AVR Digital Clock with Roman Numerals




This digital clock project will display a Roman number instead Hindu-Arabic numeral system (1,2,3... ). The project uses micro ATTINY2313 as main processor and LCD to display the clock. When you turn on the device, it will shows a screen flashes "Tempera tempus" as reminder to adjust the time.


The adjustment is done via the small button.
  • Press and hold the button for about 3 seconds -> hours appear on the screen -> release the button.
  • Press the button again and hold -> the hours advance from "I" to "XXIV" -> release the button on the time right.
  • Wait about 3 seconds -> minutes to appear on the screen.
  • Press the button and hold -> the minutes advance from "nothing" to "LIX" -> release on just minutes.

    Unfortunately, you have to readjust the time after your turn off the power, because there is no RTC in this  project.

    Download schematic and source code here
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