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ABSTRACT

The design introduces the principle of the ultrasonic distance measurement instrument based on SCMC-controlled: AT89C51 controls timers to produce the ultrasonic wave pulse and time,count the time of ultrasonic wave spontaneous emission to receive round-trip,thus obtains the measured distance.And the temperature compensation adjustment is used in the data processing, with four LED nixie tubes display distance or temperature by switching.

The entire this of the system constitution, the circuitry and the programming. The instrument system , and distinctness of programme process ,etc. After the realization of the works can be used for needs of the various parameters measured distance applications.

Keywords:AT89C51, Ultrasonic wave, Temperature compensation, Measure distance