上班，驾校，校园上课，计时刷卡系统。

功能实现了：开机显示时间，将接触式IC卡插入卡槽，输入密码，(可以将卡拔了)开始计时，再次插卡，计算时间，并将总时间写入卡内，当时间超过一定时长，需要将时间清0.-Work, driving school, school class, time card system. Functions to achieve: the boot display time, the contactless IC card into the slot, enter the password (you can pull the card) start time, the card again, the computation time and total time to write the card, when the time exceeds a certain duration, time needs to be cleared.