I had just come into contact with electronics-related knowledge and wanted to make a keyboard for myself, so I bought a few STM32F103CBT6. I thought that if I only made one keyboard, the chip would be wasted, so I came up with the idea of making a minimal system board, with all the pins exposed, and it could be used for other purposes (although I have only made one keyboard so far). The m.2 interface was chosen simply because the interface is small enough and looks more refined.
Since I did not have any knowledge about circuits or EDA drawing when I drew this circuit diagram, I only installed it on my own keyboard and used it successfully, so if there are any problems with the drawing, you can teach me (
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