LILYGO® TTGO T-Call V1.4 SIM800L Development Board User Manual

1. ບົດແນະນຳ

The LILYGO® TTGO T-Call V1.4 is a versatile development board designed for IoT applications, integrating an ESP32-WROVER-E module with a SIM800L GSM/GPRS module. This combination provides robust wireless communication capabilities, including Wi-Fi, Bluetooth, and 2G cellular connectivity. It is ideal for projects requiring internet access, SMS, calls, and data transmission in remote locations or where Wi-Fi is unavailable. This manual provides essential information for setting up, operating, and maintaining your TTGO T-Call V1.4 board.

2. ຜະລິດຕະພັນເກີນview

2.1 ລັກສະນະທີ່ສໍາຄັນ

• ESP32-WROVER-E Module: Integrated Wi-Fi (802.11 b/g/n) and Bluetooth (v4.2 BR/EDR and BLE) for diverse connectivity options.
• SIM800L GSM/GPRS Module: Enables 2G cellular communication for calls, SMS, and GPRS data.
• ຊ່ອງໃສ່ຊິມກາດ: Supports Nano SIM cards for cellular network access.
• ການໂຕ້ຕອບ USB-C: Modern connector for power supply, data communication, and programming.
• ຕົວເຊື່ອມຕໍ່ຫມໍ້ໄຟ: JST 2-pin connector for external LiPo battery power, allowing portable applications.
• Integrated Antenna Connector: For external SIM antenna to enhance cellular signal reception.
• GPIO Pins: Exposed General Purpose Input/Output pins for connecting various sensors and peripherals.
• ຫນ່ວຍຄວາມຈໍາ Flash: Available in 4MB or 8MB flash memory configurations.

2.2 ເນື້ອໃນຊຸດ

ກວດ​ສອບ​ວ່າ​ລາຍ​ການ​ທັງ​ຫມົດ​ແມ່ນ​ມີ​ຢູ່​ໃນ​ຊຸດ​ຂອງ​ທ່ານ​:

• LILYGO® TTGO T-Call V1.4 Development Board
• Pin Headers (2 sets)
• ເສົາອາກາດຊິມ
• Battery Connector Cable

3. ຂໍ້ມູນຈໍາເພາະ

4. ຄູ່ມືການຕິດຕັ້ງ

4.1 ແຜນວາດ Pinout

Understanding the pinout is crucial for connecting peripherals and programming the board. Refer to the diagram below for GPIO assignments and power connections.

4.2 ການເຊື່ອມຕໍ່ຮາດແວ

1. ໃສ່ຊິມກາດ Nano: Carefully open the SIM card slot and insert a Nano SIM card. Ensure it is correctly oriented.
2. Attach SIM Antenna: Connect the provided SIM antenna to the IPEX connector on the board. Ensure a secure connection for optimal cellular performance.

   

3. ເຊື່ອມຕໍ່ພະລັງງານ:
   • USB-C: Connect the board to your computer using a USB-C cable. This provides power and enables serial communication for programming.
   • ແບັດເຕີຣີ (ທາງເລືອກ): For portable applications, connect a compatible LiPo battery to the JST 2-pin connector.
4. Attach Pin Headers (Optional): Solder the included pin headers to the board if you plan to use it on a breadboard or with jumper wires.

4.3 ການຕິດຕັ້ງຊອບແວ

To program the TTGO T-Call V1.4, you will need to set up your development environment:

1. Install Arduino IDE or ESP-IDF: Download and install the Arduino IDE or Espressif IoT Development Framework (ESP-IDF) on your computer.
2. Install ESP32 Board Support: Follow the instructions for your chosen IDE to add ESP32 board support. This typically involves adding a board manager URL ໃນການຕັ້ງຄ່າ Arduino IDE.
3. Install Necessary Libraries: Depending on your project, you may need to install libraries for the SIM800L module (e.g., TinyGSM) and other peripherals.
4. ເລືອກກະດານ: In your IDE, select the appropriate ESP32 board (e.g., "ESP32 Dev Module" or similar, often requiring specific settings for flash size).

