Introduction - If you have any usage issues, please Google them yourself
The use of MSC-51 Series MCU AT89C52 as a central processing unit to AT24XX series of chips for the memory card. 4x4 determinant using keyboard keyboard, Seven-Segment LED display module using a digital display tube. 51 single-chip microcomputer to control the selection of the circuit, single-chip and IC card, button, display tube connection. MCU to read the IC card information, microcontroller has been scanning button, if keys are single-chip sensor and the IC card to query or modify the content, single-chip at this time through the display circuit to display the IC card in the process of amending the information or query information.