LILYGO T-SIM7670G-S3 LTE 4G ESP32-S3 Development Board User Manual

1. Introduction

The LILYGO T-SIM7670G-S3 is a versatile development board designed for Internet of Things (IoT) applications requiring cellular connectivity (LTE 4G), GPS, Wi-Fi, and Bluetooth. It integrates the powerful ESP32-S3 microcontroller with a SIM7670G cellular module, offering low-power consumption and long-range communication capabilities. This manual provides essential information for setting up, operating, and troubleshooting your T-SIM7670G-S3 board.

Figure 1: Front and back view of the LILYGO T-SIM7670G-S3 development board, showing components and battery holder.

2. Package Contents

Please verify that all items listed below are included in your package:

1 x LILYGO T-SIM7670G-S3 Development Board
1 x LTE Antenna
1 x PH2.0 Battery Cable
2 x 16-Pin Headers
1 x GPS Antenna

Figure 2: Contents of the LILYGO T-SIM7670G-S3 package, including the board, LTE antenna, PH2.0 battery cable, 2x 16-pin headers, and GPS antenna.

3. Specifications

The LILYGO T-SIM7670G-S3 development board features the following technical specifications:

Specifications table for T-SIM7672G, detailing MCU, LTE&GSM module, SIM/TF card support, clock speed, flash, PSRAM, wireless connectivity, peripheral interfaces, form factor, region, and dimensions.

Figure 3: Key specifications of the T-SIM7670G-S3 development board.

Table detailing frequency bands, data transfer speeds, GNSS, protocols, Android RIL, USB driver compatibility, supply voltage, SIM card voltage, and certifications.

Figure 4: Cellular and connectivity specifications.

General Specifications
Feature	Description
Model Number	T-SIM7670G-S3
Brand Name	lilygo
Chipset	ESP32-S3
Type	Bluetooth, WIFI
Compatible Equipment Style	Professional Audio Equipment (General purpose for development)
Dimensions (L x W x H)	110mm x 33mm x 22mm
Weight	0.08 kg

4. Setup and Installation

Follow these steps to set up your LILYGO T-SIM7670G-S3 development board:

Insert SIM Card: Locate the Nano SIM card slot on the board. Carefully insert a Nano SIM card into the slot. Ensure it is correctly oriented and fully seated.
Attach Antennas: Connect the provided LTE antenna to the main cellular antenna connector and the GPS antenna to its dedicated connector on the board. Ensure connections are secure.
Power Supply:
- USB Power: Connect the board to your computer using a USB-C cable. The board will draw power from the USB port.
- Battery Power: For portable applications, insert an 18650 battery into the battery holder on the back of the board. Ensure correct polarity (+/-). Use the PH2.0 battery cable if connecting an external battery pack.
Connect to Computer: Use a USB-C cable to connect the board to your computer. This connection will provide power and enable communication for programming and debugging.
Install Drivers (if necessary): Your operating system may automatically install necessary USB drivers. If not, you may need to download and install the appropriate USB-to-serial drivers for the ESP32-S3 chipset.
Prepare Development Environment: Set up your preferred ESP32-S3 development environment (e.g., Arduino IDE with ESP32 board support, ESP-IDF) on your computer.

Detailed pin diagram for the LILYGO T-SIM7670G-S3 LTE Cat1 board, showing GPIOs, power pins, serial, I2C, SPI, TF card, and 18650 battery connections. It also indicates Nano SIM card support.

Figure 5: Product Pin Diagram for LILYGO T-SIM7670G-S3.

LILYGO T-SIM7670G-S3 development board with an 18650 battery holder on the back.

Figure 6: Board with 18650 battery holder.

5. Operating Instructions

The LILYGO T-SIM7670G-S3 is designed for advanced IoT development. Here are general operating guidelines:

Programming: Upload your ESP32-S3 code using the USB-C connection and your chosen development environment. The board supports standard ESP32-S3 programming methods.
Cellular Communication: Utilize the SIM7670G module for LTE 4G data communication. Ensure your SIM card is active and has a data plan. The module supports various protocols including TCP/IP, HTTP/HTTPS, MQTT, and more.
GPS Functionality: The integrated GPS module allows for location tracking. Ensure the GPS antenna is connected and has a clear view of the sky for optimal signal reception.
Wi-Fi and Bluetooth: The ESP32-S3 provides 2.4 GHz Wi-Fi (802.11 b/g/n) and Bluetooth 5 (LE) for local wireless connectivity.
Peripherals: The board exposes various peripheral interfaces such as I2C, SPI, UART, SDIO, I2S, and CAN, allowing integration with a wide range of sensors and actuators.
Power Management: The board is designed for low-power applications. Implement power-saving modes in your code to maximize battery life when using 18650 battery power.

