整个系统用STM32单片机作为中央控制器，由单片机执行采集内部RTC值，简易电子计算器信号通过单片机I/O传给LCD显示屏，单片机模块，控制驱动模块、驱动显示模块，通过显示模块来实现信号的输出、LCD显示屏的显示及相关的控制功能。
（1）利用液晶块显示；
（2）实现“+”“-”“×”“÷”的运算；(The whole system uses STM32 single-chip microcomputer as the central controller, and the single-chip microcomputer carries out the collection of internal RTC value. The signal of simple electronic calculator is transmitted to LCD display through I / O of single-chip microcomputer. The single-chip microcomputer module, control driving module and driving display module realize the signal output, LCD display and related control functions through the display module.)