chrispeng [ad_1]
1. Design principles
In view of the concentration of students entering school in the morning and leaving school in the afternoon, the large number of students requires the RFID system to have high anti-conflict performance, can not miss the card, ensure that the tag ID is 100% accurately collected, and 100% correct in and out of judgment, so as to play The value of the system platform of home-school communication.
(1) Practicability and ease of use The system construction always implements the application-oriented and practical approach, adheres to customer needs as the core, and focuses on the automatic processing and analysis of data streams; at the same time, it adopts a graphical user interface (GUI) to be close to users Use habits, clear and concise design, convenient and intuitive use, reducing personnel training and grinding costs;
(2) Advancement and maturity
The system design adopts advanced concepts, technologies and methods, while paying attention to the relative maturity of structure, equipment, and tools, so that the system has a greater potential for development;
(3) Openness and standardization
In order to meet the cooperative operation ability of the technology and equipment selected by the system, the system uses standardized communication methods as much as possible, and makes the software interface and protocol public, allowing other application software to access and call, so as to make the system open;
(4) Scalability and easy maintenance
In order to adapt to the continuous changes of the campus, the system can easily expand the number of equipment; the installation and use of equipment is also as simple as possible for easy maintenance.
(5) Reliability and stability
While considering the technological advancement and openness, we should proceed from the aspects of system structure, technical measures, equipment performance, system management, technical support and maintenance capabilities to ensure the reliability and stability of system operation and achieve the maximum mean time between failures. .
2. Design plan
The basic application principle of RFID automatic identification technology in the campus personnel management system is roughly as follows: First, ground triggers will be installed on the inner and outer sides of the school gate, so that two signal coverage areas are formed on both sides of the school gate. Secondly, each student carries a tag (electronic student ID). When the electronic tag worn by the student approaches the ground trigger coverage area at the entrance of the school, the receiving module in the tag starts to work, wakes up and sends data, and is placed in The reader of the school gate can receive the tag data and show that the tag has reached the area outside the gate. Similarly, when students enter the trigger area on the inner side of the gate, they will be awakened by the ground trigger arranged on the inner side and send data. The reader receives the tag data, which can show that it reaches the inner area. The above data is read by the reader and sent to the hardware middleware to complete the judgment of entry and exit. Finally, the hardware middleware transmits the result and ID data with the determined entry and exit judgment to the server, and the system starts the SMS platform based on these judgments to send safe SMS .
In addition, using the system’s text messages and network platform, the head teacher can send each student’s school learning and living conditions to the parent’s mobile phone and e-mail in a centralized or irregular manner, eliminating the need for the teacher to notify the parent one by one or the parent’s absence. The various communication barriers created by waiting for the situation are convenient and quick.
3. The principle of the school-leaving system
In response to the construction requirements of the campus personnel management system, Shanghai Xiupai designed a system consisting of a data center, readers, student cards, triggers inside and outside the school gate, and a background management system.
1. Install a certain number of triggers on the inside and outside of the campus entrance where the label needs to be triggered. The number of trigger wakers is determined by the required coverage and positioning accuracy;
2. Connect each reader to the background positioning server via Ethernet to form a wireless positioning network;
3. Assign personnel electronic tags to students, and establish a one-to-one correspondence between “tags” and “persons”;
4. Install and run the positioning software in the server, and the positioning data can be directly written to the database or integrated into other systems.
The schematic diagram of the system scheme is as follows:
Schematic diagram of Xiupai Home-School Pass Program
In order to judge the entry and exit, the distance between the internal and external triggers is required to be more than 7 meters. In order to ensure the accurate reception of data, a reader is installed inside and outside for data reception.
Students must bring their cards when entering and exiting the school gate. When entering the trigger area outside the school gate, the tag starts to work and emits radio frequency. It is first recognized by the reader, and the tag leaves the trigger area outside the school gate and stops working at the same time. When a student passes through the school gate and reaches the trigger area inside the school gate, the tag works again and is recognized by the reader.
After the hardware middleware receives the data, it makes a data judgment and judges whether the label is entering school, leaving school, or cannot be judged. Then it is sent to the corresponding back-end management system through TCP/IP, and the SMS platform controlled by the back-end management system sends a text message to the parent of the student.
The situation of leaving school is similar to the process of entering school.
4. System advantages
1. Read function
Due to the large number of students entering and exiting the school gate during the peak period and there is a certain degree of obstruction, the electronic tags are emitted in a concentrated manner, and there is a certain reading conflict between the readers. But after the trigger mechanism is added, when the tag is not in the trigger area, the tag does not transmit 2.4G, which greatly reduces the number of concurrent tags, strengthens the anti-collision, and improves the ability of the reader to distribute information on the tag data.
2. Access recognition and judgment function
Pure 2.45G technology can realize accurate label entry and exit judgment, and channel management has certain difficulties. Combining trigger technology, through two independent trigger areas inside and outside the school gate, the label entry and exit direction can be clearly determined. When the ground trigger triggers the tag, it will send its own ID to the tag, and then pass the information to the reader via 2.4G.
[ad_2]
