1.PCB Dimensions: 37.3mm (length) * 15.5mm (W) 

2 Weight:. 3.5g 

(3) Input voltage: 3.6V--6V, 7V ban over 

4 power anti-reverse, reverse module does not work 

5 leads to 6 feet: EN / VCC / GND / RXD / TXD / STATE (Bluetooth status leads to the foot, is not connected to the output low, after connecting output high) 

6 with the connection status indicator, LED flash means no Bluetooth connection; LED flashing slowly that enter the AT command mode 

7 onboard 3.3V regulator chip, the input voltage DC 3.6V-6V; When unpaired, current of about 30mA (because LED lights flashing, the current state of change); After successful pairing, the current is about 10mA 

8 Interface level 3.3V, you can directly connect a variety of microcontroller (/51/AVR/PIC/ARM/MSP430 etc.), 5V microcontroller can also be directly connected. Directly connected to the microcontroller serial port, not through the MAX232 chip! 

9 open area effective transmission distance of 10 meters, over 10 meters are possible, but do not guarantee the quality of the connection 

10. After successful pairing, can be used as a full-duplex serial port. Do not need to know anything about the Bluetooth protocol, but only supports 8 data bits, 1 stop bit, no parity communication format. This is the most common communication format that does not support other formats! 

11 Press the key to give the Bluetooth module is energized to enter AT mode, set parameters and query information 

12 can be switched master and slave mode via AT commands 

13 modules default baud rate is 9600, the default passkey is 1234, the default name for the HC-05 

14 protection with transparent shrink tube 

Second, wiring methods: 

VCC: positive power supply 

GND: power supply is negative 

RXD: Receive side, the Bluetooth module receives data sent to the other device; TXD terminal normally connected to the other device to send 

TXD: sending end, the Bluetooth module to send data to other devices; RXD terminal normally connected to other devices receiving 

EN: Enable, then you need to enter AT mode 3.3V
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