The minimum system board adopts a direct plug-in method, and the pin headers on both sides are together. The minimum systems on the market now are all rectangular, which sometimes takes up a lot of space when placed on the board, and there is no external expansion screen. This smallest system board I have not only has an expanded screen, but also has common interfaces for OLED and 1.14-inch LCD, and it only occupies two rows of pins. It is very compact.
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