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Ultrasonic distance measurement technology in the field of industrial field, vehicle navigation, underwater acoustic engineering has extensive application value. Now it has been used in level measurement, robot automatic navigation and air and underwater target detection, identification, location and other occasions. Therefore, it is very important to study the theory and method of ultrasonic distance measurement.

Two aspects of hardware and software are introduced in this paper. The hardware design of the system and implementation after comprehensive consideration and choice. This design scheme is selected using stc12c2052 as the main control system; ranging module according to trig and echo to send and receive data through the MCU, calculate the distance. The circuit also has a display part, the use of digital tube display. When the distance reaches the specified distance, the corresponding LED is bright, and the alarm is reached when the alarm distance is reached.

This design uses the general original, the cost is low, the utility is strong, the performance is reliable, the cost is high, the use plan is simple.

Key words: ultrasonic; distance measurement instrument; single chip microcomputer
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