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  2. Garage door opener - Wikipedia

    en.wikipedia.org/wiki/Garage_door_opener

    Limit switches on the power unit control the distance the garage door opens and closes once the motor receives a signal from the remote control or wall push button to operate the door. [3] The entire assembly hangs above the garage door. The power unit hangs from the ceiling and is located towards the rear of the garage.

  3. Switch - Wikipedia

    en.wikipedia.org/wiki/Switch

    A "push-to-break" (or normally-closed or NC) switch, on the other hand, breaks contact when the button is pressed and makes contact when it is released. An example of a push-to-break switch is a button used to release a door held closed by an electromagnet. The interior lamp of a household refrigerator is controlled by a switch that is held ...

  4. Light switch - Wikipedia

    en.wikipedia.org/wiki/Light_switch

    Vintage push-button light switches. The push-button light switch has two buttons: one that closes the contacts and one that opens the contacts. Pushing the raised button opens or closes the contacts and pops out the previously depressed button so the process can be reversed. In the U.S., the buttons were commonly black; the "on" button ...

  5. Limit switch - Wikipedia

    en.wikipedia.org/wiki/Limit_switch

    A limit switch mounted on a moving part of a bridge. In electrical engineering, a limit switch is a switch operated by the motion of a machine part or the presence of an object. A limit switch can be used for controlling machinery as part of a control system, as a safety interlock, or as a counter enumerating objects passing a point. [1]

  6. DIP switch - Wikipedia

    en.wikipedia.org/wiki/DIP_switch

    DIP switch. A slide-style DIP switch soldered into a printed circuit board (PCB) A DIP switch is a manual electric switch that is packaged with others in a group in a standard dual in-line package (DIP). The term may refer to each individual switch, or to the unit as a whole. This type of switch is designed to be used on a printed circuit board ...

  7. Remote keyless system - Wikipedia

    en.wikipedia.org/wiki/Remote_keyless_system

    A remote control for a keyless entry system built into an ignition key: pressing a button on the key unlocks the car doors, while another button locks the car and activates its alarm system. A remote keyless system (RKS), also known as remote keyless entry (RKE) or remote central locking, is an electronic lock that controls access to a building ...

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