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lednum
- 设计一个单片机电路,2个按键,1位数码管,4个LED,1个按键按下, 数码管自增1(up),另一个按键按下,数码管自减1(down),4个LED 显示数字值。-Design a single-chip circuit, two buttons, a digital control, 4 LED, 1 press the keys, digital control since by 1 (up), another button press, digital control since