[deaddabe]

Initially, I learned it for fun and ham radio emitting. But I find it fascinating that you can use it with anything that can be turned on and off with a rythm.

I used a flashlight to say "hello" while waiting for a fireworks event, but the other person far away just blinked their flashlight randomly in response.

I guess it could be used for worst scenario speech, like blinking eyes for examples if I ever have a terrible accident somehow (has been used by tortured persons, see https://www.youtube.com/watch?v=WZ256UU8xJ0). When I saw Tuco’s grandpa in Breaking Bad taking so much time to write words with his bell, I just tought about using morse (but with something more elaborate than a bell, because you want to use long and short tones; same problem applies if you want to knock on walls or doors).

[lupire]

Use double tones/knocks if you don't have long.

[wl]

This is a bad idea. You'll make a dah sound like two or three badly timed dits.

Copying morse code by ear is all about the rhythm. You can hear the rhythm just fine with simple knocks or taps.

[whoooooo123]

Then how do you distinguish between "long" and "two shorts"?

[wrycoder]

Original Morse telegraph was not done by tones.

The sounder emitted two clicks, subtlety different, for each key down/up event.

So, a dit would be two clicks with a short interval, while a dah would be two clicks with a longer (3x?) interval.

[BenjiWiebe]

Timing, I suppose. A double tone with much less than one dit's worth of spacing would be a dah.