基于RFID的考勤系统的设计与实现

为弥补传统课堂考勤机制占用上课时间, 无法避免替点名现象的发生, 研制了一套基于无线射频识别（RFID: Radio Frequency Identification）技术的校园课堂考勤系统。该系统结合校园中已普及的“一卡通”等学生IC卡, 采用两对对射式红外传感器和FM1702SL无线射频读卡器相结合方式, 获取上课学生的姓名、 学号和进出教室状态等信息, 并通过nRF24L01无线传输模块和FT232RL电平转换电路, 将信息传输到上位机。上位机通过由Visual Basic语言编写的软件程序, 自动统计和整理信息, 并生成学生平时成绩, 免去了教师手动统计的负担。对101名学生代刷卡的违规操作及82名学生正常刷卡操作进行测试, 结果显示, 违规进出学生人数为98人, 正常刷卡人数为81人, 相对误差均小于3%。

The Design and Implementation of Attendance System Usedin Classroom Based on Radio Frequency Identification Technology

In order to make up the disadvantage that the traditional attendance system used in classroom takes up the class time. At thesame time, in order to improve students'class attendance, and eliminate the burden that the teachers Statistics students usually scores manually. We developed a attendance system used in campus classroom based on radio frequency identification technology. The system combines student IC card which has been popular used on campus. It uses two alignment type infrared sensors combined FM1702SL wireless RF card reader to Get students' name, number, and status that students out of the classroom or not. Then the information is transmitted to the host computer through the nRF24L01 wireless transmission module and the FT232RL level conversion circuit. The host computer statistics, organizes information and generate students usual results through the software program written in Visual Basic language. It can eliminate the burden of teachers. System testing arrangements for 183 college students carrying the Student IC card out of the classroom, which 101 students from bringing himself and other students IC card and continuous brush cards illegal operations in and out of the classroom, and the remaining 82 students make anormal credit cardoperation. The test results show that 98 students violate therules amd 81 students obey the rules, the relative error is less than 3%.