5. ຄໍາແນະນໍາການດໍາເນີນງານ

Once your development environment is set up and the hardware is connected, you can begin programming and operating your TTGO T-Call V1.4 board.

5.1 ການດໍາເນີນງານພື້ນຖານ

• ເປີດ: The board powers on automatically when connected via USB-C or when a charged battery is connected.
• ການຂຽນໂປຣແກຣມ: Upload your code to the ESP32 using the USB-C connection and your chosen IDE.
• Serial Monitor: Use the serial monitor in your IDE to view ແກ້ໄຂຂໍ້ຜິດພາດຂອງຂໍ້ຄວາມ ແລະ ພົວພັນກັບໂປຣແກຣມຂອງທ່ານ.

5.2 Using Wi-Fi and Bluetooth

The ESP32 module allows you to connect to Wi-Fi networks and communicate via Bluetooth. Refer to standard ESP32 programming examples and documentation for detailed usage of these features.

5.3 Using SIM800L (GSM/GPRS)

The SIM800L module provides cellular connectivity. You can use it for:

• ໂທອອກ/ຮັບສາຍ: Requires external speaker and microphone connected to the appropriate pins (SPK+, SPK-, MIC+, MIC- as shown in the pinout).
• Sending/Receiving SMS: Programmatically send and receive text messages.
• GPRS Data: Establish internet connections over the 2G cellular network for data transmission.

Specific libraries (e.g., TinyGSM) are available to simplify interaction with the SIM800L module via AT commands.

6. ບໍາລຸງຮັກສາ

• ການເກັບຮັກສາ: Store the board in a dry, anti-static environment when not in use.
• ການຈັດການ: Handle the board by its edges to avoid touching components, especially sensitive ones, to prevent electrostatic discharge (ESD) damage.
• ທໍາຄວາມສະອາດ: If necessary, gently clean the board with a soft, dry brush or compressed air. Avoid using liquids.
• ການອັບເດດເຟີມແວ: Regularly check for and apply firmware updates for the ESP32 and SIM800L modules to ensure optimal performance and security.

7. ການແກ້ໄຂບັນຫາ

• ບອດບໍ່ໄດ້ເປີດ:
  • Ensure the USB-C cable is securely connected and providing power.
  • If using a battery, ensure it is charged and correctly connected to the JST 2-pin connector.
• ບໍ່ສາມາດອັບໂຫລດລະຫັດໄດ້:
  • Verify that the correct board and COM port are selected in your IDE.
  • Check USB-C cable for damage.
  • Ensure necessary drivers are installed for the USB-to-serial converter.
• SIM800L Not Registering to Network:
  • Ensure the Nano SIM card is correctly inserted and active.
  • Verify the SIM antenna is securely connected.
  • Check cellular signal strength in your location.
  • Confirm your code correctly initializes and communicates with the SIM800L module.
• ບັນຫາການເຊື່ອມຕໍ່ Wi-Fi/Bluetooth:
  • Check your code for correct Wi-Fi credentials or Bluetooth pairing procedures.
  • Ensure the ESP32's internal antenna is not obstructed.

8. ຄໍາແນະນໍາຜູ້ໃຊ້

• Refer to Online Resources: The ESP32 and SIM800L modules have extensive online communities and documentation. Utilize these resources for example code, advanced tutorials, and troubleshooting specific issues.
• ການຄຸ້ມຄອງພະລັງງານ: When running on battery, optimize your code for low power consumption, especially for deep sleep modes, to extend battery life.
• ການວາງເສົາອາກາດ: For best cellular signal, ensure the SIM antenna is placed in an open area, away from metal obstructions.

9. ການຮັບປະກັນແລະການສະຫນັບສະຫນູນ

For technical support, troubleshooting assistance, or warranty inquiries, please contact the seller or manufacturer directly. Provide your product model (TTGO T-Call V1.4) and a detailed description of the issue to facilitate a quicker resolution.