Electronic attendance system used by students

Abstract

The invention discloses an electronic attendance system used by students which comprises a student card and outlet / inlet radio-frequency transmitting equipment, wherein the outlet / inlet radio-frequency transmitting equipment comprises two radio-frequency transmitting antennae, and two radio-frequency transmitting antennae transmit different recognition signals at different time and with the same frequency; the student card comprises a radio-frequency receiving circuit, a microprocessor and a GSM (global system for mobile communications) / GPRS (general packet radio service) communication module, and the radio-frequency receiving circuit and the GSM / GPRS communication module are respectively connected with the microprocessor; the microprocessor of the student card judges whether students are in a going-in or going-out state according to the strong or weak changes of different recognition signals received by the radio-frequency receiving circuit, and sends the judged results to the server of the system through a GSM / GPRS wireless data channel. By adopting the system in the invention, students can go in or out in great numbers with no need of approaching the system to swipe the card, thereby causing no congestion or retention at the entrance or exit and generating accurate and reliable attendance information; the two transmitting antennae of the equipment at the entrance and exit can transmit signals at different time and with the same frequency, therefore, less frequency resources are occupied, the walking distance required during entrance or exist is short, and a student can be accurately recognized within 10m; and furthermore, the equipment in the invention is simple in structure and lower in cost.

Description

[technical field] [0001] The invention relates to RF access identification technology, in particular to a student electronic attendance system. [Background technique] [0002] Passive RFID access control system or fingerprint access control requires students to swipe their cards or press their fingerprints on one or more fixed devices one by one. Active RFID also requires a short distance between student cards and receivers or a door frame receiver. When a large number of students pass through, it will cause crowded queues and waste unnecessary time. [0003] The traditional student electronic attendance system installs electronic attendance equipment at the school gate. Among them, the passive RFID access control system or fingerprint access control requires students to swipe their cards or press their fingerprints on one or more fixed devices one by one. When students pass the school gate, they swipe their cards to achieve attendance. , the attendance data is sent to the ...

AI Technical Summary

Problems solved by technology

This method of electronic attendance and SMS notification still has major defects in practice: first, students must swipe their cards or press their fingerprints one by one, which may easily cause congestion and retention of students at the school gate; second, the initiative to swipe their cards is in the hands of students Students may forget to swipe their cards when they pass the school gate, or they may return after swiping their cards, resulting in inaccurate attendance

[0005] For active RFID, the two receivers need to be placed at two ends about 30 meters apart to be able to identify correctly. The data sent by a large number of active RFID cannot be guaranteed not to collide. Only some algorithms can be used, such as making a mathematical model at the transmitter After a collision, the collision can be avoided in the second or third time. At the receiving end, the collision data overlap rate is not very high (generally less than 30% of the theoretical limit of 50%), and data recovery is performed, which increases the complexity of the access control equipment. and the harshness of cost and conditions of use

Moreover, the defects caused by this kind of data collision can only be reduced by technical means and algorithms such as multiple data confirmation of data wireless data recovery in the later stage to reduce the lack of access and attendance information

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