The Design And Application Of The Micro-Power Wireless Communication System Based 433MHz

After experienced several stages spanning development, today's wireless communication technology has been widely used in our normal daily lives. The short-range wireless communications technology, as an important one, has also been considerable development. From the common infrared communication, Bluetooth and WiFi communication technologies to UWB and Zigbee, although a wide variety, but on the "short distance, micro-power, and a certain ability to pass through the wall of a low-cost wireless communications," this demand, the above several methods are not well satisfied. To solve this problem, we designed and developed based on the 433MHz band micro-power short-range wireless communication system terminal.Firstly, the application scenario system gives a brief introduction, and gives a more comprehensive needs analysis. After comparing multiple solutions, according to the overall needs of the project, we chose the Renesas RL78 series G13 chip family as an embedded platform, and put forward the overall scheme of micro-power wireless communication system terminal. It has been divided functional modules and each module circuit diagram of the hardware design around the main chip R5F100FE and RF chip Si4432. Then according to the schematic of each module, carried out in line with PCB design flow and standard printed circuit board design, and completed the layout of components and wiring.Secondly, this article describes how to build a software development environment and hardware test environment, and software system requirements micro-power wireless communication terminal performs the analysis, summed up the need to achieve the functionality, and based on the functional requirements of the design of the wireless communication terminal master and slave each state machine, each state is given in Fig. In order to achieve micro-power indicator, the system uses a main "break detection process," the design ideas, so most of the time can be embedded microcontroller in a low-power sleep state, when there is need to address the task of re-emergence processing. The wireless communication part of the system software, the strict definition of the communication packet and wireless communication transceiver processes. He also designed a host radio air wake from sleep machine process, and gives a strict wake-up timing diagram to solve the micro-power wireless communication module implementation issues.After that, the kind of micro-power wireless communication system terminal conducted various tests, which contains the system functional testing and performance reliability testing. After continuous repeated tests show that the design and development of micro-power wireless communication systems based on short-range wireless communications 433MHz band, and have some ability to communicate through the wall. In addition, while the perfect realization of micro-power indicator. The entire system is stable and meet the needs of short-range wireless communications within a small area networking.Finally, the micro-power wireless communication system terminal in the practical application of medical escort to do the relevant aspects of the discussion and design, according to the current domestic medical escort communication needs to do a thorough optimization of the system software, and gives a simple small networking protocol.