Arduino Bluetooth wireless serial pass-through serial communication module HC-06 Bluetooth module from the machine 1, the core module HC-06 from the module, leads to interface includes VCC, GND, TXD, RXD, reserve LED status output pin, the microcontroller via the foot state to determine whether Bluetooth is connected, KEY pin slave invalid 2, led indicating Bluetooth connection status, flashing that there is no Bluetooth connectivity, lit indicates that Bluetooth is connected and turned on port 3, bottom 3.3V LDO, input voltage 3.6 ~ 6V, when the unpaired current of about 30mA, paired about 10mA, the input voltage to prohibit more than 7V! 4, the interface level 3.3V, can be directly connected to various SCM (51, AVR, PIC, ARM, MSP430, etc.), 5V microcontroller can also be directly connected, can not pass without MAX232 MAX232! 5, open to the effective distance of 10 meters, over 10 meters are possible, but do not do this to ensure the quality of the connection from the 6, after the pair when full-duplex serial interface, without having to know any Bluetooth protocol, but only supports 8 data bits, 1 stop bit, no parity communication format, which is the most commonly used communication format does not support other formats. 7, when no Bluetooth connection support setting the baud rate, name, passkey via AT commands, power-down save parameter settings. After Bluetooth connection is automatically switched to transparent mode 8, compact (3.57cm * 1.52cm), factory chip production to ensure the placement quality. And set transparent shrink tube, dust and beautiful, and there is a certain anti-static capabilities. 9, the link from the machine