Tuya Sandwich Bluetooth MCU Board

The Tuya Sandwich Bluetooth Low Energy (LE) MCU communication board (BT3L) helps you quickly implement various smart hardware prototypes. You can use the Tuya Sandwich Bluetooth LE MCU communication board (BT3L) with other MCU master control boards, or other MCU master control boards and their functional modules to implement corresponding functions.

Scenarios

• The Tuya Sandwich Bluetooth LE MCU communication board (BT3L) applies to many product prototypes developed by Tuya IoT custom solutions, including lighting, home appliances, exercise and health, sensors, sockets, power strips, scene light sockets, and wireless switches.

• You can use the development board to connect peripheral MCU master control platforms such as Arduino and ST development boards to quickly implement various smart hardware demos.

• The common scenarios of the Tuya Sandwich Bluetooth LE MCU communication board are as follows:

  • Embedded systems engineers can use the board to perform preliminary embedded programming and debugging.
  • App developers can use the board to develop and debug apps.
  • Makers can use the board to quickly implement hardware demos and device control with a mobile phone.
  • IoT technology enthusiasts can use the board to learn about the Bluetooth control principle and smart device development.

Introduction to key components

The Tuya Sandwich Bluetooth LE MCU communication board (BT3L) adopts the high-performance Bluetooth module BT3L developed by Tuya Smart. The development board contains Bluetooth module BT3L, buttons, LED indicators, UART interfaces, power supply, and more. Implement corresponding functions. For more information, see BT3L Module Datasheet.

I/O ports and function definitions

• CN6 serial port for UART upgrade: Mainly used for system upgrade and debugging.

• LED indicator LED1: You can customize its functions. The indicator is controlled by TL_A0 and is active high.

• Button SW1: You can customize its functions. It is detected by TL_C0. Its logical level is high when initialized and is low when pressed.

• Other GPIO ports: Serial ports and power ports. See the following table.

  No.	Symbol	Description
  1	3.3V	3.3V power input pin
  2	GND	Power ground
  9	TX	Serial port transmitting pin
  10	RX	Serial port receiving pin

Schematic diagram and PCB

• Schematic diagram of Tuya Sandwich Bluetooth LE MCU communication board (BT3L):

  

• PCB of Tuya Sandwich Bluetooth LE MCU communication board (BT3L):

  

Things to note

• The development board in this solution must be used with a power board and an MCU master control unit.
• The development board in this solution only supports 3.3V power input, and the supply current is greater than 200 mA.

Reference

• Demos

• Overview of the Tuya Sandwich Evaluation Kit