Abstract:

The instrument of electro-hydrodynamic analogue current using has the following problems:low accuracy of data,complicated to operate,high failure ratio.In order to solve the problems,the design structure of electro-hydrodynamic analogue instrument based on the single chip microcontroller STC12C5408AD was proposed.The 1 kHz bipolar square wave was added to the wheatstone bridge.The upper bridge arm of wheatstone bridge was consisted by eight precision resistances controlled by relay,while the lower was imitated natural flow field with conductive 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 the water head gram.Compared with the existing system，the data accuracy of the system was improved,the procedure was simplified.

Key words: electro-hydrodynamic analogue, wheatstone bridge, single chipmicro computer, flow field