Important Note: The LILYGO T-SIM7670G-S3 does NOT support SMS messaging or voice calls through the cellular module.

LILYGO T-SIM7670G-S3 development board with a clear label stating 'No support for SMS and with voice'.

Figure 7: Note regarding SMS and voice call support.

6. Maintenance

To ensure the longevity and optimal performance of your LILYGO T-SIM7670G-S3 development board, please observe the following maintenance guidelines:

Storage: Store the board in a dry, cool environment, away from direct sunlight and extreme temperatures. Use the provided protective case when not in use.
Cleaning: If necessary, gently clean the board with a soft, dry brush or compressed air to remove dust. Avoid using liquids or abrasive cleaners.
Handling: Always handle the board by its edges to avoid touching sensitive components and to prevent electrostatic discharge.
Firmware Updates: Regularly check the official LILYGO website or community forums for firmware updates for the ESP32-S3 and SIM7670G modules to ensure you have the latest features and bug fixes.

LILYGO T-SIM7670G-S3 development board packaged in a protective plastic case.

Figure 8: Board stored in its protective case.

7. Troubleshooting

If you encounter issues with your LILYGO T-SIM7670G-S3 board, refer to the following common problems and solutions:

Common Issues and Solutions
Problem	Possible Cause / Solution
Board not powering on	Check USB-C cable connection and power source. Ensure 18650 battery is inserted correctly with proper polarity and is charged. Verify the power switch (if present) is in the 'ON' position.
Computer not detecting the board	Ensure USB-C cable is functional and connected securely. Install or update the necessary USB-to-serial drivers for the ESP32-S3. Try a different USB port or computer.
Cellular module (SIM7670G) not connecting to network or detecting SIM	Ensure Nano SIM card is correctly inserted and active with a data plan. Verify the LTE antenna is securely connected. Check cellular signal strength in your location. Confirm your code correctly initializes and communicates with the SIM7670G module. Note: The board does not support SMS or voice calls.
GPS not acquiring a fix	Ensure the GPS antenna is securely connected. Place the board outdoors with a clear view of the sky. Allow sufficient time for the GPS module to acquire satellites (cold start can take several minutes).

8. User Tips

SIM Card Verification: Before use, always double-check that your Nano SIM card is properly inserted and activated with your cellular provider. Some users have reported initial difficulties with SIM detection, which can often be resolved by re-seating the card or ensuring it's fully pushed in.
No SMS/Voice Support: Remember that this board is designed for data communication and GPS. It does not support sending or receiving SMS messages, nor does it support voice calls. Plan your projects accordingly.
Power Optimization: For battery-powered applications, leverage the ESP32-S3's deep sleep and light sleep modes to significantly extend battery life.
Antenna Placement: For best cellular and GPS performance, ensure antennas are placed away from other electronic components and have an unobstructed path to the sky (for GPS).

9. Warranty and Support

LILYGO products are designed for reliability and performance. For technical support, documentation, or inquiries regarding your LILYGO T-SIM7670G-S3 development board, please contact the LILYGO Official Store or refer to their official website and community forums. Detailed resources, including code examples and further guides, are often available online.

Please retain your purchase receipt for any warranty claims.

	LILYGO T-BEAM-S3 User Guide: Setup and Development This user guide provides comprehensive instructions for setting up the LILYGO T-BEAM-S3 development board. Learn how to configure the software environment using Arduino IDE, connect the board, and utilize its Wi-Fi, BLE, GPS, and LoRa capabilities for IoT projects.
	LILYGO T-Display-S3 User Guide A user guide for the LILYGO T-Display-S3 development board, covering setup, Arduino IDE usage, and basic Wi-Fi commands.
	LILYGO T-WATCH S3 User Guide: Setup and Development with Arduino Learn to develop IoT applications with the LILYGO T-WATCH S3. This guide covers setting up the Arduino IDE, programming the ESP32-S3, and using SSC commands, provided by Xinyuan.
	LILYGO T-Dongle-S3 User Guide: Getting Started with ESP32-S3 Development A comprehensive user guide for the LILYGO T-Dongle-S3 development board. Learn how to set up your Arduino development environment, program the ESP32-S3 module, and explore Wi-Fi and Bluetooth features.
	LILYGO Mini E-Paper-S3 User Guide Comprehensive user guide for the LILYGO Mini E-Paper-S3 development board. Covers setup, Arduino IDE integration, firmware development, and Wi-Fi command reference for IoT applications.
	LILYGO T-Display-S3 Pro ESP32-S3 Development Board User Guide Comprehensive user guide for the LILYGO T-Display-S3 Pro ESP32-S3 development board. Covers setup of the Arduino IDE, software installation, configuration, connecting the board, and a reference for common Wi-Fi SSC commands.