Intelligent interactive system based on context awareness and RFID

　　Intelligent interactive system based on context awareness and RFID

　　Context awareness is an important supporting technology for the integration of information space and physical space. It enables users' available computing environment and software resources to dynamically adapt to relevant historical state information. Context is an implicit intuition in people’s rational reasoning. It usually points to the surrounding environment of the center of interest, providing original information (such as when, where, and under what circumstances) and a direct understanding of this information. The context is derived from the cognitive domain. Angles can be divided into user context, environmental context, and computing context. If a system uses context to provide relevant information or services to users, it is considered context-aware. Such perceptual behaviors include contextual triggering, tagging information (such as tagging the author of photos, movies, posters, etc. through radio frequency identification (RFID) tags), neighboring object selection, automatic execution of services (such as automatic call forwarding, SMS), automatic Configuration (such as setting the phone to mute when entering the performance hall), etc. RFID is currently the most promising automatic identification technology. Compared with traditional identification technology, RFID has the advantages of multi-target simultaneous identification, fast reading and writing speed, large storage space, non-contact, long working distance, strong penetration, and appearance. Various advantages such as diversity and strong adaptability to the working environment.

　　Because the RFID transponder has a globally unique identification, it can realize physical interconnection and information sharing through RFID system interconnection. With the promotion of RFID technology, transponders (such as tags, etc.) will be ubiquitous". Because the tag as a transponder will not change the appearance of the physical entity and is transparent to the user, RFID technology is a link to the physical space. The fusion with the information space provides the possibility and is one of the foundations for the realization of the context-aware system. Perceiving the context related to the interactive task in the computing scene through RFID can realize the implicit interaction, so that the computing terminal and daily objects have the ability to interact with people. The ability to interact naturally and harmoniously. At present, most of the domestic research on context-aware computing is in the theoretical stage, and there are few real application systems. Therefore, based on the advantages of RFID technology in context recording and perception, this paper studies the use of embedded in the mobile computing environment The interactive prototype system of the device.

　　It consists of the following 5 modules:

　　(1) Radio frequency identification module, Transceiver IC$6700 is responsible for the communication between reader and transponder. The communication between radio frequency reader module and MCU is realized based on the serial digital communication interface provided by $6700 to MCU, including SCLOCK, DIN, DOUT and M-ERR , Respectively represent clock line, data input line, data output line and error control.

　　(2) The communication module provides a series of protocols supporting wireless communication functions, and completes the communication functions between nodes and between mobile terminals and nodes. This article uses the Bluetooth module ROK101 007 and communicates with the MCU through UART, and the communication rate is 4 800 bit/ Adjustable between s-57 600 bit/s, the baud rate of the initial communication of the system is set to 57 600 bit/s, 8 data bits, 1 stop bit, no parity bit. The MCU receives the data sent by the Bluetooth module in an interrupt mode. The working voltage (5 V) of the microcontroller end is different from the working voltage (3.3 V) of the Bluetooth chip. When connecting these two parts, a level conversion chip 74HC14 is added.

　　(3) The storage module controls the 24LC256 through the I2C bus to save the original context data in the communication process.

　　(4) Clock module, using M4lT8l to provide real-time clock data and ensure time synchronization.

　　(5) The main control (MCU) module is responsible for data processing and protocol conversion, and completes the control of other modules. In addition, the BTEnableReader node also includes buttons and acousto-optic peripherals for error and status detection. The specific hardware structure of the node is shown in Figure 3.

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