Design And Research Of Long Distance Attendance System Which Is Based On RFID

Now,the checking attendance tends to adopt the contacting card as main checkingmethod.While this approach is extremely inconvenient for driving people.They have to getdown and it may cause traffic jam during the work rush.The system which are compatiblewith original checking methods is upgraded in this paper.A remote checking system isdesigned,including car-carrying RFID card reader,remote wireless data receiver and uppermachine.The main contents of this paper are listed as follows:1.Several attendance-checking means are researched and advantages anddisadvantages of them are detailed analyzed. Also their characters are discussedrespectively including history,international development situation and futuretrends.According to actual needs,the long-distance attendance system is detailedlydesigned.2.The hardware circuit of lower machine has been designed and debugged.RF cardreader uses STM32F103VBT6as the main controller,and uses card reader and wirelessdata sender as additional module.The remote data receiver uses the STC89C52RC as themain processor and uses wireless data receiver,a transmission module of485,USBdownloading circuit,etc as additional module.3. Software of the RFID attendance system has been designed including upper andlower machine.The lower machine part includes the procedure for the RF reader and theremote wireless data receiver. The lower machine part is designed for users’ checking.Thesystem can satisfy the long-distance checking need.4.The anti-collision algorithm has been discussed. A detailed introduction about thedifferent types of collision is researched while the RFID is reading the digital tag.A deepanalysis about the binary tree search algorithm and ALOHA algorithm is made.After adetailed research of ALOHA algorithm,we proposed an improved dynamic frame slotALOHA algorithm.The MATLAB simulation results show that the proposed algorithm canimprove the performance of tags identification.