An arduino Leonardo powered numeric keypad. The following functions have been implemented so far: 0: Completely implemented by Arduino, using expansion board form, low implementation difficulty 1: Single-key backlight adjustable (WS2812) 2: Very few IO port occupation (this solution is different from the matrix keyboard, but uses Different arrangements and combinations of diodes for key reading and writing) 3: Multi-mode adjustment, including quick filling of basic operating functions such as C language and C++. 4: Rich scalability, you can write your own macros, control mouse and keyboard, etc., to realize some Bad USB functions. For the introduction video, please go to Station B https://www.bilibili.com/video/BV1br4y1N7UH. For the program source code, see the attachment below or github. https://github.com/Yu-Qingyang/PingYun-s-mini-keyboard-V2.0-powered-by-Arduino-
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