C Arduino Program to Build ASCII Text to Morse Code Translator on Command Line
/**
* Morse standard: International
* Credits: Luke Paris, Glenn van Driel <3
* Sources:
* [1] Flash functions: https://github.com/dylanmaes/Morse/blob/master/Morse_sender.ino
* [2] Morse standards: https://en.wikipedia.org/wiki/Morse_code
*/
// Defined led pin
#define PIN_LED 13
// All morse delays
#define MORSE_DELAY 200
#define MORSE_DELAY_DOT (MORSE_DELAY * 1)
#define MORSE_DELAY_DASH (MORSE_DELAY * 3)
#define MORSE_DELAY_SPACE (MORSE_DELAY * 7)
// All morse characters
#define MORSE_DOT '.'
#define MORSE_DASH '-'
/**
* All morse letters
* @var *char[]
*/
char* MORSE_LETTERS[] = {
".-", // A
"-...", // B
"-.-.", // C
"-..", // D
".", // E
"..-.", // F
"--.", // G
"....", // H
"..", // I
".---", // J
"-.-", // K
".-..", // L
"--", // M
"-.", // N
"---", // O
".--.", // P
"--.-", // Q
".-.", // R
"...", // S
"-", // T
"..-", // U
"...-", // V
".--", // W
"-..-", // X
"-.--", // Y
"--.." // Z
};
/**
* All morse numbers
* @var *char[]
*/
char* MORSE_NUMBERS[] = {
"-----", // 0
".----", // 1
"..---", // 2
"...--", // 3
"....-", // 4
".....", // 5
"-....", // 6
"--...", // 7
"---..", // 8
"----." // 9
};
/**
* Setup function
* Initialize communication with the serial monitor
* @returns void
*/
void setup() {
pinMode(PIN_LED, OUTPUT);
Serial.begin(9600);
}
/**
* Loop function
* Code runs forever until the arduino dies
*
* How the code figures out the position of the character:
*
* If you send: "Hello" it starts with "H"
* H = 0x48 (decimal: 72)
* A = 0x41 (decimal: 65)
*
* 72 - 65 = 7
*
* 7th in the alphabet = H
* MORSE_LETTERS[7] = H = ....
*
* @returns void
*/
void loop() {
// Current character sent from the serial
char current;
// Is there anything to be read from USB?
if (Serial.available()) {
// Read a single letter
current = Serial.read();
// Lower case letters
if (current >= 'a' && current <= 'z') {
flashSequence(MORSE_LETTERS[current - 'a']);
}
// Capital case letters
else if (current >= 'A' && current <= 'Z') {
flashSequence(MORSE_LETTERS[current - 'A']);
}
// Numbers
else if (current >= '0' && current <= '9') {
flashSequence(MORSE_NUMBERS[current - '0']);
}
// Space character (3500 ms)
else if (current == ' ') {
delay(MORSE_DELAY_SPACE);
}
// Print output back
if (current == '\0') {
Serial.println("");
} else {
Serial.print(current);
}
}
}
/**
* Flash a sequence of characters
* @param char* sequence
* @returns void
*/
void flashSequence (char* sequence) {
// Counter
int i = 0;
// Loop through every character until an 'end-of-line' (null) character is found
while (sequence[i] != '\0') {
flashDotOrDash(sequence[i]);
i++;
}
// Delay between every letter
delay(MORSE_DELAY * 3);
}
/**
* Flash a single character
* @param char
* @returns void
*/
void flashDotOrDash (char unit) {
// Turn led on
digitalWrite(PIN_LED, HIGH);
// Unit is a dot (500 ms)
if (unit == MORSE_DOT) {
delay(MORSE_DELAY_DOT);
}
// Unit is a dash (1500 ms)
if (unit == MORSE_DASH) {
delay(MORSE_DELAY_DASH);
}
// Turn led off and add a delay between a dot and dash (500)
// Inter-element gap
digitalWrite(PIN_LED, LOW);
delay(MORSE_DELAY);
}
