Introduction - If you have any usage issues, please Google them yourself
The design is a plus, subtraction multiplication and division, calculation function calculator. The hardware consists of four parts, a STC89C52 chip, a LCD1602 display, a 4*4 keyboard. Using STC89C52 microcontroller as the main control circuit, and then use the LCD display data, using 4*4 matrix keyboard plus some function keys to complete the input part of the circuit operation. The circuit is relatively simple, but very practical and convenient.