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Program overview
As a place for imparting knowledge and cultivating talents, schools have always received wide public attention. In particular, the safety of students has increasingly become the focus of social attention. Ensuring the safety of students and providing convenient services for the daily teaching activities of students, teachers, and parents are the basic requirements of the home-school program.
This solution provides a reliable automatic recognition mode, has the characteristics of convenient carrying, high recognition rate, automatic recognition, etc., and solves the problems of queuing card swiping, high card wearing requirements, and low recognition rate that exist in other technical solutions.
The characteristics and advantages of 433MHz active RFID technology for home-school communication applications
1. 433MHz RFID has the characteristics of strong diffraction, strong penetration, and long transmission distance, which is suitable for various campus environments.
2. Due to the strong diffraction performance of 433MHz, it can solve the problem of low recognition rate caused by human body occlusion in 2.4GHz RFID applications.
3. The use of dual repeater working mode not only effectively guarantees a high recognition rate, but also provides a more convenient installation method.
4. Convenient to carry. Due to the strong diffraction performance of 433MHz, the electronic tag can be carried in a school bag, hung on the chest in the form of a badge or placed in a pocket of clothes, etc. It has the characteristics of convenient carrying.
5. Long card reading distance (adjustable from 1 to 150 meters), no need to swipe the card close, automatic long-distance recognition.
6. Ultra-low power consumption, long service life of the electronic tag card (one radio frequency transmission per second, tag battery life can reach more than 5 years).
7. Allow students to enter and exit the school quickly in parallel state (maximum parallel capacity is 100 people).
8. No radiation damage, safe and reliable to use.
9. Due to the powerful long-distance characteristics of 433MHz RFID, it gives great convenience to the application of handhelds. For emergency evacuation drills, field activities, etc., you can scan the information of the people in place at the assembly location only by using the handheld machine, which is convenient for emergency evacuation and field activities and other personnel inventory.
Schematic diagram of overall architecture
Scheme principle
The system is composed of application software server, repeater, reader and electronic tag.
The implementation method is: configure an electronic tag for each student, wear the electronic tag uniformly on the chest or uniformly placed in the school bag, install a pair of repeaters at the school gate, and install a reader in the school gate duty room.
When a student goes to school, the repeater receives the electronic tag signal carried by the student and forwards the signal to the reader. The reader automatically judges that the student enters the school gate according to the signal from the repeater; on the contrary, when the student leaves school after school, The reader also automatically judges that the student is out of school based on the signal from the repeater.
In this scheme, the student’s entrance or exit is in the automatic identification mode. Even if the students have irregular activities at the school gate, as long as they finally leave the school gate, they can automatically recognize the state of their entrance or exit.
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