Description: Ultrasonic ranging system design uses modular software design, by the main program, launched Subroutine, Subroutine search蟓receive regular subroutine, subroutines, such as display modules. The main program of the system at work keying cycle, when the press measurement key, the main program to launch the beginning of subroutine calls, inquiries receive subroutine, time subroutine, and the measurement results show the subroutines used in liquid crystal display screen . As the LCD I want to use the same P3, it is necessary to use bit operation, or they will not lead to the normal LCD display. Also can be added in the system temperature sensor to monitor ambient temperature, the temperature can be outstanding. In order to enhance the reliability of the system hardware and software should be used in anti-jamming measures.
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