmental monitoring
• Remote data logging and telemetry
• Smart home and industrial automation

Below are the key technical details of the T-SIM7000G module:

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

1. Power Supply: Connect the VCC pin to a stable power source (3.7V to 4.2V) and GND to ground. Ensure the power supply can handle the module's peak current requirements.
2. UART Communication: Connect the TXD and RXD pins to the UART pins of your microcontroller (e.g., ESP32 or Arduino UNO). Use a logic level converter if your microcontroller operates at 5V logic.
3. Powering On: Pull the PWRKEY pin low for at least 1 second to turn on the module.
4. Antenna Connection: Attach a suitable GSM/LTE antenna to the module's antenna connector for reliable communication.
5. GPS Functionality: Connect the GPS_TX and GPS_RX pins to your microcontroller's UART interface to receive GPS data.

• Use decoupling capacitors near the power pins to stabilize the power supply.
• Ensure the antenna is properly connected to avoid damage to the RF circuitry.
• Place the module in an area with good cellular and GPS signal reception.
• For low-power applications, utilize the module's PSM (Power Saving Mode) to reduce power consumption.

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 = Pin 7, TX = Pin 8

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

  Serial.println("Initializing T-SIM7000G...");
  delay(1000);

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

  // Set SMS text mode
  sim7000.println("AT+CMGF=1"); // Set SMS to text mode
  delay(1000);

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

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

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

• Replace +1234567890 with the recipient's phone number.
• Ensure the SIM card is inserted and has sufficient balance for sending SMS.

1. Module Not Powering On:

   • Ensure the power supply voltage is within the specified range (3.7V to 4.2V).
   • Check the PWRKEY pin connection and hold it low for at least 1 second.

2. No Network Connection:

   • Verify the SIM card is properly inserted and activated.
   • Check the antenna connection and ensure good signal reception.
   • 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. No Response to AT Commands:

   • Verify the UART connections (TXD, RXD) and baud rate settings.
   • Check if the module is powered on and properly initialized.

Q1: Can the T-SIM7000G work with 5V microcontrollers?
A1: Yes, but you need a logic level converter for the UART pins to avoid damaging the module.

Q2: How do I enable low-power mode?
A2: Use the AT+CSCLK=1 command to enable sleep mode or configure PSM using AT+CPSMS.

Q3: What is the maximum data rate supported?
A3: The T-SIM7000G supports LTE Cat-M1 and NB-IoT, with data rates up to 375 kbps (uplink) and 300 kbps (downlink).

Q4: Can I use the module for voice calls?
A4: No, the T-SIM7000G is designed for data communication and does not support voice calls.