Distributed Computer-controlled Multipoint Water Level Detection System

Scientific and technological development is inseparable from the important link experiment, water science and especially the river training works. Because the water is very complicated natural conditions, relying solely on theoretical calculations there are certain difficulties, we must practice test. So it is usually completion of a water project in the initial design, the requirement for a certain percentage of model experiments According to theoretical calculations of data to be verified, the various design options and compare that to determine the best option. In model experiments often required in the water level, in addition, Flow control is also needed for the water level in the water supply system of closed-loop control, it is extremely important measurement of the water level. At present, the water level model experiments testing the system accuracy, speed slowly, the small scope of measurement points, Real-time synchronization firms generally poor, the authors put forward a microcomputer-based distributed multi-point liquid level detection system. The article introduces the present use of the water level sensor, and the existence of some problems, on the basic issues of the overview and the distributed system design idea The water level makes the detection system design compared with the previous set of linear, more of a choice Distributed design and better able to adapt to the current measurement of the water-level projects growing demand. The system is the basic concept : from a few microcontrollers constitutes bottom network, measured by the distribution scenarios microcontroller, Each MCU control of the water level sensor Taiwan 1-4 for the original water level data collection. Using a PC as the main control aircraft scene, using computer technology to achieve the scene of the PC and microcontroller communications and control. PC scene according to the experimental requirements of the microcontroller can be ordered. For example, the test cycle, the number of measurement, time synchronization. PC scene with SCM Communications will receive the original water level data into the database, and then analyze Operational and handling. Also, the scene of PC and LAN connected, the scene of the original experiment data will be in the form of real-time appeared on the Irlternet, for research, design reference for decision-making. The system is currently more popular place to detect water level sensor, driven by a stepping motor, When the stepper motor to receive a pulse signal, it will set a direction for a fixed angeof rotation (step angle). Through the gears and wire rod, will step angle measuring rod into the linear displacement. Through computer rotation of the stepper motor control, and thereby achieve control test poles Mobile purposes. When measuring rod measuring needle into contact with the surface, the sensor will be sent to the computer in contravention of the water signal, At this point the computer so that the electrical work to a halt, recorded current value, completed a water level measurement process. The whole water level measurement system was designed by a computer and SCM components of the PC and the next crew of distributed control system, Under the plan went to the scene the water level measurement, the water level data collection, Finally, the state information and the results of the data were transferred to the PC. At this time involves the PC and the next crew of communication design. Ordinary PC serial port is the standard RS232, the water level measurement system is used by the RS485 interface, Therefore, using the Mode1-9002-B active converters, for the +5 V power supply from the computer USB port to provide. This distributed computer mulpipoint water level detection system performance is better measured points easy to expand, the measuring points synchronous real-time high and is not subject to water quality, water temperature, the impact of such polarization. In large full investigation, research, we adhere to the economic, practical, reliable, advanced the principles of the premise, maintain the strengths of the original equipment parts and to the development of a distributed network architecture based on the multi-point level detection system, is a very important practical significance and value.