// Bilkent IEEE RAS 2014 Fall Arduino Trainings
// Lab1-Morse Code Solutions
// For questions or comments please contact Ahmet Safa Ozturk - ahmetsafaozturk@gmail.com
// This solution will be analysed at the beginning of the 2nd session.

int alphamorse [36][9] =
{
  { 1, 1, 3, 0, 0, 0, 0, 0, 0},//a
  { 3, 1, 1, 1, 1, 1, 1, 0, 0},//b
  { 3, 1, 1, 1, 3, 1, 1, 0, 0},//c
  { 3, 1, 1, 1, 1, 0, 0, 0, 0},//d
  { 1, 0, 0, 0, 0, 0, 0, 0, 0},//e
  { 1, 1, 1, 1, 3, 1, 1, 0, 0},//f
  { 3, 1, 3, 1, 1, 0, 0, 0, 0},//g
  { 1, 1, 1, 1, 1, 1, 1, 0, 0},//h
  { 1, 1, 1, 0, 0, 0, 0, 0, 0},//i
  
  { 1, 1, 3, 1, 3, 1, 3, 0, 0},//j
  { 3, 1, 1, 1, 3, 0, 0, 0, 0},//k
  { 1, 1, 3, 1, 1, 1, 1, 0, 0},//l
  { 3, 1, 3, 0, 0, 0, 0, 0, 0},//m
  { 3, 1, 1, 0, 0, 0, 0, 0, 0},//n
  { 3, 1, 3, 1, 3, 0, 0, 0, 0},//o
  { 1, 1, 3, 1, 3, 1, 1, 0, 0},//p
  { 3, 1, 3, 1, 1, 1, 3, 0, 0},//q
  { 1, 1, 3, 1, 1, 0, 0, 0, 0},//r
  
  { 1, 1, 1, 1, 1, 0, 0, 0, 0},//s
  { 3, 0, 0, 0, 0, 0, 0, 0, 0},//t
  { 1, 1, 1, 1, 3, 0, 0, 0, 0},//u
  { 1, 1, 1, 1, 1, 1, 3, 0, 0},//v
  { 1, 1, 3, 1, 3, 0, 0, 0, 0},//w
  { 3, 1, 1, 1, 1, 1, 3, 0, 0},//x
  { 3, 1, 1, 1, 3, 1, 3, 0, 0},//y
  { 3, 1, 3, 1, 1, 1, 1, 0, 0},//z
  
  { 1, 1, 3, 1, 3, 1, 3, 1, 3},//1
  { 1, 1, 1, 1, 3, 1, 3, 1, 3},//2
  { 1, 1, 1, 1, 1, 1, 3, 1, 3},//3
  { 1, 1, 1, 1, 1, 1, 1, 1, 3},//4
  { 1, 1, 1, 1, 1, 1, 1, 1, 1},//5
  { 3, 1, 1, 1, 1, 1, 1, 1, 1},//6
  { 3, 1, 3, 1, 1, 1, 1, 1, 1},//7
  { 3, 1, 3, 1, 3, 1, 1, 1, 1},//8
  { 3, 1, 3, 1, 3, 1, 3, 1, 1},//9
  { 3, 1, 3, 1, 3, 1, 3, 1, 3},//0
};

char alphabet [36] = "abcdefghijklmnoprstuvwxyz1234567890";

int ledPin = 13; // assigning pin 13 to the led

int t = 1000; // time of one dot

void setup()
{
  pinMode( ledPin, OUTPUT); // setting ledPin as output
  Serial.begin(9600); // starting the serial - assume 9600 as a constant
}

void loop()
{
  char ch; // declining a new char
  ch = Serial.read(); // reading char from the user
  morse( ch); // using my morse function
  delay( 3000); // time between two letters
}

void morse( char ch) // morse function which converts the char to the led morse code
{
  
  int index = 0; // index of the letter or the number 
  
  // finding where is the entered character
  for( int i = 0; i < 36; i++) 
  {
    if( alphabet[i] == ch)
    {
      index = i;
      break;
    }
  }
  
  // converting this character to the morse code
  for( int i = 0; i < 10; i+=2)
  {
    digitalWrite(ledPin, HIGH);
    delay( t*alphamorse[index][i]);
    if( i != 8)
    {
      digitalWrite(ledPin, LOW);
      delay( t*alphamorse[index][i+1]);
    }
  }
  digitalWrite(ledPin, LOW);
  
  // after every character theres is a 2 dot time delay in morse code
  delay( t*2);
}