Character Table

Overview

This reference table contains all character-to-Morse code mappings used by MorseIt. The mappings are extracted directly from the translateToMorse() method in MainActivity.java.

Alphabet Characters

Letters A-Z

MorseIt supports both uppercase and lowercase letters, which map to identical Morse code sequences.

Character	Morse Code	Character	Morse Code
A / a	`.-`	N / n	`-.`
B / b	`-...`	O / o	`---`
C / c	`-.-.`	P / p	`.--.`
D / d	`-..`	Q / q	`--.-`
E / e	`.`	R / r	`.-.`
F / f	`..-.`	S / s	`...`
G / g	`--.`	T / t	`-`
H / h	`....`	U / u	`..-`
I / i	`..`	V / v	`...-`
J / j	`.---`	W / w	`.--`
K / k	`-.-`	X / x	`-..-`
L / l	`.-..`	Y / y	`-.--`
M / m	`--`	Z / z	`--..`

Case-insensitive: Both ‘A’ and ‘a’ translate to the same Morse code pattern.

Numeric Characters

Digits 0-9

All ten digits are supported with standard International Morse Code patterns.

Digit	Morse Code	Pattern Description
0	`-----`	Five dashes
1	`.----`	One dot, four dashes
2	`..---`	Two dots, three dashes
3	`...--`	Three dots, two dashes
4	`....-`	Four dots, one dash
5	`.....`	Five dots
6	`-....`	One dash, four dots
7	`--...`	Two dashes, three dots
8	`---..`	Three dashes, two dots
9	`----.`	Four dashes, one dot

Show Number Pattern Observation

Notice the symmetric pattern:

Numbers 1-5: Increasing dots, decreasing dashes
Numbers 6-9,0: Increasing dashes, decreasing dots

Punctuation Marks

MorseIt supports four punctuation characters:

Character	Name	Morse Code
.	Period/Full stop	`.-.-.-`
,	Comma	`--..--`
?	Question mark	`..--..`
=	Equals sign	`-...-`

Source Code Mapping

The character mappings are defined in MainActivity.java:66-131:

Show Complete HashMap Implementation

// Uppercase letters
map.put('A', ".-");
map.put('B', "-...");
map.put('C', "-.-.");
map.put('D', "-..");
map.put('E', ".");
map.put('F', "..-.");
map.put('G', "--.");
map.put('H', "....");
map.put('I', "..");
map.put('J', ".---");
map.put('K', "-.-");
map.put('L', ".-..");
map.put('M', "--");
map.put('N', "-.");
map.put('O', "---");
map.put('P', ".--.");
map.put('Q', "--.-");
map.put('R', ".-.");
map.put('S', "...");
map.put('T', "-");
map.put('U', "..-");
map.put('V', "...-");
map.put('W', ".--");
map.put('X', "-..-");
map.put('Y', "-.--");
map.put('Z', "--..");

// Lowercase letters
map.put('a', ".-");
map.put('b', "-...");
map.put('c', "-.-.");
map.put('d', "-..");
map.put('e', ".");
map.put('f', "..-.");
map.put('g', "--.");
map.put('h', "....");
map.put('i', "..");
map.put('j', ".---");
map.put('k', "-.-");
map.put('l', ".-..");
map.put('m', "--");
map.put('n', "-.");
map.put('o', "---");
map.put('p', ".--.");
map.put('q', "--.-");
map.put('r', ".-.");
map.put('s', "...");
map.put('t', "-");
map.put('u', "..-");
map.put('v', "...-");
map.put('w', ".--");
map.put('x', "-..-");
map.put('y', "-.--");
map.put('z', "--..");

// Digits
map.put('0', "-----");
map.put('1', ".----");
map.put('2', "..---");
map.put('3', "...--");
map.put('4', "....-");
map.put('5', ".....");
map.put('6', "-....");
map.put('7', "--...");
map.put('8', "---..");
map.put('9', "----.");

// Punctuation
map.put('.', ".-.-.-");
map.put(',', "--..--");
map.put('?', "..--..");
map.put('=', "-...-");

Unsupported Characters

Any character not in the mapping table will be passed through unchanged in the output.

Unsupported characters include:

Most special symbols (!, @, #, $, %, etc.)
Spaces (passed through as spaces)
Accented letters (é, ñ, ü, etc.)
Non-Latin scripts

Fallback Behavior

When an unsupported character is encountered:

String fetchedChar = map.get(upperChar);
if (fetchedChar != null) {
    morse_code.append(map.get(upperChar));  // Supported: add Morse code
} else {
    morse_code.append(input_field_text.charAt(i));  // Unsupported: keep original
}

Character Statistics

Category	Count	Characters
Uppercase Letters	26	A-Z
Lowercase Letters	26	a-z
Digits	10	0-9
Punctuation	4	. , ? =
Total Mappings	66	-

The HashMap contains 88 total entries due to duplicate mappings for uppercase and lowercase letters.

International Morse Code Compliance

All character mappings in MorseIt follow the International Morse Code (ITU-R M.1677-1) standard for letters and digits. The punctuation marks also follow standard conventions.

Quick Reference by Pattern Length

Show Characters by Morse Code Length

Single Symbol

E: .
T: -

Two Symbols

I: ..
A: .-
N: -.
M: --

Three Symbols

S: ...
U: ..-
R: .-.
W: .--
D: -..
K: -.-
G: --.
O: ---

Four Symbols

H: ....
V: ...-
F: ..-.
L: .-..
P: .--.
J: .---
B: -...
X: -..-
C: -.-.
Y: -.--
Z: --..
Q: --.-

Five Symbols

5: .....
4: ....-
3: ...--
2: ..---
1: .----
6: -....
7: --...
8: ---..
9: ----.
0: -----
=: -...-

Six Symbols

.: .-.-.-
,: --..--
?: ..--..

Get Started

User Guide

Development

Reference

Character Table

Overview

Alphabet Characters

Letters A-Z

Numeric Characters

Digits 0-9

Punctuation Marks

Source Code Mapping

Unsupported Characters

Fallback Behavior

Character Statistics

International Morse Code Compliance

Quick Reference by Pattern Length

Single Symbol

Two Symbols

Three Symbols

Four Symbols

Five Symbols

Six Symbols

Build docs developers (and LLMs) love

Get Started

User Guide

Development

Reference

​Overview

​Alphabet Characters

​Letters A-Z

​Numeric Characters

​Digits 0-9

​Punctuation Marks

​Source Code Mapping

​Unsupported Characters

​Fallback Behavior

​Character Statistics

​International Morse Code Compliance

​Quick Reference by Pattern Length

​Single Symbol

​Two Symbols

​Three Symbols

​Four Symbols

​Five Symbols

​Six Symbols

Build docs developers (and LLMs) love

Overview

Alphabet Characters

Letters A-Z

Numeric Characters

Digits 0-9

Punctuation Marks

Source Code Mapping

Unsupported Characters

Fallback Behavior

Character Statistics

International Morse Code Compliance

Quick Reference by Pattern Length

Single Symbol

Two Symbols

Three Symbols

Four Symbols

Five Symbols

Six Symbols