本设计利用AT89C51单片机来控制液晶显示器和矩阵式键盘，实现了简易的计算器功能。通过键盘输入需要计算的计算式子，该式子会显示在液晶的第一行，当键入等于号后，计算结果会显示在液晶的第二行。本设计中液晶选用1602字符型液晶显示器，显示参与运算的数字以及最终的运算结果，键盘采用4*4矩阵式键盘。-This design using AT89C51 microcontroller to control the matrix liquid crystal display and keyboard, to achieve a simple calculator function.Keyboard input required by the calculating formula, the formula is displayed in the LCD of the first line, when the type is equal to number, the results will be displayed in the LCD of the second line.The design of LCD use 1602 character LCD display and the number of operations involved in computing the final result, the keyboard uses 4* 4 matrix keyboard.