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1.1 Tips (Very important) : TXD: sending end, generally expressed as its own sending end, normal communication must be connected to the RXD of another device. RXD: receiving end, generally expressed as their own receiving end, normal communication must be connected to the TXD of another device. Normal communication when the TXD itself is always connected to the device RXD! Self-absorption: Normal communication TXD RXD connect other devices, so if you want to receive their data, as the name implies, is receiving themselves to send data, is directly connected to the RXD TXD itself, that is, used to test whether the sending and receiving of normal itself, is the most simple test method is the fastest, when problems arise first do this test to determine whether the product failure. Also known as loop testing. 1.2 Level logic: TTL level: usually the data is expressed in binary. It is specified that +5V is equivalent to logic "1" and 0V is equivalent to logic "0". It is called TTL signal system and positive logic RS232 level: adopt -12V to -3V, equivalent to logic "0", +3V to +12V logic level, equivalent to logic "1", is negative logic 1.3 Product Features: 1, the core module uses HC-05 from the module, the output interface includes VCC,GND,TXD,RXD,KEY pin, connection status pin (STATE), the output is low if not connected, the output is high after connected 2. Led indicates the connection status. Quick blinking means no? connection; slow blinking means AT mode; double blinking means? is connected and the port is opened The bottom plate is equipped with anti-reverse connection diode, with 3.3V LDO, the input voltage is 3.6-6V, the unpaired current is about 30mA, the paired current is about 10mA, the input voltage is prohibited to exceed 7V! 4, interface level 3.3V, can be directly connected to a variety of microcontroller (51, AVR, PIC, ARM, MSP430, etc.), 5V microcontroller can also be directly connected, without MAX232 can not go through MAX232! 5, open effective distanc