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- Proteus制作:LCD显示三位电压值及上下限值,矩阵键盘设置三位上下限,电压值超上下限后LED闪烁且蜂鸣器报警,键盘控制闪烁、报警频率-Proteus production: LCD display three-bit voltage and the upper and lower limits, the matrix keyboard set three upper and lower limits, the voltage value on the lower limit after t