ZigBee wireless communication module ZigBee is a low-speed wireless personal area network technology. The CC2430 used in the design is a system-on-chip introduced by Chipon to implement embedded ZigBee applications. Because the CC2430 integrates CC2420RF transceivers, enhanced industrial-standard 8051 MCUs, 32/64/128 Byte Flash memory, and 8 SRAM high-performance modules on the hardware, the entire system takes up very little space, and the entire module size does not exceed the palm range. Carrying and operating in the production environment, it has the characteristics of low cost, low power consumption, high security, flexible work frequency band and network structure. Therefore, it is very suitable for automobile assembly workshops and 4S shop accessories replacement departments where the communication data volume is relatively small and the speed is relatively low.
The routing node design routing node plays a role in collecting and synthesizing all kinds of auto parts tag information in the entire system. The ZigBee wireless transceiver module cooperates with SUM-SANG's S3C2440 microprocessing. The CC2430 in the routing node is the core of the entire ZigBee network in establishing the network. It allocates addresses for the sub-devices that apply for joining the network, determines the network topology type and receives the aggregated data. The S3C2440 microprocessor can externally expand large-capacity devices such as RAM, LCD, USB, and Ethernet interfaces, and can perform functions such as data processing, storage, LCD screen display, and Ethernet transmission. The structure of the routing node is as shown.
Software Design The ZigBee network supports a variety of topologies such as star, cluster, and peering. In this design, a simple star topology was used based on the unidirectionality of the information transmitted in the specific production environment of the automobile assembly shop [12]. In the star structure, each slave device does not communicate with each other, and all information is collected and forwarded by the routing node. After a connection is established between the device and the routing node, the routing node allocates a 16-bit segment address for each slave device. After that, the slave device will use the 16-bit segment address to communicate within the network.
After the terminal node and the routing node are initialized, the routing terminal establishes a network and scans the node terminals in the network channel. When scanning a node to attempt to join the network, the routing node assigns a 16-bit segment address. The network is established. The node terminal enters a state of waiting to recognize the RFID tag, reads the information when the car part tag is recognized, and sends it to the routing node. This is the process of interrupting and executing the interrupt response function. After receiving the information at the routing node end, its wireless transceiver module transmits the received information to the ARM platform through the serial port, completes the data display, and then transmits the Ethernet to the PC platform to establish the management database. The software design flow is as shown.
Experimental conclusions After completing the hardware and software design, the author conducted specific experimental operations in the laboratory. In the experimental operation, the author placed the routing terminal in a laboratory, placed a node terminal in another laboratory about 30m away from the routing terminal, and wrote the sequence in several sectors of the RFID card through software. Number, name, date of manufacture, and material details. After the node terminal recognizes the RFID identifier, the LCD of the routing terminal accurately displays the RFID information. After repeated trials, the effective transmission range of ZigBee can reach 80m or more in an unobstructed room, and can reach nearly 50m if it is blocked by a cement wall, and it can completely meet the flow requirements of fittings. The experimental results are as shown.
Conclusion The author has designed an automobile industry information system model based on ZigBee technology, RFID technology and built on the embedded platform. The system can be applied to the collection, transmission and collection of parts information in the automotive assembly and repair environment, and is expected to be greatly improved over the reliability and fastness of traditional information transmission methods. Due to the limitation of experimental conditions, the design of the system model is only completed in the laboratory and the push of experimental data is completed. The experimental results are relatively complete and reliable, and the actual factory application process and test results need to be further completed.
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