Tuya Sandwich Bluetooth SoC Board (BT3L)

Tuya Sandwich Bluetooth SoC master control board (BT3L) helps you quickly implement various smart hardware prototypes. You can use the Tuya Sandwich Bluetooth SoC master control board (BT3L) with other functional circuit modules or circuit boards to implement corresponding functions.

Scenarios

• The Tuya Sandwich Bluetooth SoC master control board (BT3L) applies to many prototypes developed by Tuya IoT plug-and-play solutions, including sockets, power strips, and switches.

• You also can implement diversified smart hardware demos with this development board.

• The common scenarios of the Tuya Bluetooth SoC master control 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 the 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 SoC master control board (BT3L) adopts the high-performance Bluetooth module BT3L developed by Tuya Smart. The development board contains Bluetooth module BT3L, buttons, LED indicators, user-defined I/O interfaces, power supply, and more. For more information, see BT3L Module Datasheet.

I/O ports and function definitions

• CN5 serial port for UART upgrade: Used for system upgrade and debugging.

• LED indicator LED1: 3.3V power indicator.

• LED indicator LED2: 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_D7. Its logic level is high when initialized and is low when pressed.

• Other GPIO ports: You can customize their functions. See the following table.

  No.	Symbol	Description
  1	RST	I/O. The hardware reset pin, which is active low.
  2	3V3	3.3V power input pin.
  3	GND	Power ground.
  4	ADC	12-bit analog ADC input.
  5	TL_B7/RX	Serial port receiving pin UART_RX.
  6	TL_B1/TX	Serial port receiving pin UART_TX.
  7	TL_C3	I/O. It can be used as an LED driver or PWM output pin.
  8	TL_B5	I/O. It can be used as an LED driver or PWM output pin.
  9	TL_D2	I/O. It can be used as an LED driver or PWM output pin.
  10	TL_D7	GPIO, pulled up.
  11	TL_C0	GPIO.
  12	TL_C2	I/O. It can be used as an LED driver or PWM output pin.
  13	TL_A0	GPIO.
  14	TL_B4	I/O. It can be used as an LED driver or PWM output pin.

Schematic diagram and PCB

• Schematic diagram of Tuya Sandwich Bluetooth SoC master control board (BT3L):

  

• PCB of Tuya Sandwich Bluetooth SoC master control board (BT3L):

  

Things to note

• The development board in this solution must be used with a power board.
• The development board in this solution only supports 3.3V power input, and the supply current is not less than 100mA.