| 摘要 |
The garage door position indicator contains a radio frequency (RF) transmitter with an electronic angle sensor attached onto a garage door, and a RF receiver with a visual/audio indicator. The electronic angle sensor supplies signals to the RF transmitter during the changes in orientation of a garage door from vertical to horizontal and from horizontal to vertical. The RF receiver is responsive to the RF signals from the RF transmitter and controls a visual/audio indicator to indicate the position of a garage door accordingly.
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