Author(s)

Chaoyi Liu

Corresponding Author

Chaoyi Liu

ABSTRACT

Non contact object shape measurement has a very wide application prospect in the industrial field. The non-contact measurement method will effectively improve the efficiency of factory measurement. In this design, STM32F103C8T6 minimum core is used as the main control module.The system consists of distance module, OPENMV module, steering gear pan tilt module, OLED display module, key module and power module. The system processes the image through openmv, and the control board will use the coordinate information to control and regulate the steering gear through PWM to make it reach the target position; In the aspect of measurement, based on the principle of camera aperture imaging, the specific size of the object is calculated, and then the parameter information is sent to the OLED display; PID algorithm is used in the control mode. The proportional link has fast response, the integral link has no static error, and the differential link reduces overshoot and speeds up the dynamic response. The camera can be well moved to the center of the target. After the later test, the system collects the shape, size, distance and other parameters of the plane target, which can automatically find the target and measure the three-dimensional target; The performance of the system is reliable and the technical indexes meet the design requirements.

KEYWORDS

Non contact object, PID control, machine vision, OpenMV