基于STC12C5408AD单片机的水电比拟仪的设计

针对当前使用的水电比拟仪数据精度低、操作复杂、故障率高等问题，提出了基于STC12C5408AD单片机的水电比拟仪设计架构。将1 kHz的双极性方波加在惠斯登电桥上，惠斯登电桥的上桥臂由8个继电器控制的精密电阻构成，下桥臂用导电纸模拟天然渗流场。在导电纸上寻找与上桥臂电阻比对应的等势点，将这些等势点链接即可得到该比例的等势线，即得到等水头线。测试结果表明，与原有系统相比，该系统提高了数据精度，简化了操作步骤。

Design of Electro-Hydrodynamic Analogue Instrument Based on Single Chip Microco ntroller STC12C5408AD

The instrument of electro-hydrodynamic analogue current using has the following problems:low accuracy of data,complicated to operate,high failure r atio.In order to solve the problems,the design structure of electro-hydrodynami c analogue instrument based on the single chip microcontroller STC12C5408AD was p roposed.The 1 kHz bipolar square wave was added to the wheatstone bridge.The up per bridge arm of wheatstone bridge was consisted by eight precision resistances controlled by relay,while the lower was imitated natural flow field with condu ctive paper.Finding out the potential points on conductive paper that suited to the resistance ratios on upper bridge arm and connecting them then we can get t he water head gram.Compared with the existing system,the data accuracy of the system was improved,the procedure was simplified.