Research On The System Of Low-Power Consumption Wireless Digital Water-Level Data Acquisition

The data of water level is an important part of hydrological parameters.The accuracy and real-time of the water level measurement directly influences on the reservoir's flood prevention security, irrigation, power generation, and so on. The inductive digital water-level sensor, which is developed by the Institute of Measurement and Control Technology, Taiyuan University of Techonology, has been widely used these years in water level measuring field. Especially in the "Yellow River Diversion Project ", it has been large-scale used, and played an important role.The application of the inductive digital water-level sensor needs to draw out the signal and power supply cable from the monitor center. Many hydrology monitoring spots are located in the remote valley where is far from the village. The natural environment is awful. The cabling cost is expensive. It is also difficult to debug and make network. These factors limit the application of the inductive digital water-level sensor. Giving full consideration to the system's low-power problem, the design uses the inductive digital water-level sensor to build a low-power consumption wireless digital water level data acquisition system with the help of the RF wireless technology. Powered by solar battery at each measurement spot, the system needs no wiring, so the application scope of the sensor is expanded.The design of low-power consumption wireless digital water-level data acquisition system is combined with the embedded processing technology, RF wireless technology and computer technology, it realizes the remote data acquisition and transmition for the water level. In this system, wireless transmitter sends water level data to the central control computer by the way of wireless communication. After data being received, the computer sends acknowledgement signal and displays the data to the operators.The paper firstly gives the overall designing programme and main structure of the system, introduces its working principle, tells the RF wireless communication method, elaborates the principles to follow in hardware design as well.Secondly, the paper describes the sub-device's software and hardware realizing process in detail. In the hardware section, it analyzes the working theory of the inductive digital water-level sensor; introduces the design of the wireless transmitter, including the sensor's adjusting circuit, RF circuit module and the controller's peripheral circuit; simply introduces the RF transmitter's anti-jamming measures and lower-device power supply. The design of the RF wirless transmitter is the key. In the software section, it elaborates the mode setting and communication protocol for the RF communication.Thirdly, the paper gives a specific description on the upper-device's software and hardware design. The hardware section mainly refers to the serial communication interface circuit between the upper-device's front-end equipment and the central control computer. The software section briefly states the serial communication software of the front-end equipment, and emphasizes the design and function of the central control computer's management software. It relates to the management software's realizing method and database development, and displays the operation interface.At last, through experiment, the working voltage and working current are measured, the power consumption of the lower-device is calculated. Taking the Taiyuan area as the example, the paper analyzes the storage battery and solar panel's working condition. Taking full redundancy into consideration, the design chooses the most economical and suitable solar panel and storage battery.