San Morse

A Morse code app designed for learning while you write: it shows the Morse decision tree on screen as a guide, instead of requiring you to know the codes beforehand. It also converts text to Morse and plays it back.

The interface is English by default, with Spanish available as an option (Settings → Language).

Modes

Decision tree

The full dichotomic Morse tree is drawn on screen (E/T → I/A/N/M → …) and the OK button works as a telegraph key: while you hold it the tone plays and the LED lights up, and on release the symbol is decided by press duration:

Button	Action
OK quick release (<250 ms)	dot (·) — descend to the left branch
OK held	dash (−) — descend to the right branch
~1.5 s pause	commits the current node's letter (automatic)
~4 s pause	adds a space (automatic)
◄ Left	commit the letter now, without waiting
► Right	play back what you have written, in Morse
▲ Up	undo the last symbol; at the root, delete the last letter
▼ Down	manual space
Back	cancel the current letter; again to exit to the menu

The current node is shown inverted and its two children framed, so you always see which character the next dot or dash would give you. While holding OK, the symbol in the top-right corner switches from · to − when you cross the threshold, and a bar under the text shows the countdown to commit the letter (solid line) or the space (dotted line).

Numbers and signs live on level 5 of the tree (2 = ··−−−, 7 = −−···…). When you reach level 4 the view zooms into the subtree and shows them: digits 0–9 and the signs & + = / ( hang from the fourth-level positions (including the ones with no Latin letter, drawn as dots).

Text to Morse

Type a text with the Flipper keyboard and it is played back with sound, LED and vibration, highlighting the current character and symbol on screen.

During playback:

Button	Action
OK	pause / resume / replay
▲ / ▼	speed (5–35 WPM)
◄	sound on/off
►	vibration on/off
Back	stop and return

Settings

From the menu, persisted to the SD card (apps_data/san_morse):

Setting	Values
Language	English (default) / Español
Sound / Vibration / LED	on / off
Volume	25–100 %
Tone	440–800 Hz
Speed	5–35 WPM
Dash threshold	150–400 ms (how long to hold OK for a dash)
Commit letter	OFF (manual only, with ◄) or 0.8–3 s
Auto space	OFF or 2–8 s

Building

pip install --user ufbt
cd san-morse-flipper
ufbt          # produces dist/san_morse.fap

With the Flipper connected over USB: ufbt launch (builds, installs and opens the app). You can also copy dist/san_morse.fap to the SD card under apps/Tools/.

Built against the official (release) firmware. If you run a custom firmware (Momentum, Unleashed…), point ufbt at its SDK, e.g.: ufbt update --index-url=https://up.momentum-fw.dev/firmware/directory.json