
Bluetooth module board with UART interface configured in slave (device) mode for accepting connections from a Bluetooth master.

Bluetooth module state/status output, visible on the official Waveshare product image header label.
UART receive input for the Bluetooth slave module, visible on the official Waveshare product image header label.
UART transmit output for the Bluetooth slave module, visible on the official Waveshare product image header label.
Ground reference for the module and host UART connection.
Power input for the Bluetooth slave UART board. The official product image marks 3.3V / 5V operation next to the header.
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| STATE | Header pin labelled STATE | Signal | Bluetooth module state/status output, visible on the official Waveshare product image header label. | 3.3V / 5V board power is marked on the official image; signal level follows the module interface. |
| RXD | Header pin labelled RXD | UART | UART receive input for the Bluetooth slave module, visible on the official Waveshare product image header label. | 3.3V / 5V board power is marked on the official image; UART level follows the module interface. |
| TXD | Header pin labelled TXD | UART | UART transmit output for the Bluetooth slave module, visible on the official Waveshare product image header label. | 3.3V / 5V board power is marked on the official image; UART level follows the module interface. |
| GND | Header pin labelled GND | Ground | Ground reference for the module and host UART connection. | 0V |
| VCC | Header pin labelled VCC | Power | Power input for the Bluetooth slave UART board. The official product image marks 3.3V / 5V operation next to the header. | 3.3V / 5V |
Bluetooth module state/status output, visible on the official Waveshare product image header label.
UART receive input for the Bluetooth slave module, visible on the official Waveshare product image header label.
UART transmit output for the Bluetooth slave module, visible on the official Waveshare product image header label.
Ground reference for the module and host UART connection.
Power input for the Bluetooth slave UART board. The official product image marks 3.3V / 5V operation next to the header.
UART · SPI · 3.3 V · 5 V · Breakout
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