Research On Water Level Detection For Drain-well Based On WSN

With the current increasing emissions of urban sewage, the runoff from urban drainage systemhas become a major source of pollution of the environment, especially in the rain season, theoverflow is particularly serious. Especially large and medium cities along the river, the water levelrose rapidly when encountered heavy rain, the city’s overflow is more seriously, affecting people’sdaily life, study and work. In response to this situation, and it is necessary to research on water leveltechnology in the drain-well, it also has great significance to improve the effectiveness of thedrainage system.The thesis is about that it can monitor the drain-well water level in the background ofdrain-well in the city through the real-time wireless sensor network, and reduce the overflow ofurban drainage system. The main research work and achievements of the thesis are as follows:Firstly, the liquid level detection technology, the development of wireless sensor networktechnology and the topology structure of wireless network are researched in detail. It is proposedresearch on water level technology in the drain-well based on WSN, and subsystems in the streetform a tree network topology. It is to research on the key technology of the water level detection inthe drain-well, especially design the device suitable for the drain-well environment, supply andconsumption of the node power, and the wireless signal transmission problem under the manhole.Secondly, the design of WSN node is discussed, including the design equipment of the leveldetection, WSN node and power module. The water level detection module includes detectionsensor designing, testing circuit designing and equipment installed under the drain-well. CC2430RF chip is chosen as the wireless communication module. Furthermore, design of each node circuitis introduced. The power supply module is the use of solar power module to provide power for thenode equipment, and the charging and discharging control circuit and power conditioning circuit aredesigned.Thirdly, As the Z-Stack is a semi-open system, the Z-Stack protocol Stack are analyzed anddeveloped to meet the functional requirements of the device node. A sensor network is introduced,then establishing a sensor network data acquisition system in a tree topology. And through the serialdebug window to view the network node device process to verify the availability of Z-Stackprotocol stack.It is availability to communicate with the wireless sensor network in the drain-wellenvironment through a series experiments. The experiments results show that the installation of thenode equipment in the manhole and the direction of the transmitting antenna affect the signal transmission greatly. It can expand the distance in the wireless signal transmission and increase thestability of the signal by adding a repeater between the manholes. It is eventually sent to the networkcoordinator, and finally transmitted to Internet by the corresponding communication module. Thenthe center of monitor can realize the real-time monitoring of water level in the drain-well.According to the area of the street, the whole region is divided into several subsystems. Eachsubsystem can work independent and not interfere with each other, which can cover each drain-wellnode in areas.