The Design Of Wireless Data Sampling System Based On SI4432

Recently, there are increasing demands for the formation of the Internet of Tingsin the country. More and more people involved in the technology research of theformation of the Internet of Things. This paper is a research about sensornetwork.SI4432is a micro power transceiver chip produced by Silicon Labs Company.It has high transmits power and long transmits distance in wireless data transmissionfiled. The design of the wireless data acquisition in the thesis was based on the chip.It can be used as an independent sensor network and it also can be used as asub-network in the Internet of Tings.In the design discussed in the thesis, the main content of the design was as follow:the entire network system was divided into8sub-nodes and1central node;8wirelessdata sensing nodes induced and got ambient temperature, and then processednecessary data; central node exchanged data with8sub-nodes through wirelesscommunications to get ambient temperature; in addition, sub-nodes should have theability of alarm, and the central node should have the ability to communicate withother network. In order to achieve the design elements above, the design usedfollowing technology and methods: the hardware network topology used1centralnode and8sub-nodes contracture; data communication used wireless transmissiontechnology; in order to ensure coordinate communication and timely alarm, it usedtime-sharing collection and time-sharing alarm; in order to communicate off-net, thecentral node set a UART interface; in order to achieve the purpose of the low powerconsumption on the sub-nodes, the sub-nodes was waken by interrupt which wasgenerated by asynchronous low-frequency clock.Finally, the produced wireless network was tested. On the open area, Its stableand reliable wireless data communication distance is up to1200m.The sub-nodes’power consumption is170μA on a average level. The sub nodes can be added to theentire system dynamically and stably. The latency of alert data on the sub-node is lessthan1minute. The maximum number of sub-nodes in the whole system can beexpanded to32. Compared with the wireless which was on sale in the market, thedesign has further communication distance, lower sub-node power consumption,higher scalability and higher price ratio.