You can get carbon impregnated foam material whose resistance changes when compressed. You could put the hives on that, but accuracy, range and rain may be an issues. I suppose the foam could be placed inside an impermiable coating.
You can get carbon impregnated foam material whose resistance changes when compressed. You could put the hives on that, but accuracy, range and rain may be an issues. I suppose the foam could be placed inside an impermiable coating.