| This paper primarily investigates a kind of ultrasonic range finder based on microprocessor. This device can measure certain distance with reflected wave on condition that the speed of transmitting wave is fixed. It generally specifies the theoretical foundation of the device, introduces the software and hardware design of the device and correlative experiments. The design of the range finder is targeted on high precision and little blind area. In order to raise the device's precision, it takes measures such as temperature compensation. And the application of automatic gain control circuit decreases the device's blind area. It composes several experiments aimed at the features of the device such as being affected by the temperature changing, introduces and analyzes the experimental contents.
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