LiChuang Panel Printing | USB HUB CV Keyboard

Refer to
the design of https://oshwhub.com/pomin/diy-jian-pand, and modify the code based on it according to my own use. The WS2812 lighting effect is still the breathing light when pressing it.
There is a known bug at present. The board needs to be changed for the second burning of the microcontroller. This board cannot enter the secondary download mode.
The attachment gives the code and the panel in the shell EDA. It has been verified that the
crystal oscillator of SL2.1A adopts double stickers, active or passive.
Panel printing instructions: size 300mmx200mm, front printing 1.5mm thickness (the actual measured thickness of 1.5mm can make the axis just clamp the positioning plate), no back glue is required, the regular shading degree of the panel type depends on personal preference, I use transparent acrylic , the order address is https://dos.szlcsc.com/, and the text on my design drawing can also be modified by yourself. The attached physical picture PCB welding prompts to solder the back components first, the crystal oscillator is active or passive, remember not to solder both. The WS2812 lamp can only be soldered with a soldering iron or the entire back side on a heating table. Do not use an air gun. Do not solder the shaft from the front. Solder the shaft last. To be on the safe side, the two fixed corners of the encoder can also be left unsoldered first. Solder them after successful verification. When soldering the 16-corner TYPE-C, you can apply solder paste now, then put the TYPE-C on it, and use a soldering iron to drag solder. Do not use an air gun as it will melt it. When verifying the TYPE-A mother socket in the same way, use WCH ISP to burn the new chip, use tweezers instead of the shaft, and short-circuit the two corners of the shaft to realize the role of the shaft . When soldering the shaft, first clamp the shaft on the positioning plate, buckle it onto the PCB, and then solder it. PS: Wash the board before soldering the shaft. The shaft cannot touch the washing water or it will melt.