Research On Ultrasonic Range Finder Based On Bus

Distance measurement by ultrasonic is an effective and noninvasive method, and it can be used in a great variety kinds of fields that need to find range or ascertain location parameters. In recent years, it has been put forward more and more higher requirement to the accuracy, range, extent and anti-interference of the range-find system, and the technology of ultrasonic range finder is also improving and developing itself gradually. Range finders tend to become intellectualized and miniaturized; it means that they have high precision, reliability, safety and multifunction. The function of the traditional ultrasonic range finders are only limited on distance measure, they cannot meet the need of the modern test system. An ultrasonic range finder is designed in this paper, and several kinds of network interfaces are also developed for the sake of expansion. The range finder could be connected to computers by its network interface and the results of the measurements can be processed and analyzed by the computer; Futhermore, the datas of the measurements can be shared by the internet. This will reduce the intensity and improve the efficiency of people's work.A particular introduction of the physical characteristic of the ultrasonic and the principle of the ultrasonic range finder are given in the paper, in addition, the feasibility analysis of using the method of impulse transmission is done also. The MSP430 microcontroller is choosen to perform as the controller of the system in the interest of the system's low power dissipation. And the function of each software module is also described. A thorough analyses to the interferer and the factors that might influence the precision of the system is put up, moreover, the results of the instrment is improved by corresponding innovative approach. Such bus interface as RS485, USB, wireless and Ethernet are also designed in the paper for the convenience of further data processing and the application to remote monitoring. What's more, the range finder also can be used as additional equipment in other systems.