Last Updated on : 2022-10-26 06:59:47
The Tuya Sandwich Wi-Fi and Bluetooth Low Energy (LE) combo SoC has Tuya’s WBRU network module 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.
The development board is integrated with Tuya’s proprietary low-power Wi-Fi and Bluetooth LE combo module WBRU. This module consists of a highly integrated wireless chip W701-VA2-CG with built-in Wi-Fi stacks and various library functions. The development board has on-board buttons, LED, GPIOs, and a USB-to-serial chip. For more information, see the WBRU Module Datasheet.
1: Micro-USB (CN1): Inputs 5V DC voltage and provides two extended serial ports.
2: DIP switch (S1): Flip the toggle to the ON position to complete the circuit. The switch is used to open and close the circuit between the USB-to-serial chip and the chip’s serial port.
3: LED indicator (D3): When the 3.3V power is on, the LED is on.
4: Button (S2): When the button is pressed, PA12 outputs low. When the button is released, it outputs high.
5: LED indicator (D2): When PA18 outputs low, the LED is on.
6: Button (RST): When the button is pressed, the module is reset.
|1||NC||Leave it floating.|
|2||3.3V||3.3V power pin.|
|3||NC||Leave it floating.|
|4||NC||Leave it floating.|
|5||NC||Leave it floating.|
|12||5V||5V power pin.|
|13||RST||Clock enable (CEN) pin on WBRU. It can output the chip enable and high enable signals.|
|15||NC||Leave it floating.|
|18||RST||Clock enable (CEN) pin on WBRU. It can output the high enable signal.|
|30||NC||Leave it floating.|
When micro-USB (CN1) inputs 5V DC voltage, the board can supply power to external components.
|Power pin||Rated voltage/current|
|5V||Depends on the input current of the adapter connected to the DC-005 terminal.|
Characteristics of output voltage
We tested the voltage under the condition that there is no output voltage on the micro-USB (CN1) terminal.
The schematic diagram of the board:
The PCB board:
The board has a built-in USB-to-serial chip. The single-channel USB port can provide two extended serial ports. You can flip the DIP switch (SW1) to enable the 2-channel serial port on the WBRU to connect to the USB-to-serial chip. The following table lists the pin definition of the DIP switch.
|DIP switch No.||1||2||3||4|
The COM ports map to the UART pins as follows.
|COM ports on the computer||SERIAL-A(COM23)||SERIAL-B(COM22)|
The COM port number varies depending on computers so we use
SERIAL-B to indicate the two COM ports.
If you use Tuya’s software for firmware flashing and module authorization, flip the toggles of channels 1 and 2 on the DIP switch (SW1) to the ON position to complete the circuit between the UART1 on WBRU and the host.
The development board comes with pre-flashed firmware. In this mode, pre-flashed firmware is run.
If you use the chip manufacturer’s software for firmware flashing, flip the toggles of channels 3 and 4 on the DIP switch (SW1) to the ON position to complete the circuit between the UART2 on WBRU and the host. Connect PA0 and PA13 to the 3.3V pin.
The chip manufacturer’s software can only be used to flash firmware to the module. You need to use Tuya’s software to authorize the module.
If you flash the firmware to the module at a specified address, authorizing the module again is not needed.
Flip the toggles of channel 3 and 4 on the DIP switch (SW1) to the ON position to complete the circuit between the UART2 on WBRU and the host.
Flip the toggles of channel 1 and 2 on the DIP switch (SW1) to the ON position to complete the circuit between the UART1 on WBRU and the host.
Flip the toggles of channel 1 to 4 on the DIP switch (SW1) to the OFF position to open the circuit between the UARTs on WBRU and the USB-to-serial chip.
Download the USB-to-serial chip driver for your operating system.
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