Wi-Fi & Bluetooth LE MCU Board (WBR3)

The Tuya Sandwich Wi-Fi and Bluetooth LE combo wireless communication board has a WBR3 chip as a microcontroller, which is designed to help you easily prototype your IoT ideas. It can work with functional boards or circuit boards to implement specific features.

Applications

• This board applies to a wide range of prototypes implemented with Tuya’s custom solutions, such as lights, dimmers, remote controls for lights, power strips, switches, home appliances, sensors, and much more.
• Develop with the board to build your IoT projects easily and fast.
• You can use this board for different development purposes.
  • Embedded program development and debugging
  • App development and debugging
  • Creating connected devices that can be controlled with a mobile phone
  • Getting started with IoT development and learning how the Wi-Fi-based control system works

Components

The development board is integrated with Tuya’s proprietary high-performance Wi-Fi and Bluetooth LE combo module WBR3. It has on-board buttons, LED, and more. For more information, see the WBR3 Module Datasheet.

I/O port and pin description

• 1: LED indicator (LED1): When GPIOA_2 outputs high, the LED is on.

• 2: LED indicator (LED2): When the 3.3V power is on, the LED is on.

• 3: Button (SW1): Module’s enable pin that is active low. When the button is pressed, the pin outputs low.

• Pin description

  No.	Symbol	Description
  1	NC	Leave it floating.
  2	NC	Leave it floating.
  3	NC	Leave it floating.
  4	3V3	3.3V power pin.
  5	NC	Leave it floating.
  6	GND	Ground pin.
  7	GND	Ground pin.
  8	NC	Leave it floating.
  9	NC	Leave it floating.
  10	NC	Leave it floating.
  11	NC	Leave it floating.
  12	NC	Leave it floating.
  13	NC	Leave it floating.
  14	NC	Leave it floating.
  15	TXD	GPIOA_14, which can be reused as the UART0_TXD pin for serial communication.
  16	RXD	GPIOA_13, which can be reused as the UART0_RXD pin for serial communication.
  17	NC	Leave it floating.
  18	NC	Leave it floating.
  19	NC	Leave it floating.
  20	NC	Leave it floating.
  21	NC	Leave it floating.
  22	NC	Leave it floating.
  23	NC	Leave it floating.
  24	NC	Leave it floating.
  25	NC	Leave it floating.
  26	NC	Leave it floating.
  27	NC	Leave it floating.
  28	NC	Leave it floating.
  29	GND	Ground pin.
  30	NC	Leave it floating.
  31	NC	Leave it floating.
  32	NC	Leave it floating.

• The reserved pin
  You can use the reserved pin for license activation, firmware updates, or log printing.

  No.	Symbol	Description
  1	RXD	GPIOA_13, which can be reused as the UART0_RXD pin to activate the license.
  2	TXD	GPIOA_14, which can be reused as the UART0_TXD pin to activate the license.
  3	GND	Ground pin.
  4	3.3V	3.3V power pin.
  5	LOG	The pin for log printing.
  6	RST	Module’s enable pin that is active low.

Power requirements

• Power is input through the 3.3V pin. The operating voltage is from 3.0V to 3.6V.

• Consumption

  Mode	Status (Ta = 25°C)	Average	Peak	Unit
  Pairing in EZ mode	The module is being paired in EZ mode.	75	324	mA
  Idle mode	The module is connected to the internet.	64	314	mA
  Working mode	The module is connected to the internet.	66	305	mA
  Disconnected mode	The module is disconnected from the internet.	66	309	mA

Schematic diagram and PCB

• The schematic diagram of the board:

  

• The PCB board:

  

Connection for flashing

For flashing license and firmware, connect pins following the table and figure shown below.

Connection for viewing logs

For flashing license and firmware, connect pins following the table and figure shown below.

Things to note

• This board does not have a built-in power supply, so an additional power board is necessary.
• This board only supports 3.3V input voltage with a supply current of at least 350 mA.