int led = 2;
int buz = 3;
int dotTime = 100;
int dashTime = 250;
int spaceTime = 150;

void setup() {
  // put your setup code here, to run once:
  pinMode(led, OUTPUT);
  pinMode(buz, OUTPUT);
  Serial.begin(9600);
  digitalWrite(buz, LOW);
  digitalWrite(led, LOW);
  Serial.println("Write something");
  delay((500));
}

void loop() {
  // put your main code here, to run repeatedly:
  if (Serial.available() > 0) {
    char receivedChar = Serial.read();
    space();
    morse(receivedChar);
    Serial.println(receivedChar);
  }
}

void dot() {
  int startTime = millis();
  digitalWrite(led, HIGH);
  do {
    digitalWrite(buz, HIGH);
    delay(1);
    digitalWrite(buz, LOW);
    delay(1);
  }
  while (millis() - startTime < dotTime);
  digitalWrite(led, LOW);
  delay(spaceTime);
}

void dash() {
  int startTime = millis();
  digitalWrite(led, HIGH);
  do {
    digitalWrite(buz, HIGH);
    delay(1);
    digitalWrite(buz, LOW);
    delay(1);
  }
  while (millis() - startTime < dashTime);
  digitalWrite(led, LOW);
  delay(spaceTime);
}

void space()
{
  delay(spaceTime);
  delay(spaceTime);
}

void longSpace()
{
  delay(6 * spaceTime);
}

void morse(char x)
{
  if (x == 'a'||x=='A')
  {
    dot(); dash();
  }
  else if (x == 'b'||x=='B')
  {
    dash(); dot(); dot(); dot();
  }
  else if (x == 'c'||x=='C')
  {
    dash(); dot(); dash(); dot();
  }
    else if (x == 'd'||x=='C')
  {
    dash(); dot();  dot();
  }
    else if (x == 'e'||x=='E')
  {
     dot();
  }
    else if (x == 'f'||x=='F')
  {
    dot(); dot(); dash(); dot();
  }
    else if (x == 'g'||x=='G')
  {
    dash(); dash(); dot();
  }
    else if (x == 'h'||x=='H')
  {
    dot(); dot(); dot(); dot();
  }
    else if (x == 'i'||x=='I')
  {
   dot(); dot();
  }
    else if (x == 'j'||x=='J')
  {
     dot(); dash(); dash(); dash();
  }
    else if (x == 'k'||x=='K')
  {
    dash(); dot(); dash();
  }
    else if (x == 'l'||x=='L')
  {
     dot(); dash(); dot(); dot();
  }
    else if (x == 'm'||x=='M')
  {
    dash(); dash(); 
  }
    else if (x == 'n'||x=='N')
  {
     dash(); dot();
  }
    else if (x == 'o'||x=='O')
  {
    dash();  dash(); dash();
  }
    else if (x == 'p'||x=='P')
  {
     dot(); dash(); dash(); dot();
  }
    else if (x == 'q'||x=='Q')
  {
    dash();  dash(); dot(); dash();
  }
    else if (x == 'r'||x=='R')
  {
    dot(); dash(); dot();
  }
    else if (x == 's'||x=='S')
  {
    dot();  dot(); dot();
  }
    else if (x == 't'||x=='T')
  {
    dash();
  }
    else if (x == 'u'||x=='U')
  {
     dot();  dot(); dash();
  }
    else if (x == 'v'||x=='V')
  {
    dash(); dash(); dash(); dot();
  }
    else if (x == 'w'||x=='W')
  {
     dot(); dash(); dash();
  }
    else if (x == 'x'||x=='X')
  {
    dash(); dot(); dot(); dash();
  }
    else if (x == 'y'||x=='Y')
  {
    dash(); dot(); dash(); dash();
  }
    else if (x == 'z'||x=='Z')
  {
    dash(); dash(); dot(); dot();
  }
    else if (x == ' ')
  {
    longSpace();
  }
}