Based on LCSC Diwenxing CW32 digital voltage and current meter

This project boasts several highlights:

It adopts a core board plus expansion board design concept and uses plug-in components, making learning simpler and exploration more in-depth.
The core board uses the domestic Wuhan Xinyuan Semiconductor CW32 as the main controller, while also being compatible with other similar development boards; however, the CW32 has advantages.
The project is highly comprehensive and practical, and after completion, it can be used as a desktop instrument for daily calibration .

 
Calibration Operation Method:
This example uses button operation for calibration. The specific operation method is as follows:
Define 5 working modes. The K1 key is used to switch display modes. The K2 key sets the parameter value for the corresponding mode and saves it to FLASH. The K3 key returns to mode 0.
Mode 0: Displays normal voltage and current values ​​(the upper row of digital tubes displays the voltage value *.V or .*V automatically switching, the lower row displays the current value _.**A).
Mode 1: Voltage 5V calibration value setting. The upper row of digital tubes displays 5.05. The lower row displays the current voltage value _.V or ._V. In this mode, the multimeter should be adjusted to 5.00V to measure the measured bit. Mode 1: Setting the voltage to 15V
. The top row of the digital display shows 5.15. The bottom row shows the current voltage value in _V or ._V. In this mode, the multimeter should be set to 15.0V to measure the measured value. Setting the voltage to 15V.
Mode 2: Setting the voltage to 0.5A. The top row of the digital display shows A.0.5. The bottom row shows the current current value in _.**A. Setting the voltage to 0.5A.
Mode 4: Setting the voltage to 1.5A. The top row of the digital display shows A.1.5. The bottom row shows the current current value in *.**A. Setting the voltage to 1.5A.
The official software design experiments can all be implemented, but I couldn't calibrate it because I don't have a multimeter at home. Without R0 soldered, the second row of the digital display showed a current value of 0.5 A in mode 0; after soldering R0, the current display showed zero. This was
my first time participating in the training camp, and I learned a lot. Thanks to JLCPCB and Sinyuan Semiconductor.
Official documentation link: https://wiki.lckfb.com/zh-hans/dwx-cw32f030c8t6/training/voltammeter-bootcamp/voltammeter.html