This article elaborated one kind of use monolithic integrated circuitis the main part, through the software programming realizationultrasonic ranging simple electric circuit, core component uses thelow voltage which ATML Corporation produces, high performance CMOS8position monolithic integrated circuit - AT89C51. First used thedetailed writing and the picture in the article introduced theultrasonic ranging principle, simultaneously to the ultrasonic wavetransmission circuit, the accepting circuit and the display circuitprinciple of work carried on the introduction, and described severalimportant parts LM358, the LM567 principle of work and the performancewhich the hardware electric circuit constituted, LM567 was theachievement chooses the frequency electric circuit, output thenegative pulse in the pin to trigger the monolithic integrated circuitthe interrupt routine, finally realized the control function; TheLM358 interior includes two to be independent, the high gain, internalfrequency correction double operational amplifier, may dock theultrasonic wave transformation electrical signal realization voltageamplification which receives. The article has partially carried on thedetailed narration to the system software design, this mainlyincluding below part: Program flow diagram, main program.
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