Replica Ammeter and Voltmeter

I. Design Background
: This is a beginner's guide to replicating a training camp project, using the CW32F030 development board as the main controller to create a usable voltage and current meter.
II. Usage:
When using this replicated project, you can first enter the voltage and current calibration mode via a button. The meter can then be calibrated using a calibration board or other methods. The calibration mode supports voltage values ​​of 5.05V and 5.15V, and current values ​​of 0.5A and 1.5A.
After calibration, the meter can be used for measurements.
Power Supply: Supports 12V external power, USB-type C power, and serial port power during download. During testing, the measurement results were consistent and stable across all three power supply modes. However, since the casing may obstruct the USB-C port, 12V external power is the primary power source.
To ensure measurement accuracy and stable readings, a mean filter is used for tuning. This stabilizes the voltage and current values ​​of the measured circuit. Without a mean filter, the voltage will display 0.23-0.24V with significant fluctuations.
III. Reproduction Experience
During this reproduction process, I became more proficient in soldering, which is a significant achievement for someone new to this field. At the same time, I gained a better understanding of details in PCB design, such as widening power lines, adding reinforcing plates, and choosing copper pouring methods.
However, the most important gain, in my opinion, is the experience of participating in a project from start to finish. This will make my subsequent design and creation much easier.