Lawn Analyzer

Abstract: This thesis is a demonstrator on the question if measurements of grass height of a lawn can be sampled with a custom;built sensor unit. These samples are put to validation on their accuracy and application. Applying theory and research on data accusation, hardware components and robot control, this thesis presents information regarding the necessary hardware and software to construct a platform fit for this task. Creation of a web service also facilitates as the control system for the demonstrator, which provides manual control, diagnostics and data output logging to the end user. The proposed design solution for the sensor uses optical infrared barriers to detect straws of grass and motion sensing circuits to provide feedback on object detection. This design solution was developed with requirements and specifications that derive from examination of the restrictions that accommodate commercial robotic lawnmowers. Results from the demonstrator shows that the required height resolution can be established with the design. The tolerances from the first functional tests conform throughout the validation and provide proof that the design solution is operational for the stated purpose. The height data output is discussed as feedback in scheduling and path planning of robotic lawnmowers, where more advanced control systems could enable more efficient use of resources in tomorrow’s appliances.