Digital Voltage and Current Meter Based on LCSC GeoStar CW32F030C8T6 Development Board

Project Documentation: CW32 Digital Voltage and Current Meter Training Camp Project Tutorial Documentation | LCSC Development Board Technical Documentation Center (lckfb.com)
Project Video Tutorial (Reference): https://www.bilibili.com/video/BV1mw4m1r7Er?vd_source=4854430abe179f511d7810db7297d7bd
 
This project uses ST-LINK to connect to the development board.
Software configuration selects the appropriate burning method.
 
Problems I encountered in the project (pitfalls) and optimization
pitfalls :
1. Environment:
Keil Community Edition download link: https://www.keil.arm.com/mdk-community/
Activation is only required under the website's guidance; no login is needed (I spent most of the day trying to log in and was still stuck on the login page).
2. Tolerance issue of the banana head :
Please pay close attention when drawing the banana head (the publicly available information may not be accurate; this is a lesson learned the hard way, and it has now been changed).
Note: The tolerance of the banana head in this project is an outer diameter of 7.5mm and a hole diameter of 4mm.
 
Optimization:
1. Resistor value optimization: The resistance value of R27 (originally 220K) can be changed to 200K for more accurate measurement and to save on components (R28 is also 200K).
 
Due to different wiring and component placement,
the placement of the digital tube is explained below (LD1 below, LD2 above).
The digital tube display reads from bottom to top.
 
Note:
JP2 must be shorted (connect the shorting cap).
Since I do not have an adjustable power supply, I can only adjust the potentiometer (R34), which is similar to changing the voltage division ratio to change the voltage value. The multimeter and digital tube change with the potentiometer rotation (verified).
The software needs to be modified (the uploaded version has been modified, original: 220).
If the program cannot be burned, please select the corresponding kernel. All compilation program warnings can be ignored.
If you still cannot download, please refer to the technical document, Software Design - 3.2 Development Environment Setup.
 
 
The video demonstration shows a six-digit display current channel for voltage acquisition and display (error is within a controllable range, normal (not yet calibrated - Experiment Nine)). (Starting from Experiment 8, an external adjustable voltage source is required (for measuring current (I-)), which has not yet been verified (the others have been verified - the main body is complete). Does anyone have recommendations?)
I'm a beginner, so please correct me if there are any problems. Thank you in advance. Please be careful when copying this!
I would also appreciate any valuable feedback from experts on my circuit design (it's really important to me). Thank you!