This Arduino sketch implements a clock with three different display formats:
- Ordinary hours, minutes, and seconds
- Hexadecimal time, 0x000 to 0xFFFF
- Decimal or percentage time, 00.00 to 99.99
The actual display will be added later as four 7-segment digits.
The display will work with any type of 7-segment display, e.g. vacuum fluorescent, LED, LCD, Panaplex, Numitron, electromechanical flip-type. If we add octal times (0000-7777) then the display will be compatible with Nixie tubes, edge-lit digits, projection displays, and any other type of decimal (0-9) digit displays.
Some Numitron displays have Russian Postcode digits, with two additional diagonal segments within the usual 7-segment arrangement.
| Ordinary | Hexadecimal | Octal | Percentage |
|---|---|---|---|
| 00:00:00 | 0000 | 0000 | 00.00 |
| 03:00:00 | 2000 | 1000 | 12.50 |
| 06:00:00 | 4000 | 2000 | 25.00 |
| 09:00:00 | 6000 | 3000 | 37.50 |
| 12:00:00 | 8000 | 4000 | 50.00 |
| 15:00:00 | A000 | 5000 | 62.50 |
| 18:00:00 | C000 | 6000 | 75.00 |
| 21:00:00 | E000 | 7000 | 87.50 |
| 23:59:59 | FFFF | 7777 | 99.99 |