Based on single-chip digital control and button design, suitable for beginners.

9.5 键盘和发光数码管显示
.........................\keyboard
.........................\........\keyboard
.........................\........\keyboard.c
.........................\........\keyboard.lnp
.........................\........\keyboard.LST
.........................\........\keyboard.M51
.........................\........\keyboard.OBJ
.........................\........\keyboard.Opt
.........................\........\keyboard.plg
.........................\........\keyboard.SRC
.........................\........\keyboard.Uv2
.........................\........\keyboard_Opt.Bak
.........................\........\keyboard_Uv2.Bak
.........................\led
.........................\...\led
.........................\...\led.c
.........................\...\led.lnp
.........................\...\led.LST
.........................\...\led.M51
.........................\...\led.OBJ
.........................\...\led.Opt
.........................\...\led.plg
.........................\...\led.Uv2
.........................\...\led_Opt.Bak
.........................\...\led_Uv2.Bak

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