Design of Ultrasonic Range Finder Based on STM32 Single Chip Computer

On the basis of analyzing the principle of ultrasonic ranging, using STM32 single-chip microcomputer as the control core, using the transit time detection method, using the HC-SR04 ranging module, an ultrasonic wave with voice broadcast, over-range alarm, liquid crystal display and wireless communication functions is realized range-finder. Circuit design includes ranging, display, sensor, voice alarm and communication design; subprogram design includes ranging, display, voice alarm, and wireless communication. Through debugging and measurement, it is shown that the measurement accuracy of the range-finder is up to 1cm, the detection range is up to 340cm, and the measurement results can be voiced and wirelessly transmitted.