LILYGO T-SIM A7608 Series ESP32 Development Board User Manual

1. Introduction

The LILYGO T-SIM A7608 series development boards, including models T-A7608SA-H and T-A7608E-H, are versatile modules designed for advanced IoT and communication projects. Both models are equipped with an ESP32 chip, enabling integrated Wi-Fi and Bluetooth functionalities. They also feature dedicated slots for a SIM card and a TF card, expanding their capabilities for cellular communication and data storage.

A significant enhancement in the T-A7608SA-H and T-A7608E-H models, compared to their predecessors (T-A7608SA and T-A7608E), is the optimized LTE Cat 4 performance. The data transfer rates have been substantially improved, with download links (DL) and upload links (UL) now ten times faster, reaching up to 150Mbps (DL) and 50Mbps (UL). This makes them suitable for high-speed 4G network applications.

Users can choose between two optional versions: one with integrated GPS functionality and one without. For detailed technical documentation and programming examples, please refer to the official GitHub repository: https://github.com/Xinyuan-LilyGO/LilyGO-T-A7608X.

2. Safety Information

• Handle the development board with care to avoid damage to sensitive electronic components.
• Ensure proper power supply within the specified voltage range (DC 3.4V~4.2V) to prevent malfunction or damage.
• Avoid exposing the board to moisture, extreme temperatures, or static electricity.
• When connecting external components, ensure correct polarity and pin assignments to prevent short circuits or component failure.
• Always disconnect power before making or changing connections.

3. Product Overview

The LILYGO T-SIM A7608 series development board integrates various components to provide comprehensive communication and processing capabilities. Below is a diagram highlighting the key features and components:

Key Components:

• ESP32 Module: Provides Wi-Fi (802.11 b/g/n) and Bluetooth (v4.2 BR/EDR and BLE) connectivity.
• A7608X-H Module: Offers LTE Cat 4 high-speed 4G network capabilities.
• 18650 Battery Holder: For portable power supply.
• Battery Switch: To control power from the 18650 battery.
• Reset Button: For resetting the ESP32 and A7608X-H modules.
• Boot Programmable Button: Used for entering bootloader mode for firmware flashing.
• Type-C USB Port: For power, charging, and USB-to-Serial communication (burn/debug).
• Micro USB Port: Functions as a portable network card interface.
• TF Card Holder: For external data storage.
• SIM Main Slot: For inserting a Nano SIM card for cellular connectivity.
• Antenna Holder: For connecting the LTE antenna.
• GNSS Holder: (GPS Version Only) For connecting the GPS antenna.
• Solar Panels Input Range: DC 4.4V ~ 6V for alternative power input.

Both T-A7608SA-H and T-A7608E-H models share these core functionalities, differing primarily in their supported regional frequency bands for LTE/GSM.

4. Specifications

The following tables detail the technical specifications of the LILYGO T-SIM A7608 series development boards:

General Specifications:

Communication Specifications:

5. Setup

Follow these steps to set up your LILYGO T-SIM A7608 series development board:

5.1 Component Installation

1. Insert SIM Card: Carefully insert a Nano SIM card into the SIM Main slot. Ensure correct orientation.
2. Insert TF Card: If desired, insert a TF card into the TF card holder for additional storage.
3. Connect LTE Antenna: Attach the provided LTE antenna to the Antenna Holder.
4. Connect GPS Antenna (if applicable): If you have the GPS version, connect the GPS antenna to the GNSS Holder.
5. Install 18650 Battery: Insert an 18650 battery into the battery holder, observing correct polarity.
6. External Connections: For custom applications, refer to the pinout diagrams below for connecting external sensors or peripherals. A 16PIN 2.54mm terminal is available for such connections.

5.2 Powering the Board

The board can be powered in several ways:

• Type-C USB: Connect a Type-C USB cable to the board and a power source (e.g., computer, USB charger). This port also supports charging the 18650 battery.
• 18650 Battery: Ensure the battery switch is in the 'ON' position if using the installed 18650 battery.
• Solar Panels: Connect solar panels to the designated input, ensuring the voltage is within the DC 4.4V ~ 6V range.

