LILYGO® TTGO T-Internet-COM ESP32 Wifi Bluetooth Board Instruction Manual

1. Introduction

The LILYGO® TTGO T-Internet-COM is a versatile development board designed for Internet of Things (IoT) applications, featuring an ESP32 microcontroller with integrated Wi-Fi and Bluetooth capabilities. It also includes an Ethernet interface, a SIM card slot, a TF card slot, and a Type-C connector, making it suitable for a wide range of networking and data storage projects. This manual provides essential information for setting up, operating, and maintaining your T-Internet-COM board.

2. Specifications

The LILYGO® TTGO T-Internet-COM board offers the following technical specifications:

3. Setup and Pinout

Before using your T-Internet-COM board, familiarize yourself with its components and pin assignments.

3.1 Component Overview

3.2 Pinout Diagram

The following diagram illustrates the pin assignments for the T-Internet-COM board. This is crucial for connecting external components and programming the board.

3.3 Initial Setup

1. Power Supply: Connect a DC 5-12V power source to the terminal block or use the Type-C USB port for power and data.
2. USB Connection: Connect the board to your computer using a Type-C USB cable. This will provide power and enable communication for programming.
3. Driver Installation: Depending on your operating system, you may need to install drivers for the CH340K or CH9102 USB-to-TTL chip. These are typically available from the chip manufacturer's website or LILYGO's GitHub.
4. Development Environment: Set up your preferred ESP32 development environment (e.g., Arduino IDE with ESP32 board support, ESP-IDF).
5. SIM/TF Card Insertion (Optional): If using cellular or local storage, carefully insert the SIM card and/or TF card into their respective slots. Ensure correct orientation. Note that SIM/TF cards are not included by default.
6. T-PCIE Module Installation (Optional): If using a T-PCIE module (e.g., for cellular connectivity), carefully insert it into the Mini PCIE adapter slot. Secure it with the provided M2.5x5mm screws. Note that T-PCIE modules are not included by default.

4. Operating Instructions

The T-Internet-COM board is designed for custom programming and integration into IoT projects. Operation primarily involves writing and uploading firmware.

4.1 Programming the ESP32

1. Connect: Ensure the board is connected to your computer via the Type-C USB port.
2. Select Board: In your IDE (e.g., Arduino IDE), select the appropriate ESP32 board (e.g., "ESP32 Dev Module" or similar, depending on your setup).
3. Select Port: Choose the serial port corresponding to the CH340K/CH9102 chip.
4. Upload Code: Write or load your ESP32 code (sketch) and click the upload button. The IDE will compile and upload the firmware to the board.
5. Monitor Serial Output: Use the serial monitor in your IDE to view debug messages and interact with your program.

4.2 Network Connectivity

• Wi-Fi: Utilize the ESP32's built-in Wi-Fi capabilities to connect to local networks or create an access point.
• Bluetooth: Leverage BLE V4.2 for short-range communication with other Bluetooth-enabled devices.
• Ethernet: Connect an Ethernet cable to the RJ45 port for wired network access. The LAN8720 transceiver handles the physical layer.
• Cellular (with T-PCIE module): If a compatible T-PCIE cellular module is installed, use the appropriate libraries and AT commands to establish cellular data connections.

4.3 Data Storage

The TF card slot allows for local data storage, which can be useful for logging sensor data, storing configuration files, or serving web content.

5. Maintenance

To ensure the longevity and reliable operation of your T-Internet-COM board, follow these maintenance guidelines:

• Keep Clean: Regularly clean the board with a soft, dry brush to remove dust and debris. Avoid using liquids.
• Proper Storage: Store the board in an anti-static bag when not in use, especially if it will be stored for extended periods.
• Handle with Care: Avoid touching the electronic components directly to prevent electrostatic discharge (ESD) damage.
• Power Off Before Changes: Always disconnect power before inserting or removing SIM cards, TF cards, or T-PCIE modules.
• Firmware Updates: Keep your ESP32 firmware and libraries updated to benefit from bug fixes and new features.

6. Troubleshooting

Here are some common issues and their potential solutions:

• Board not recognized by computer:
  • Ensure the Type-C USB cable is fully connected and functional.
  • Install the correct drivers for the CH340K/CH9102 USB-to-TTL chip.
  • Try a different USB port or computer.
• Failed to upload firmware:
  • Verify that the correct ESP32 board and serial port are selected in your IDE.
  • Hold down the "BOOT" button while pressing and releasing "RST", then release "BOOT" to enter bootloader mode for uploading.
  • Check for compilation errors in your code.
• Wi-Fi/Ethernet not connecting:
  • Double-check network credentials (SSID, password) for Wi-Fi.
  • Ensure the Ethernet cable is properly connected and the network is active.
  • Verify that your code correctly initializes and configures the network interfaces.
• T-PCIE module not detected:
  • Ensure the T-PCIE module is correctly seated in its slot and secured.
  • Verify that your firmware includes the necessary libraries and code to communicate with the specific T-PCIE module.
  • Check the module's power supply and connections.

7. User Tips

• Community Resources: LILYGO provides a GitHub repository (https://github.com/Xinyuan-LilyGO/T-Internet-COM) with examples and documentation. This is an excellent resource for code samples and further technical details.
• Power Considerations: When using power-intensive modules (like cellular T-PCIE modules), ensure your power supply can provide sufficient current.
• Experimentation: The ESP32 ecosystem is vast. Explore different libraries and examples to unlock the full potential of your T-Internet-COM board for various IoT applications.

8. Support and Warranty

For technical support, documentation, and community resources, please refer to the official LILYGO GitHub page and their official store. LILYGO is known for providing open-source resources to assist developers.

If you encounter issues with the product upon receipt, such as unclear orders, damaged packages, or product defects, please contact the seller directly for assistance. They are committed to providing satisfactory solutions.

This product is intended for development and prototyping. Standard warranty terms apply as per the seller's policy at the time of purchase. Please retain your purchase records for any warranty claims.