Ultrasonic Distance Measurement System Based On MCU

The thesis introduces a kind of single-pulse-reflection ultrasonic distancemeter system in detail based on microcontroller. The system could measure certain distance with the time between transmit wave and reflected wave on condition in which the speed of transmitting wave is fixed. It is easy to be installed and applied, low in price and capable of being used in combination with telemetering telecontrol system and has extensive application prospects.The scheme of each part is designed to acquire better performance of the system. In order to meet the different distance range, it arranges two transmitting modes in microcontroller: hign gain reflected wave to far mode with thirty two pulses, while low gain reflected wave to near mode with eight pulses. We get optimum receiver that is based on the characters of the receiving waves.This paper summarizes the development and foundational principle of ultrasonic detection. Then it presents the working mechanization and characters of ultrasonic sensor. At the same time, it discusses a number of main technical parameters. Moreover, it proposes the whole structure of the system by introducing the function of ultrasonic distancemeter. And then the transmission, receiver, detection, display scheme of this distancemeter system is brought out. Specially, after the application of AT89S51 microcontroller, it analyzes the hardware and software realization of each part in this system. At last the result and error analysis of the experiments is presented.It is proved by experiments that the design of the system is provided with high accuracy and reliability. In the end, the further measures of modification are presented.