This is my first time to participate in the Lichuang eda training camp. First of all, I would like to thank Lichuang for the strong support of the sample coupons and device coupons! ! ! Thank you to the teachers from Chuanzhi Education for answering your questions! ! !

Save money:

For this training camp

• All peripherals are independently driven by the HI3861 module, and no other microcontrollers are used to cheat or assist in calculation processing.
  
• I have a new understanding of Hongmeng and a deeper understanding of how to quickly get started with a new microcontroller and operating system, which has benefited a lot.
  
• I systematically studied Solid Works 21 and learned about product-level modeling.
  
• In order to facilitate everyone's learning and verification, I directly put my app directory and all test firmware open source in the attachment to facilitate everyone's secondary development and learning.
  

The following will explain the circuit part and software part:

Circuit part

Development board introduction:

Some "highlights":

•       Lead out the io7 pin of the module and connect it to the LED as the onboard lighting (giving life) pin. Because it is also the module PWM0 pin, it can also be used as a breathing light, etc.;
  
•       By connecting the power indicator light and the RST pin together, you can clearly know whether RST is pressed and whether the module en is pulled high. During debugging, you can rule out whether the module is burned out;
  
•       The downloader is isolated from the motherboard, and the two are connected through a jumper cap. They can be burned to other development boards, saving social resources and development costs (money), or cut out and used alone;
  
•       In order to prevent the button from being accidentally touched on the outside of the board, the RST button is placed within the frame, and the edge of the board is concave at the button (referring to the design of the TI development board), making it convenient, precise and comfortable to press;
  
•       The module has all pins out (pins/sockets), pca9685 has all pins out (standard servo three-wire slot), 3v3/5v/vusb full voltage leads out, and a 0.96 OLED screen IIC interface is reserved.
  
•       The silk screen is clear, the annotations are detailed, and the design is exquisite.
  

Suggestions for Improvement:

Question 1: Don’t know the battery power?

•      TP5100 (Taught in Jixin Classroom, if you don’t understand, you can take a look at the course at Station B, it’s very good!)
  
•      12v input, charging 7.4v battery, you also need to buy a 12v/dc port charger. It is not suitable for beginners, it is better to just buy a battery charger and pass it on.
  
•      3.7v power supply, chip 3.3v requires ldo, servo 5v requires dcdc, and charge and discharge management circuit, which is not very friendly to novices.
  

Question 2: Why not design other sensors onto the board?