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  2. Charlieplexing - Wikipedia

    en.wikipedia.org/wiki/Charlieplexing

    A Charlieplexed digital clock which controls 90 LEDs with 10 pins of a PIC 16C54 microcontroller.. Charlieplexing (also known as tristate multiplexing, reduced pin-count LED multiplexing, complementary LED drive and crossplexing) is a technique for accessing a large number of LEDs, switches, micro-capacitors or other I/O entities, using relatively few tri-state logic wires from a microcontroller.

  3. Tom W. Davis Tower - Wikipedia

    en.wikipedia.org/wiki/Tom_W._Davis_Tower

    The Tom W. Davis Tower is a clock tower at Ohio State University in Columbus, Ohio. It is located near the North Recreation Center and features a 20-by-40-foot (6.1 m × 12.2 m) light-emitting diode display and a large clock. It was completed in autumn of 2017.

  4. List of largest clock faces - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_clock_faces

    A list of permanent working clocks with the largest faces in the world. Entries include all clocks with faces at least 4 m (13 ft) in diameter. Clocks can be located on the exterior or interior of buildings, and towers as well as on the ground as is the case with floral clock faces.

  5. Digital clock - Wikipedia

    en.wikipedia.org/wiki/Digital_clock

    A digital clock's display changing numbers. To represent time, most digital clocks use a seven-segment LED, VFD, or LCD for each of the four digits. They generally also include other elements to indicate whether the time is AM or PM, whether or not an alarm is set, and so on. Older digital clocks used numbers painted on wheels, or a split-flap ...

  6. Projection clock - Wikipedia

    en.wikipedia.org/wiki/Projection_clock

    A projection clock usually needs a backlight like an incandescent bulb or LED.. There are low-brightness and high-brightness clocks. While the projection created by low-brightness clocks can be viewed only in a darkened room, high-brightness ones can also be viewed in bright light or daylight.

  7. List of tallest clock towers - Wikipedia

    en.wikipedia.org/wiki/List_of_tallest_clock_towers

    Bell Tower (original) Clock & Bell Tower (current) USA: Springfield, Massachusetts: Currently not open to the public. With the addition of the clock now the third tallest freestanding clock tower in the world [50] 35: Belfry of Ghent: 91 m (299 ft) 4: Yes: 1543: Tower Building: Clock Tower/Belfry: Belgium: Ghent

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