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  2. Garage door opener - Wikipedia

    en.wikipedia.org/wiki/Garage_door_opener

    The electric overhead garage door opener was invented by C.G. Johnson in 1926 in Hartford City, Indiana. [1] Electric Garage Door openers did not become popular until Era Meter Company of Chicago offered one after World War II where the overhead garage door could be opened via a key pad located on a post at the end of the driveway or a switch inside the garage.

  3. Ladder paradox - Wikipedia

    en.wikipedia.org/wiki/Ladder_paradox

    This could be done, for instance, by not opening the exit door again after we close it. In the frame of the garage, we assume the exit door is immovable, and so when the ladder hits it, we say that it instantaneously stops. [1] [2] By this time, the entrance door has also closed, and so the ladder is stuck inside the garage. As its relative ...

  4. Rolling code - Wikipedia

    en.wikipedia.org/wiki/Rolling_code

    Remote controls send a digital code word to the receiver. If the receiver determines the codeword is acceptable, then the receiver will actuate the relay, unlock the door, or open the barrier. Simple remote control systems use a fixed code word; the code word that opens the gate today will also open the gate tomorrow.

  5. Swing-door operator - Wikipedia

    en.wikipedia.org/wiki/Swing-door_operator

    Swing side, door mounted sensor—mounted on the swing side of the door itself, used as the door is opening to detect a user in the way of the opening door. In that case, the operator stops the door. The sensitivity of infrared sensors must be reduced at the end of the opening angle, if it starts seeing a wall next to the door, so it may not ...

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  7. Radio receiver - Wikipedia

    en.wikipedia.org/wiki/Radio_receiver

    Remote control - Remote control receivers receive digital commands that control a device, which may be as complex as a space vehicle or unmanned aerial vehicle, or as simple as a garage door opener. Remote control systems often also incorporate a telemetry channel to transmit data on the state of the controlled device back to the controller.

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