基于单片机的超声波测距电路设计

ccording to the principle of ultrasonic transmission in the air and taking the ultrasonic transducer as the interface unit, an ultrasonic distance tester based on AT89C51 MCU is introduced. This tester is characteristed with advantagers such as low-cost, high accuracy and flexible volume. The system is composed of the ultrasonic wave generating module, the signal receiving module, the MCU processing module, the LED digital display, acousto-optic warning display module and so on. In the paper, the tester\'s hardware composition, the testing principle, the testing method and the software structure are introduced in detail. The range of the largest measuring distance is 3 meters, accuracy is 1 cm. Besides the system has a low cost, non-contact, high speed, high precision, reliability, adaptability, and easy to operate, etc.