88 also shown in this figure is the scheme to provide entry onto an sr floor in a natural fashion this is achieved by extending the sensor floor by one panel 16 tiles in the m direction beyond the active u201c rain u201d region as a person 92 walks over this sensor floor extension 90 senses the visitor 39 s feet directly and starts to form a dry zone 94 even before he or she enters the u201c rain u201d area if m and n limits were a nominal 40 for a 1600 tile floor the m coordinate limit is now simply extended to 44 fig1 shows a physical view of a sensor floor tile 100 with a slightly domed force sensing central area 118 surrounded by grooves 120 which allow water to flow through these tiles 100 plug into each other on two orthogonal edge axes the address m and n busses and power lines are created through coaxial connectors at the edges the bottom portion is stepped down to permit connection to the edge of a square panel frame without interference with the plugability of tiles from one panel to an adjacent one threaded holes 116 permit attachment to these panel frames while they are unused on the more central tiles away from the edge of a panel hole 106 houses the female m bus connector while the male counterpart 108 extends from the opposite edge with o ring 114 sealing the connection to the.