考勤，读取考勤信息，输出考勤信息，计算考勤类型，刷卡时间，下班时间，工时等-Attendance, attendance to read the information, output time and attendance information, the type of calculation of attendance, credit card time, working hours, working hours, etc.

RFID刷卡设计使用说明，本人精心制作，功能巧妙，适用于发开ID刷卡技术人员参考。-RFID card design instructions, I elaborate, function is clever, applicable to send ID card technical personnel reference.

基于51单片机的刷卡门禁系统。我不知道啊 我只想要资料-Based on 51 single-chip card access control system. I do not know ah I just want information