The discussion of a standardized system is very valuable.  I believe the closer
it gets to being a "turnkey" system, the more it will appeal to high school
teachers who have no extra time to spend on maintenance.

Finding a good place for the sensor can be tricky.  Some schools are using
temporary trailers for classrooms.  Others (like my son's school in San Jose
where I maintained a system for 2 years) have very springy floors built over a
large crawl space.  We ended up putting the sensor on concrete blocks in the
crawl space - to which the only entrance was an 18" square trap door in the
floor of a closet.  This leads me to believe that PSN members should serve a
consulting role, assessing the situation before inviting a teacher or school to
commit time or funds.

Ted



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