Tips:Our Most modules provide only DESCRIPTION or send data, there is no technical advisory support, please carefully shot beginners.Wireless Bluetooth serial module wireless serial communications pass through HC-06 Bluetooth module from the machine Information, please contact customer service.Special attention; the following are incorrect connection methods: Following is not a quality problem, wiring errors are excluded from the warranty will not be returned: 1, since the resumption of spontaneous test was successful, resulting in the use of land with TXD or RXD shorts 2, the module power supply leads to damage of reverseThis module is as exports, students and electronic enthusiasts purchase this module needs to consider clear that this can not retreat can not change, not to say that when burned our quality problems to return or exchange goods, and before shipping all have a good test Product Features: 1, the core module from the module using HC-06, leads interface includes VCC, GND, TXD, RXD, reserve LED status output pin, the microcontroller can be connected via Bluetooth to determine whether the state of the pin, KEY pin slave invalid 2, led indicate Bluetooth connection status, flashes to indicate no Bluetooth connectivity, steady indicates that Bluetooth is connected and open ports 3, bottom 3.3V LDO, input voltage 3.6 ~ 6V, when unpaired current of about 30mA, after the pair about 10mA, the input voltage must not exceed 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, it 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 distance 6, after the pair when full-duplex serial port to use, without having to know any Bluetooth protocol, but only supports 8 data bits, 1 stop bit, no parity communication format, which is the most common form of communication, not support other formats . 7. Set up a Bluetooth connection when not support setting the baud rate, name, passkey through AT commands, power-down save parameter settings. After the Bluetooth connection is automatically switched to transparent mode 8, compact (3.57cm * 1.52cm), factory chip production, quality assurance patch. And sets of transparent heat shrink tubing, dust and beautiful, and there is a certain anti-static capabilities. TXD: the sender, usually expressed as their transmitter, normal communication RXD must be connected to another device. RXD: the receiving end, generally expressed as himself on the receiving end, normal communication TXD must connect to another device. When normal communication itself TXD RXD forever connected devices! Since the resumption of spontaneous: RXD normal communication interface to other devices TXD, so if you want to receive data sent by itself as the name suggests, is to receive the data they send their own, that is directly connected to its own TXD RXD, used to send and receive the test itself is normal, is the quickest and easiest way to test when a problem occurs first do this test to determine whether a product failure. Also known as the loopback test.