Lawrence.L wrote:
>Y'know, with all this talk about optical sensors, keep this in mind: Cutting
>grass is a dirty job.  If you are not careful, any optical sensor is going
>to soon be covered in gook.
...........


Tiny "windshield" wipers.
Or tiny eyelids.
Or mount the sensor on a servo and pan to limit to squeegee the lens.
Or mount the sensor in a clear plastic hemisphere and dribble water
  down out of a bucket to keep the surface clean - plus water the
  grass at the same time - drain comes out "behind" the mower.
Or have the mower come over to its hutch every few passes for a
  lens cleaning.
Or have the sensor retractable into a box with auto cleaning as it
  goes in and out.
Or only mow on rainy days.

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