Pit avoidance: about the interconnection of two hc-05 master-slave integrated Bluetooth modules, there is no connection problem

matters needing attention ：
        One 、 First , Be sure to buy 6 Foot's HC-05 Master slave Bluetooth module , Because it is necessary to realize the interconnection of two Bluetooth , So one must be the host , A slave .

        Two 、 Next is the fixed configuration step , Basically, it operates like other blogs on the Internet .（ The first 9 Step needs to avoid the pit ）

1、【AT Pattern 】 Of two Bluetooth modules PIO11（ That is to say EN Pin ,HC-05 Yes 6 A foot ,HC-06 yes 4 individual ） Pick up VCC, Enter... After power on AT Command mode , Use both USB turn TTL The module is connected to the computer's USB Interface .（ If it is HC-05 Just press and hold the button on the Bluetooth module , If the red light flashes slowly, it means you have entered AT Pattern ）

2、【 Open the serial debugging assistant 】 Turn on 2 A serial port debugging window , One turns on Bluetooth A Of COM mouth , One turns on Bluetooth B Of COM mouth .【 The default baud rate is generally 38400】

3、【 recovery A default setting 】 Serial debugging assistant A, Bluetooth A Restore default settings ：AT+ORGL 【 Enter immediately 、 Line break , Enter a carriage return on the serial port debugging assistant 】

4、【 Set up A Pairing code 】 Serial debugging assistant A, Configure Bluetooth A Password ：AT+PSWD=0000 【 bluetooth A With Bluetooth B The password is the same , In order to successfully pair 】

5、【 Set up A Main mode 】 Serial debugging assistant A, Bluetooth A Configure to host mode ：AT+ROLE=1

6、【 recovery B default setting 】 Serial debugging assistant B, Bluetooth B Restore default settings ：AT+ORGL

7、【 Set up B Pairing code 】 Serial debugging assistant B, Configure Bluetooth B Password and Bluetooth A Agreement ：AT+PSWD=0000

8、【 Set up B Slave mode 】 Serial debugging assistant B, Bluetooth B Configured as slave mode ：AT+ROLE=0

The first 8 Skip directly to step 11 Step , Because after binding the address , There is metaphysics , Two Bluetooth cannot be interconnected , Let them automatically connect at will （ Don't worry about connecting to other modules , Because you have set the password , Other modules , He can't even connect , Only those with the same password ）

11、【 Normal operating mode 】2 Module PIO11 All pins are grounded , After power on again, enter the normal working mode , Automatically complete pairing . after , Serial debugging assistant A And serial port debugging assistant B You can transfer data to each other .

After two Bluetooth modules are configured , power failure , Three seconds after power on , It will automatically connect to , Then the flashing frequency of the continuous light is two times of continuous flashing and one time of slow flashing .