Use ultrasonic module to measure distance and display on four section digital tube

超声波测距（数码管显示）\main.c
超声波测距（数码管显示）\Uitr
超声波测距（数码管显示）\Uitr.hex
超声波测距（数码管显示）\Uitr.uvopt
超声波测距（数码管显示）\Uitr.uvproj
超声波测距（数码管显示）

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