Development Of RFID Reading And Writing Device And Multi-function Label For Pig Farm Based On Linux

In recent years, animal epidemic occurred frequently, so that the masses of food safetythreats facing more and more serious. As it has the advantages of no contact、safe and fast、automatic recognition, RFID technology is widely used in animal tracking identification andfood safety management by the international companies and research institutions. In ourcountry, pork products innocuous news happens frequently. People are eager to eat "green"pork at crunch time. There is a need to construct a Food safety monitoring system. In recentyears,2.4GHz RFID technologies to identify the distance have been largely used. It can reada plurality of high-speed mobile information on the label and it is more efficient in realisticapplications. It is significant for the safety monitoring of work and improvement of theinformation management level of pig farms to build a management system by the technology.In this paper, in order to solve the problems, we designed the farms dedicated RFID readerand multi-function tags based on Linux system.This paper first introduces the RFID technology application status and developmenttrend at home and abroad. After deep research, we work out the overall plan of the system.We use the ARM9processor as the control unit and the transplant the Linux operating systemon it, and determine the3G module and GPS module as the reading unit to the transmitchannel data and locate the information transmitting resource.The hardware design of the system is using S3C2440as a MCU. RF transceiver moduleuses nRF24L01+chip2.4GHz.3G module uses AD3812module by ZTE. GPScommunication module uses ET-312chip by Taiwan Ring Company. The MCU tag usesMSP430microcontroller. Digital temperature sensor uses LM75A by PHILIPS to collecttemperature information, eventually completed the designing of reading and writing deviceand label circuits..In order to enhance the later development and system performance. The embeddedLinux operating system is transplanted on S3C2440successfully. In this paper, we learn thearchitecture of Linux deeply, introduces the four sub-systems of the kernel and its workingprinciple in detail-memory management, process management, virtual file system and network system. We have finished the embedded Linux system transplantation based onS3C2440processor. Steps in detail to install the boot loader，cross compiler environment andu-boot startup process. Analyze the Linux kernel startup process, finish the kernelconfiguration compiling and making the root file system. We have fully study the Linuxdriver working principle. It is also introduced that install and uninstall Linux module anddriver development process problems. Finally, we take the nRF24L01+chip as an example tointroduce some related protocols of2.4GHz RF transceiver, describe the process oftransmitting and receiving data in detail and finish the module software design.In the concluding chapter of paper, we have finished the work summary and outlook andexplained the lack of defects in design and technology. We put forward the next step of thework contents and direction to improve the system.