USB to serial port monitor

Serial port debugging has always been a fundamental debugging method for engineers. Previously, I used USB-to-TTL modules bought from Taobao, but a major drawback was that most used microUSB interfaces, which are not compatible with the ubiquitous Type-C cables. I had to search for a USB cable every time I needed to use it. The most unacceptable aspect was the inevitable risk of damaging the module if the communication line was connected incorrectly or the TTL level was incompatible. Fortunately, LCSC released EDA software that I hadn't used before, so I took this opportunity to familiarize myself with it and build a USB-to-TTL module that met my needs.
Module Functions:
1. USB Type-C interface
; 2. Communication TXD and RXD compatible with 3.3V-12V levels
; 3. Module can be powered externally, selectable via DIP switch: no power supply, 3.3V power supply, 5V power supply;
4. Communication status indicator light
. Note: The silkscreened TXD and RXD on the module correspond to the remote TXD and RXD, not the module's TXD and RXD. That is, the microcontroller's TXD connects to the module's TXD, and the microcontroller's RXD connects to the module's RXD.