#define BUTTON_PIN 9
#define LED_PIN 2

uint16_t TIME_UNIT=200;
uint16_t DOT_DELAY=1*TIME_UNIT;
uint16_t DASH_DELAY=3*TIME_UNIT;
uint16_t INTER_LETTER_DELAY=3*TIME_UNIT;
uint16_t WORD_PAUSE=7*TIME_UNIT;
uint16_t INTER_MARK_DELAY=1*TIME_UNIT;
#define DOT 0
#define DASH 1
#define END 2

void setup() {
  // put your setup code here, to run once:
pinMode(BUTTON_PIN, INPUT);
pinMode(LED_PIN, OUTPUT);
}

void loop() {
digitalWrite(LED_PIN, LOW);
/
Your Code to detect a button is pushed
/
{
            blink('s'); 
            milliSecondDelay(INTER_LETTER_DELAY);
            blink('o');
            milliSecondDelay(INTER_LETTER_DELAY);
            blink('s');
            milliSecondDelay(WORD_PAUSE);
            blink('h'); 
            milliSecondDelay(INTER_LETTER_DELAY);
            blink('e');
            milliSecondDelay(INTER_LETTER_DELAY);
            blink('l');  
            milliSecondDelay(INTER_LETTER_DELAY);
            blink('p');       
            break;
}

}

uint8_t convert(char letter){
/Your code to convert a letter into a number so it knows which row in morseCode[][] to enter
/
}

void blink(char letter){
    uint8_t morseCode[26][5] = {
          {DOT, DASH, END},               // a
          {DASH, DOT, DOT, DOT, END},     // b
          {DASH, DOT, DASH, DOT, END},    // c
          {DASH, DOT, DOT, END},               // d
          {DOT, END},     // e
          {DOT, DOT, DASH, DOT, END},    // f 
          {DASH, DASH, DOT, END},               // g
          {DOT, DOT, DOT, DOT, END},     // h
          {DOT, DOT, END},    // i
          {DOT, DASH, DASH, DASH, END},               // j
          {DASH, DOT, DASH, END},     // k
          {DOT, DASH, DOT, DOT, END},    // l
          {DASH, DASH, END},               // m
          {DASH, DOT, END},     // n
          {DASH, DASH, DASH, END},    // o
          {DOT, DASH, DASH, DOT, END},               // p
          {DASH, DASH, DOT, DASH, END},     // q
          {DOT, DASH, DOT, END},    // r 
          {DOT, DOT, DOT, END},               // s
          {DASH, END},     // t
          {DOT, DOT, DASH, END},    // u
          {DOT, DOT, DOT, DASH, END},               // v
          {DOT, DASH, DASH, END},     // w
          {DASH, DOT, DOT, DASH, END},    // x
          {DASH, DOT, DASH, DASH, END},     // y
          {DASH, DASH, DOT, DOT, END}    // z 
    };
    
    uint8_t i = convert(letter);
    for (uint8_t j=0; j<5; j++){
        if(morseCode[i][j] != END){
            if (morseCode[i][j]==DOT){
/Your Code
Turn it on for a DOT duration
then Turn it off for the after-mark
intermark delay
/
            }
            else if (morseCode[i][j]==DASH){
/Your Code
Turn it on for a DOT duration
then Turn it off for the after-mark
intermark delay
/             
            }
        }
        else j=5;
    }
}

void milliSecondDelay(uint16_t ms) {

    uint16_t i;

    for (i = 0; i < ms; i++) {
      microSecondDelay(1000);
    }
}
    
void microSecondDelay(uint16_t us) {

    uint16_t i;

    for (i = 0; i < us; i++) {
      asm volatile("nop");
      asm volatile("nop");
      asm volatile("nop");
      asm volatile("nop");
      asm volatile("nop");
      asm volatile("nop");
      asm volatile("nop");
      asm volatile("nop");
      asm volatile("nop");
    } 
}