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arduino入门40-进阶-32U4矩阵键盘显示输入#跟着John一起学开发
arduino入门40 32U4做的矩阵键盘输入+oled显示 示例代码下载 gitee.com/chibisf/arduino/blob/master/入门课程40/32u4_4x4keypad_oled.ino
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