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2. 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.

3. Chamberlain Group, Inc. v. Skylink Technologies, Inc. - Wikipedia

   en.wikipedia.org/wiki/Chamberlain_Group,_Inc._v...

   Chamberlain markets a "Security+" line of GDOs which includes rolling code software that actively alters the transmitted signal by cycling through a series of strings (of which only some are able to open the door). This rolling code is designed to protect against a potential "code grabbing" attack where a nearby burglar may try to record the ...

4. 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.

5. Electric eye - Wikipedia

   en.wikipedia.org/wiki/Electric_eye

   Electric eye for a garage door opener. An electric eye is a photodetector used for detecting obstruction of a light beam. An example is the door safety system used on garage door openers that use a light transmitter and receiver at the bottom of the door to prevent closing if there is any obstruction in the way that breaks the light beam.

6. News, Politics, Sports, Mail & Latest Headlines - AOL.com

   homepage.aol.com

   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.

7. Diagnostic program - Wikipedia

   en.wikipedia.org/wiki/Diagnostic_program

   Everyday examples are a microwave oven that displays code F6 to warn of a shorted temperature probe [1] or a garage door opener that flashes its control board's LED four times warning of critically misaligned safety sensors and impending shutdown. [2] Diagnostic programs are also inserted into consumer electronic products and electronic games.