| 摘要 |
A sensor system (30) detects the occurrence of angular rotation of a pivotable member (22), such as a door, relative to a fixed member (16), such as the base of a mailbox (10). The sensor system includes a sensor strip (34) positioned so as to change orientation when the door is opened or closed and generate an electrical signal. An RF transmitter (62) signals a receiver (60) at a remote location when the sensor strip registers the opening or closing. A filter (72) filters out noise to inhibit accidental signaling of door opening and/or closing when opening or closing has not occurred. A charge tuner (80) stores charge generated by the piezo-electric element to maintain the transmitter signal beyond the period of opening or closing.
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