moved to Apps

The Morse code idea is lovely! Having it one at a time makes it 20 signals long plus 3 gaps.

What about binary/hex? For digit by digit you only need 4 times 4 signals. For a 12hour pattern you need 11 and for 24hour pattern 12, so having the 12/24h pattern is the shortest. For hex you could use Morse code, that would be just one pattern at a max of 10 flashes and one gap.