Single chip Bluetooth wireless burning

One 、  Why do I need Bluetooth wireless burning

      When we put the SCM development board 、 Or install the self-made system board on the equipment , You always have to drag a long line to re burn USB Line , Especially for some development boards , for example Arduino pro mini This one doesn't USB to TTL Development board , It is necessary to pull several DuPont lines for burning , We will also face the problem of poor contact , Especially troublesome . therefore , Use a piece of HC-05 perhaps HC-06 Realize Bluetooth communication at the same time , It can also realize stable burning , Isn't it a happy thing .

        Learn before Arduino I learned this article when burning Bluetooth ： Upload wirelessly through Bluetooth module Arduino Program

       

        But the method of this article is the same as Arduino Pro Mini The burning method is the same ( Don't use DTR), Manual reset is required , Make the single chip microcomputer enter BL, Compile simple programs, and you can wait beside them to start uploading , Then press the reset button , Successfully burned .  

however ！！！！

        If the project is relatively large （Arduino IDE The compilation is notoriously slow ） The program , If you compile for a few minutes , You see , Missed the moment , A cool song for you . therefore , When carrying Liangliang down , Made the automatic burning thing .

Two 、 How to realize Bluetooth wireless burning

          The general process of wireless burning is , Connection detected , Reset the MCU , Forward computer data and MCU data interaction , Finish burning .

The following is the basic knowledge to understand the working principle of the system ：

        （1） about Arduino IDE（ Never tested , Not sure Windows Is the Bluetooth serial port under open and then connected to Bluetooth or ）, Use serial port monitor or burn , Will disconnect Bluetooth , Reconnect , send out / receive data , That's important , The principle of this circuit is to connect Bluetooth when burning , Bluetooth module connection instructions for burning .

         （2） The capacitor has the function of isolating DC and AC , The reset of single chip microcomputer requires a high （ low ） Level pulse to reset , If you keep raising （ Pull it down ） MCU reset pin , Then the single chip microcomputer cannot work normally . therefore , It is particularly important to use capacitors to convert continuous level signals into single pulse signals .

          （3） The Bluetooth transparent module can send the serial port data of the computer according to the baud rate set by the module , The kind that doesn't move .

3、 ... and 、 Materials needed

（1）HC-05\06 A piece of

（2）S8050 One

（3）104 One capacitor （ If onboard DTR Pin , You can use this capacitor ）

（4）1K resistance 2 individual

（5） Connect several wires 、 A bread board （ How to connect the eight immortals to cross the sea shows their magic powers ）

Four 、 Schematic diagram

       

Simple schematic diagram   

 

5、 ... and 、 Specific operation

（1） Set the Bluetooth module ： The Bluetooth module setup process is very simple , Just set the corresponding baud rate , Set the baud rate to and the development board BL The required baud rate is the same Just go .

Here's the part Arduino Baud rate setting reference
UNO、MEGA2560：115200
atmega328：57600
atmega168,atmega8 ：19200

The specific operation is , Press and hold the Bluetooth module EN Button , Use USB turn TTL Connecting to a computer , Use serial port monitor baud rate 38400 send out AT return AT It indicates that you have successfully entered AT Pattern , Need to use AT Instructions for ：

AT+UART=115200,1,2

（2） Build the circuit ： There's nothing to say about this part , Just follow the schematic diagram and finish it .

（3） Connect the computer with Bluetooth ： Turn on the computer Bluetooth , Search Bluetooth module （ Power on the Bluetooth module ）, Enter the pairing code （ No 0000, Namely 1234）, Then click “ More Bluetooth options ”,COM port , Remember that the direction is outgoing COM Number ,Arduino Or other software can use this string of slogans to communicate .

6、 ... and 、 demonstration

Because I didn't understand the functions of components thoroughly when I was young , Made a complicated circuit , The circuit in the video can also be used , It's just too complicated

Old demo video