CV engineer keyboard training

1. Project Introduction
      This project is the first Lichuang DA training in 2023, allowing freshmen to lay out and route denser circuits through a small PCB. Through continuous practice, learn how to plan the layout, design the peripheral circuit of the microcontroller, understand the role and value of the pull-up resistor, etc.
2.
       Due to the large number of participants in the project design, high-cost chips such as ESP32 could not be used. Instead, CH552G single-chip microcomputer was used instead of using other products. The peripheral circuit is relatively simple, and the diode design in RGB allows freshmen to understand how to use different components to limit current and reduce voltage. Of course, if any readers use this design, they can replace SS34 with a 0 ohm resistor and reasonably calculate the value of resistor R4. Just the resistance value.