一种基于单片机的棉花打顶高度控制系统,采用超声波和传感器进行株高测量,包括控制模块、株高测量装置、速度感应装置、升降装置和打顶装置。(A cotton top cutting height control system based on single chip microcomputer, which adopts ultrasonic wave and sensor to measure height of the plant, including control module, height measuring device, speed induction device, lifting device and topping device.)