5.3 Pinout Diagrams

Refer to the following diagrams for detailed pin assignments for each model:

6. Operating Instructions

6.1 Initial Power On

After completing the setup, switch on the battery if using an 18650 battery, or connect the Type-C USB cable. The board should power on, and indicator LEDs may light up.

6.2 Firmware Upload (Burn/Debug)

To upload custom firmware or debug your code:

1. Connect the board to your computer using the Type-C USB cable.
2. Press and hold the 'Boot' programmable button.
3. Press and release the 'Reset' button.
4. Release the 'Boot' button. The board is now in bootloader mode.
5. Use your preferred ESP32 development environment (e.g., Arduino IDE, PlatformIO) to upload your code.

6.3 Using as a Portable Network Card

The Micro USB port allows the board to function as a portable network card:

1. Ensure a functional SIM card is inserted and the LTE antenna is connected.
2. Connect the board to your computer via the Micro USB port.
3. Your computer should recognize the device and potentially install necessary drivers (refer to GitHub for driver links if needed).
4. Configure your computer's network settings to use the board as a network interface.

6.4 AT Command Control

The A7608X-H module can be controlled using AT commands for various cellular functions (e.g., sending SMS, making calls, managing data connections). These commands can be sent via the serial interface (accessible through the Type-C USB port for debugging) from your ESP32 code or a serial terminal.

7. User Tips

• Leverage GitHub Resources: The official LILYGO GitHub repository (https://github.com/Xinyuan-LilyGO/LilyGO-T-A7608X) is an invaluable resource for example code, libraries, and detailed documentation. It's highly recommended for development.
• Wi-Fi and Bluetooth: Remember that the integrated ESP32 chip provides full Wi-Fi and Bluetooth capabilities, allowing for local connectivity alongside the 4G cellular functions.
• Power Management: When running on battery, consider optimizing your code for low power consumption to extend battery life. The solar input offers a great option for remote, self-sustaining projects.
• Antenna Placement: For optimal cellular and GPS (if applicable) performance, ensure antennas are placed in an open area, away from obstructions or other electronic interference.

8. Troubleshooting

• Board Not Powering On: Check the power source (USB cable, 18650 battery, solar input) and ensure the battery switch is 'ON'. Verify the power supply voltage is within the 3.4V~4.2V range.
• No Cellular Connection: Ensure the SIM card is correctly inserted and activated with a data plan. Check that the LTE antenna is securely connected. Verify that your chosen board model (T-A7608SA-H or T-A7608E-H) supports the frequency bands in your region.
• GPS Not Working (GPS version): Ensure the GPS antenna is connected and has a clear view of the sky. GPS signal acquisition can take some time, especially on first use.
• Firmware Upload Issues: Double-check that the board is in bootloader mode (Boot button pressed, Reset button cycled). Ensure correct drivers are installed on your computer and the correct COM port is selected in your IDE.
• Wi-Fi/Bluetooth Connectivity Problems: Verify your ESP32 code for Wi-Fi/Bluetooth initialization and connection logic. Ensure no hardware conflicts with other peripherals.

9. Maintenance

• Cleaning: Keep the board clean and free from dust and debris. Use a soft, dry brush or compressed air for cleaning. Avoid liquid cleaners.
• Storage: Store the board in a dry, anti-static environment when not in use.
• Software Updates: Regularly check the LILYGO GitHub repository for updated firmware, libraries, and documentation to ensure optimal performance and access to new features.

10. Warranty and Support

For any questions, issues, or support needs, please contact LILYGO customer service. They are available to assist with product inquiries, technical support, and resolution of any problems you may encounter.

Customer Service Notes:

• If you have any questions or are unclear about your product, please do not hesitate to contact LILYGO for a satisfactory solution.
• For customization requests, bulk orders, or any specific product-related questions, feel free to reach out to customer service.