Screen Positioning And Communication System Based On NFC

With the proliferation of large-screen devices and smartphones in our daily lives,we often need to transfer data between the two.At present,the commonly used data transmission methods include data cable,Bluetooth,WIFI and so on.However,the above data transmission methods are inconvenient to a certain extent,and the data transmission can be initiated only after the user manually and tediously sets,connects,and selects the data to be transmitted.In response to the above problems in data transmission between large-screen devices and smartphones,the laboratory team designed and implemented a "crossscreen intelligent perception system".The system consists of three parts: NFC screen positioning communication system,desktop front-end system,and NFC mobile phone.When the user brings the NFC mobile phone close to the large screen,the NFC screen positioning communication system will calculate the position of the NFC mobile phone close to the screen through the positioning algorithm.The desktop front-end system realizes the two-way wireless communication between the element at a specific position on the screen and the NFC mobile phone according to the position of the NFC mobile phone close to the screen and by means of the NFC screen positioning communication system.The main research content of this paper is the design and implementation of the embedded software system of the NFC screen positioning communication system.This design implements the NFC mobile phone real-time positioning algorithm based on the NFC array antenna,which is responsible for calculating the position of the NFC mobile phone close to the screen,and maps this position to the pixels on the screen.Wireless two-way communication is realized between the NFC mobile phone and the NFC screen positioning communication system through the NFC technology.Two-way wired communication is realized between the desktop front-end system and the NFC screen positioning communication system through a custom serial port communication protocol.This design mainly has the following innovations:1)A real-time NFC screen positioning algorithm based on polling NFC array antenna is proposed.A general NFC screen positioning communication system based on polling array antenna,NFC technology and Free RTOS operating system is designed and implemented.Combining the screen display function with the NFC positioning communication function provides a new option for information transmission between large-screen devices and NFC mobile phones.2)This design needs to be used with the "desktop front-end system" and NFC mobile phone,but it does not limit the development language,technology, and application scenarios used by the "desktop front-end system" and NFC mobile phone programs.The transmission protocol and the principle of use can be used.Therefore,this design has a high degree of system compatibility and application compatibility.3)When NFC mobile phone users use this system,they only need to move the mobile phone close to the element at a specific position on the screen to communicate with the element at that position in two directions,without other complicated and complicated settings,and have a brand-new user experience.This design realizes the direct use of the large screen and NFC mobile phone communication without cumbersome settings,and the data transmission process is intuitive,which greatly improves the convenience of user operations and user experience,which is in line with the era of the Internet of Things.Based on this system,a rich application ecology can be constructed,which has a good application prospect.