Garage door remote monitoring system

摘要

A remote monitoring system for determining and transmitting information indicating the status of a door movable to a plurality of positions or alternatively, an alarm system includes sensor for determining each position of a door and providing output signals indicative of each position detected, a transmitter responsive to the output signal and repetitively transmitting a broadcast signal indicative of the output signal received, a first timer operatively connected to the transmitter means for selectively controlling periodic transmission of the broadcast signal in accord with first time intervals as established by the first timer means. A receiver receives the broadcast signal and includes a second timer for periodically energizing the receiver at predetermined second time intervals as established by the second timer to allow for reception of the broadcast signal. Energy management includes synchronization circuitry, which synchronizes the energization of the receiver means with the transmission of the broadcast signal by the transmitter means. The synchronizing circuitry is responsive to the reception of a broadcast signal by the receiver and includes the capability for selectively resetting the second timer in response to the reception of the broadcast signal to provide that the second time intervals occur substantially with the first time intervals.