Design Of RFID Card Reader Based On STM32 And Its Anti-collision Research

In the last ten years,there has been a great change in people's lives.The Internet has developed fast in the last ten years.It basically covers every corner of people's lives.It can be said that the development of Internet has become saturated.Modern society is developing in the direction of intelligence.The Internet of things plays a vital role in the development of the direction of intelligence.When it comes to the Internet of things,people will naturally think of RFID(Radio Frequency Identification),because RFID is one of the key technologies in the Internet of things.RFID has many characteristics,such as non-contact,fast recognition speed,simple operation,long service life and so on,which has made it rapid development in the last few years,especially in logistics,highway,parking,smart home,door control,transportation,campus and other places.The development of the Internet of things has promoted the application and development of RFID technology,and the emergence of multi label has promoted the research on the anti-collision of RFID.The main research content of this topic is the design of the close range RFID reader with frequency of 13.56 MHz,and some research on its anti-collision detection algorithm.The main contents include:1.Made a concise introduction to the development of RFID technology,including the current situation at home and abroad and some existing problems.2.Introduce the basic principles and internal structure of the RFID card reader system.It includes the introduction of the functions and structures of the components,for example,the card reader,the transponder,the antenna,the RFID high level,etc.Then it further expounds the application field of RFID for the protocol standard of RFID,and summary the protocol standards for RFID.3.Design the hardware scheme of the card reader.Summarize the principle and performance of STM32 micro controller and radio frequency chip MFRC522.Design the hardware of the RF module of the RFID card reader with MFRC522 as the core,and introduce the working principle of S50 card in detail.4.Design the program required for the card reader work,including the card reader program and the host computer interface program.The ISO 14443 communication protocol of 13.56 MHz RFID system is also introduced.5.Test the designed card reader,including searching card,reading card,recharging,deducting,etc.6.Study the common anti-collision algorithm of RFID reader.These collision avoidance algorithms are divided into two major classes.They are ALOHA anti-collision algorithm and binary tree anti-collision algorithm respectively.