51单片机按键式计算机,可以进行简单的加减乘除计算，使用方便(my English very bad,so I don't write)

用于NI单片机电流电压采样以及显示，其中含有部分程控电流与程控电压，可用于并联限流限压电路。(It is used for sampling and displaying the current and voltage of NI single-chip microcomputer. It contains part of program-controlled current and program-controlled voltage and can be used for parallel