Abstract
This topic realizes using the monolithic integrated circuit to the water supply pressure carries on the survey and the control. Its electric circuit mainly uses at89C51 monolithic integrated circuit to take the pressure control core, the electric circuit to examines the pressure signal with the detecting element to carry on the sampling, transforms after A/D into the digital signal, gives the monolithic integrated circuit to carry on the operating control, monolithic integrated circuit's output signal enlarges after the amplifying circuit, gives 24V to direct current the intermediate relay control frequency changer through the frequency changer control motor's rotational speed to realize to the water supply pressure control.
key words: The sensor, A/D transforms, controller, AT89C51
