HC-05 Description
+5V Function Connect to +5V Ground Connect to Ground UART_TXD, Bluetooth serial signal sending PIN Connect with the MCU’s (Microcontroller and etc) RXD PIN. UART_RXD, Bluetooth serial signal receiving PIN Connect with the MCU’s (Microcontroller and etc) TXD PIN. Mode switch input If it is input low level or connect to the air, the module is at paired or munication mode.