Measurement instrument of dam horizontal deformation  based on STM32

LEI Jia-ke1， ZHOU Yun-fei1， XIONG Huan2
（1. School of Mechanical Science & Engineering， Huazhong University of Science & Technology，
Wuhan 430074， China；  2. Wuhan National Laboratory for Optoelectronics， Wuhan 430074， China）

Abstract： Aiming at measuring the horizontal deformation of a dam accurately and efficiently to help monitoring dam safety，the plumb line principle was analyzed and a measuring instrument which adopted DC geared motor as the driving part and laser transmitters，phototransistors and a high-precision grating scale as the measuring elements was designed. STM32 was chosen as the microprocessor of the control system， multitasking operation system μC/OS-Ⅱ and multitasking graphical user interface μC/GUI were embedded into the STM32 platform，an interactive interface was designed based on them using TFTLCD touch screen. By means of manipulating the touch screen，the measurement could be accomplished automatically and manually. This manipulation of the touch screen could also be replaced either by measurement，and data collection was completed with the relative instruction from the remote PC management system based on the RS485 interface，or the transference and saving of the data by virtue of connecting the USB equipment at the site. The results indicate that the instrument is networked and can measure the dam deformation automatically and quickly with a good reproducibility.It can attain an accuracy of 0.01 mm.
Key words： dam horizontal deformation； measurement instrument； high-precision grating scale； multitasking