关键词:数字式流量计 、流量、单片机
Abstract
Current mankind have already followed the arithmetic figure ages,this text the arithmetic figure type that design the floweter spread to hall,englarger,single slice the machine CPU the processor to show the system with LCD to constitute.
The hall spreads to adopt the made-up magnetism of hall effect dpread to hall sensor.The stability that have the influence is good,and suffer the drift electric voltage small,and characteristics of line is good.78E58B is only a slice advantage for machine tool having from taking the procedure rom,not needing expanding the exterior rom.It’s clear that liquid crystal display(LCD) is a kind of manifestation,high dependable,the high life span,low cost,low price work the electric voltage’s display piece,extensive application is in the calculator every kind of instrument with the system inside of low cost application.
We use single-chip computer technology to design digital flowmeter. Firstly,use hall sensor to sense running frequency of turbine flowmeter. Secondly, use amplifier to amplify the weak frequency signal(analog signal) outputted by sensor, gating circuit is used to control measurement cycle. Then, use counter to translate the analog frequency signal into digital signal which can be processed by computer, and input to 78E58B single-chip computer. Use 78E58B singlechip computer comput frequency value, and find corresponding flow value of each frequency value through table. Lastly, LCD display system display the control and measurement information.
The system framework, hardware circuit design and software design of digital flowmeter are presented in the paper. The extensive application of flowmeter of arithmetic figure type produces in the industries to especially wait the realm with energy at the chemical engineering to liquid, air……etc. the fluid dischange processds to calculate.
Keywords: Digital flowmeter、 Flow、 Singlechip computer