| 摘要 |
A tilt sensor apparatus ( 36 ) includes one or more tilt sensors ( 42 ). Each tilt sensor ( 42 ) includes a conductive element ( 64 ) entrapped within an opening ( 46 ) formed through a middle planar substrate ( 38 ). The opening is surrounded by an opening wall ( 52 ) which is entirely covered by a conductor ( 54 ). A conductive star pattern ( 100 ') is formed on a top planar substrate ( 40 ), and a conductive star pattern ( 100 '') is formed on a bottom planar substrate ( 44 ). The star patterns ( 100 ) are positioned at opposing ends of the opening ( 46 ). The conductive element moves within the opening ( 46 ) as the apparatus ( 36 ) is tilted. An interrupt-driven control circuit ( 124 ) is configured to indicate a change in orientation only when a short is first detected across a contact pair ( 54/56, 54/60 ) that corresponds to an orientation opposite to a currently-indicated orientation.
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