sos.ino

// Pin 13 has an LED connected on most Arduino boards.
// Pin 11 has the LED on Teensy 2.0
// Pin 6  has the LED on Teensy++ 2.0
// Pin 13 has the LED on Teensy 3.0
// give it a name:
int led = 13;


// set up morse code timeings...
int base_time = 100;             // 200 ms base speed ~ 24 wpm
int dot_time = base_time;        // same as base speed
int dash_time = base_time * 3;   // 3 times the dot length
int elem_pause = base_time;      // same as base speed/dot time
int char_pause = base_time * 3;  // pause between chars is 3 times base
int word_pause = base_time * 7;  // pause between words is 7 times base


// the setup routine runs once when you press reset:
void setup() {                
    // initialize the digital pin as an output.
    pinMode(led, OUTPUT);     
}

// the loop routine runs over and over again forever:
void loop() {
    print_sos();    
}

void print_sos() {
    flash_s();
    flash_o();
    flash_s();
    end_word();
}

void flash_a() {
    dot();
    dash();
    end_char();
}

void flash_b() {
    dash();
    dot();
    dot();
    dot();
    end_char();
}

void flash_c() {  
    dash();
    dot();
    dash();
    dot();
    end_char();
}

void flash_d() {
    dash();
    dot();
    dot();
    end_char();
}

void flash_e() {
    dot();
    end_char();
}

void flash_f() {
    dot();
    dot();
    dash();
    dot();
    end_char();
}

void flash_g() {
    dash();
    dash();
    dot();
    end_char();
}

void flash_h() {
    dot();
    dot();
    dot();
    dot();
    end_char();
}

void flash_i() {
    dot();
    dot();
    end_char();
}

void flash_j() {
    dot();
    dash();
    dash();
    dash();
    end_char();
}

void flash_k() {
    dash();
    dot();    
    dash();
    end_char();
}

void flash_l() {
    dot();
    dash();
    dot();
    dot();
    end_char();
}

void flash_m() {
    dash();
    dash();
    end_char();
}

void flash_n() {
    dash();
    dot();
    end_char();
}

void flash_o() {
    dash();
    dash();
    dash();
    end_char();
}

void flash_p() {
    dot();
    dash();
    dash();
    dot();
    end_char();
}

void flash_q() {
    dash();
    dash();
    dot();
    dash();
    end_char();
}

void flash_r() {
    dot();
    dash();
    dot();
    end_char();
}

void flash_s() {
    dot();
    dot();
    dot();
    end_char();
}

void flash_t() {
    dash();
    end_char();
}

void flash_u() {
    dot();
    dot();
    dash();
    end_char();
}

void flash_v() {
    dot();
    dot();
    dot();
    dash();
    end_char();
}

void flash_w() {
    dot();
    dash();
    dash();
    end_char();
}

void flash_x() {
    dash();
    dot();
    dot();
    dash();
    end_char();
}

void flash_y() {
    dash();
    dot();
    dot();
    dash();
    end_char();
}

void flash_z() {
    dash();
    dash();
    dot();
    dot();
    end_char();
}


/*
void flash_1() {
}

void flash_2() {
}

void flash_3() {
}

void flash_4() {
}

void flash_5() {
}

void flash_6() {
}

void flash_7() {
}

void flash_8() {
}

void flash_9() {
}

void flash_0() {
}
*/


void dash() {
    // flash a dash (dah)
    digitalWrite(led, HIGH);
    delay(dash_time);
    digitalWrite(led, LOW);
    delay(elem_pause);
}

void dot() {
    // flash a dot (dit)
    digitalWrite(led, HIGH);
    delay(dot_time);
    digitalWrite(led, LOW);
    delay(elem_pause);
}

void end_char() {
    // end a char
    // subtract the base time becuase of the element delay
    delay(char_pause - base_time);
}

void end_word() {
    // end a word
    // subtract the base time becuase of the element delay
    delay(word_pause - base_time);
}