Need to support IOS, Android (no limit system version number), Windows system, please choose XM-26B Bluetooth 4.1 dual mode serial port module
Bluetooth module <===> MCU CE/CLR <===> MCU-GPIO can be disconnected (module power switch, high-on, low-off, built-in pull-up resistor, can be left floating) VCC <===> External power supply (3.0~6V) GND <===> GND is connected to the GND of the microcontroller TXD <===> MCU-RX MCU UART data receiving pin RXD <===> MCU-TX MCU UART data send pin (compatible with 3/3.3/5V) STATE <===> MCU-GPIO can not be connected (used to judge the current module running status, the same as the LED display) Note: The state of the XM-15B module operation (STATE), 1 jump: the module is in search or waiting to be connected 2 fixed high (LED is always on): has established a connection with the pairing module ? 3 fixed low (LED does not light): shutdown
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