new idea from the Roomba inventor. hell of an idea (if it works) 
http://bostinno.streetwise.co/2017/...cutting-robot-tertill-nears-kickstarter-goal/
Here's how it works: Tertill patrols the garden daily and when something short enough passes under its shell, a sensor activates the robot's weed cutter. If it runs into objects above the height threshold, it moves around them and continues to search for weeds. For plants that are short, plant collars are provided to protect them from accidental beheadings.
http://bostinno.streetwise.co/2017/...cutting-robot-tertill-nears-kickstarter-goal/
Here's how it works: Tertill patrols the garden daily and when something short enough passes under its shell, a sensor activates the robot's weed cutter. If it runs into objects above the height threshold, it moves around them and continues to search for weeds. For plants that are short, plant collars are provided to protect them from accidental beheadings.
