To avoid personal injury

a new intelligent controller for greenhouse rolling machine is developed. Using MCU chip AT89S52 as the kernel of the system

a flat plate is placed horizontally close to the edge of the rolling track whose position will be altered when human body get entangled in. Ultrasonic senor is adopted for real-time positioning of the flat plate

location information is collected by MCU to judge whether the emergency brake should be carried out. The controller also possesses the function of daily rolling

over-temperature monitoring and SMS notification through GSM network. The composition and structure of the control system is described from the viewpoint of hardware and software. Experimental results verify the effectiveness of the design.