Description: Ultrasonic transmitter to the ultrasonic transmitter in one direction, while the launch time of start time, ultrasonic propagation in the air, on the way to return immediately encountered obstacles, the ultrasonic reflected wave received by the receiver to immediately stop the clock. Ultrasonic propagation velocity in air is 340m/s, according to the timer records the time t, we can calculate the emission from the pitch obstacle (s), ie: s = 340t/2. This is called time difference ranging method.
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超声波测距（数码管显示）\1111.plg
........................\1111.c
........................\1111.lnp
........................\1111.M51
........................\1111.hex
........................\1111_Uv2.Bak
........................\1111.Uv2
........................\1111_Opt.Bak
........................\1111.LST
........................\1111.OBJ
........................\1111
........................\1111.Opt
超声波测距（数码管显示）
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