Low-power Wireless Environment Index Sensor System Based On Internet Of Things

In recent years, the Internet of things has been paid great attention to because of its high degree of automation, flexible networking, fast transmission of information and many other advantages. As a crucial part of the Internet of things, Sensor systems play a crucial role in the access to information and the perceived performance and other aspects. Up to now, the research on the Things sensor system has still been in its infancy, and relevant technologies have not been immature. Therefore, it is of practical significance to develop a kind of Internet of things sensing system with superior performance such as low power consumption, high network robustness, high transmission efficiency. In the thesis, a research and a development of a low-power wireless environment index sensor system based on Internet of Things are made. The main researches are as follows.(1)A deep research of the networking technology for low power sensor is made, a proposal of an architecture for ultra low-power wireless environment index sensor system based on Internet of Things is performed, and a determination of the hardware system consisting of MSP430F149micro controller as low power master control chip and peripheral circuits and the software algorithms with the enhancement of the robustness of the sensor network, communication efficiency and decrease of the power consumption as the goals are conducted.(2) A time division strategy in which a random number algorithm is introduced into sensor networks is proposed by studying the relationship between the communication efficiency of sensor networks and the power consumption of the sensor, thus making the consumption reduce greatly and the communication efficiency of sensor networks raise remarkably.(3)A design and a development of sensor system are carried out. The control of the external clock circuit, the AD sampling circuit, dual preamplifier circuit, ultra-low power supply circuit,2.4G wireless module has been implemented by the programming language of C; The robustness of the wireless network is boosted by developing the network relay module with high performance-cost-ratio; The large number of peripheral hardware circuit design; The peripheral hardware circuit design is greatly simplified by designing the AD conversion control algorithm, battery power estimation algorithm, key multiplexing technology and etc. elaborately;The power consumption is reduced remarkably and the communication efficiency of sensor networks is promoted greatly by introducing a random number algorithm into the sensor networks time division strategy.(4) The whole system has been constructed. A realization of all the expected design goals has been made by utilizing Digi wireless gateway, network monitoring center server and combining the whole things sensing, transmission and information presentation together organically.(4) In order to verify the stability and robustness of the network system, a small sensor networking systems is constructed, and the strategies and algorithm for the actual application are tested. The results show that the system can not only perceive, transmit and present information effectively, and it also is characterized by very low power consumption and high efficiency.