Hc-05 Bluetooth module debugging slave mode and master mode experience

HC-05 Bluetooth module debugging slave mode and master mode experience

The boards obtained are as follows , I want to realize that Bluetooth module can be used as master station or slave station ,

 

I have no previous experience in Bluetooth debugging （ A little white ）, Get it from the manufacturer AT Instructions and Bluetooth test software .exe, With a vacant face , What is all this , Read it over and over again AT Instruction set , The meaning of each instruction is clear , But I don't know the sending order of each instruction , I don't know which instructions should be called in main mode , What should be called from the mode , Although very confused , But be positive , If it's not good, I still have Du Niang , Begin your search .............

First page , Too deep , Do not understand

Second page , Still in the clouds

Third page , Know how to connect

.......

The first n Pages , Take care of my little white , Write clearly step by step hand , Although it is just a simple slave configuration and connection , It is also a step closer to success . Try it first ,

 

10 Minutes later, according to the configuration of the web page , Set up the success , Both mobile phones and computers can search for Bluetooth modules , Excited , The first step of the long march has been completed , The rest is more troublesome , I not only want to realize the slave station , Also realize the master station , Search again ,99% All of them are similar helloworld Of , Only the configuration of the slave , There are few main stations or according to mac Address bound , Not what I want , Lost again .

 

Calm down and analyze , Online things are also written according to official documents , Only by growing your own food can you have endless dishes , To analyze AT Instruction set , Try bit by bit

In half an hour , At last , You can send data to the Bluetooth module through the serial port tool , Connect to Bluetooth printer , Print out the data , Both Chinese and English are ok .

 

Think about your debugging experience , It also refers to a lot of materials , Now I decide to sort it out for the reference of friends who need it .

Don't spray

 

 

 

 

 

Using tools ：TTL turn usb modular

Serial assistant uses sscom3.2

 

Wiring way ：   Bluetooth and USB Connection mode of serial port module ,RXD-TX TXD-RX VCC-VCC GND-GND

 

The default parameters of the module are as follows ：

 

 

test AT Instructions ：

1、 How to access Bluetooth AT Pattern ：HC－０５ You need to press and hold the button in the upper left corner of the module , And then power on , Let a pin go through the process of turning a high-level platform into a low-level , You can enter AT Instruction setting mode . At the same time, pay attention to the actual HC05 In the process of purchase , Some businesses will directly put some HC-05 Sold as a slave , So some HC05 The module has no welding button , So we can weld the buttons by ourselves , Or use conductive objects （ DuPont line 、 Tweezers ）, Set that pin high . about HC05 Come on , The flash of the module indicator indicates that Bluetooth is not connected , Slow flashing indicates entering AT Pattern , Double flashing indicates that Bluetooth is connected and the port is opened .

Ps: If the board is like the board I bought , You can also enter AT Pattern , Press the button on the Bluetooth module to enter AT Pattern , Release and enter the communication mode .

2、 Turn on the serial assistant , Select the correct port number .

3、 Set up AT It needs to be set under the fixed initial baud rate specified by the module （HC05 by 38400）, Some Bluetooth modules need to be carried out at the baud rate you set last AT Sending instructions .

4、 Some modules are sending AT When the command , It needs to be written in the sending area AT Add carriage return after the instruction "\ｒ\n", At the same time, pay attention to case sensitivity .

5、 What are the details AT Instructions and their meanings need to refer to the 《AT Instruction set 》

Slave configuration ：

Press key Then power on the Bluetooth module , The computer software is set

The setting is as shown in the figure ：

 

If sent AT There was no response after the order , Press new key Access to electricity .

 

The computer can be installed BluetoothView.exe It is convenient to check whether the Bluetooth module is working .

 

 

Instruction, （ You can refer to AT The instruction set is very detailed ）：

AT： Test instruction , return OK Indicates that the communication is successful
AT+PSWD=1234： Set up Bluetooth pairing password
AT+PSWD？： Query whether the setting is successful
AT+NAME=Bluetooth-Slave ： Set the Bluetooth display name , It can be set arbitrarily, but it cannot exceed 20 character

AT+ROLE=0： Set the Bluetooth module as a slave ,

 

AT+UART=38400,0,0   Set the baud rate of Bluetooth in working mode , And modules in AT Baud rate in mode is two different things . It is recommended to set the same during debugging , In this way, there is no need to frequently switch the baud rate of the serial port tool .

 

Set the configuration information of the master station

Pictured

 

 

1、 Detailed explanation of main instructions

AT+ROLE=1   

AT+CMODE=0/1 （ I used it for the test 0 Is connected before , It is recommended to use 1）

AT+CMODE=0 Need to cooperate with AT+bind Use it together

 

 

AT+INIT   initialization SPP Specification Library , As the master station, it must be initialized once , Otherwise, in the perform at+inqm=1,10,15   and at+inq Or return error(16)   mean spp Library not initialized .

AT+pair and AT+link It's pairing and connecting

here The master-slave pairing has been completed, and the Bluetooth module is also slave AT The mode is switched to normal mode even if you press key Button （pio10 For the high ）

If you want to disconnect Need to press again key Button , send out AT+DISC.

 

 

Add two instructions ：

AT+CLASS=0    I use the default , The usage scenario of Bluetooth module represented by this instruction , See instruction set for details , through AT+class Modify the device class of the module , in other words If the module is modified to 0x1f1f, Then the main module can only search class by 0x1f1f From the station

 

 

AT+iac

 

 

AT+iac The default is 0x9e8b33, This code is a general access code , It can be changed to any value ,

The main function is filtering , The master station can only query the same as itself iac Yard slave station .