Voltage and current meter based on CW32F030C8T6

Project Overview:
This project is designed based on the official example, reducing the size and adding timeout sleep alarm and vibration wake-up.
Project Functionality:
This design is a voltage and current meter based on the CW32F030C8T6 microcontroller; it has four independent buttons and can measure voltage in the 0-30V range and current in the 0-3A range.
Hardware Instructions:
Shorten the pin headers and solder them onto the CW32. Solder other components
on top , soldering the CW32 last (a lesson learned the hard way). Pay attention to the positive and negative terminals of the button battery holder.
Solder the OLED pin headers first, then solder the OLED, and
finally solder the CW32
. Shorten the boot pins and solder them together.
Attach the model buttons to the buttons .
Shorten the length of the toggle switch and
assemble it flush with the panel. The complete assembly is shown in the image. The design wasn't fully considered; there weren't enough DuPont wire connectors, so they were directly soldered onto the board.
Software
Code: The code uses the official example, only modifying the pins to add automatic sleep alarm and vibration wake-up.
Video Demonstration: