int delay_long = 800;
int delay_short = 300;

void setup() {
  // put your setup code here, to run once:
  pinMode(2, INPUT);
  pinMode(4, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  send_a();Serial.print('A');
  delay(400);
  send_b();Serial.print('B');
  delay(400);
  send_c();Serial.print('C');
  delay(400);
  send_d();Serial.print('D');
  delay(400);
  send_e();Serial.print('E');
  delay(400);
  send_f();Serial.print('F');
  delay(400);
  send_g();Serial.print('G');
  delay(400);
  send_h();Serial.print('H');
  delay(400);
  send_i();Serial.print('I');
  delay(400);
  send_j();Serial.print('J');
  delay(400);
  send_k();Serial.print('K');
  delay(400);
  send_l();Serial.print('L');
  delay(400);
  send_m();Serial.print('M');
  delay(400);
  send_n();Serial.print('N');
  delay(400);
  send_o();Serial.print('O');
  delay(400);
  send_p();Serial.print('P');
  delay(400);
  send_q();Serial.print('Q');
  delay(400);
  send_r();Serial.print('R');
  delay(400);
  send_s();Serial.print('S');
  delay(400);
  send_t();Serial.print('T');
  delay(400);
  send_u();Serial.print('U');
  delay(400);
  send_v();Serial.print('V');
  delay(400);
  send_w();Serial.print('W');
  delay(400);
  send_x();Serial.print('X');
  delay(400);
  send_y();Serial.print('Y');
  delay(400);
  send_z();Serial.print('Z');
  delay(400);
}

void flash_line(){
  digitalWrite(2, HIGH);
  delay(delay_long);
  digitalWrite(2, LOW);
  delay(150);
}

void flash_dot(){
  digitalWrite(2, HIGH);
  delay(delay_short);
  digitalWrite(2, LOW);
  delay(150);
}

void send_a(){
  flash_dot();
  delay(100);
  flash_line();
  delay(100);
}

void send_b(){
  flash_line();
  delay(100);
  for(int i = 0; i < 3; i++){
    flash_dot();
    delay(100);
  }
}

void send_c(){
  for(int i = 0; i < 2; i++){
    flash_line();
    delay(100);
    flash_dot();
    delay(100);
  }
}

void send_d(){
  flash_line();
  delay(100);
  flash_dot();
  delay(100);
  flash_dot();
  delay(100);
}

void send_e(){
  flash_dot();
  delay(100);
}

void send_f(){
  flash_dot();
  delay(100);
  flash_dot();
  delay(100);
  flash_line();
  delay(100);
  flash_dot();
  delay(100);
}

void send_g(){
  for(int i = 0; i < 2; i++){
    flash_line();
    delay(100);
  }
  flash_dot();
  delay(100);
}

void send_h(){
  for(int i = 0; i < 4; i++){
    flash_dot();
    delay(100);
  }
}

void send_i(){
  for(int i = 0; i < 2; i++){
    flash_dot();
    delay(100);
  }
}

void send_j(){
  flash_dot();
  delay(100);
  for(int i = 0; i < 3; i++){
    flash_line();
    delay(100);
  }
}

void send_k(){
  flash_line();
  delay(100);
  flash_dot();
  delay(100);
  flash_line();
  delay(100);
}

void send_l(){
  flash_dot();
  delay(100);
  flash_line();
  delay(100);
  flash_dot();
  delay(100);
  flash_dot();
  delay(100);
}

void send_m(){
  for(int i = 0; i < 2; i++){
    flash_line();
    delay(100);
  }
}

void send_n(){
  flash_line();
  delay(100);
  flash_dot();
  delay(100);
}

void send_o(){
  for(int i = 0; i < 3; i++){
    flash_line();
    delay(100);
  }
}

void send_p(){
  flash_dot();
  delay(100);
  for(int i = 0; i < 2; i++){
    flash_line();
    delay(100);
  }
  flash_dot();
  delay(100);
}

void send_q(){
  for(int i = 0; i < 2; i++){
    flash_line();
    delay(100);
  }
  flash_dot();
  delay(100);
  flash_line();
  delay(100);
}

void send_r(){
  flash_dot();
  delay(100);
  flash_line();
  delay(100);
  flash_dot();
  delay(100);
}

void send_s(){
  for(int i = 0; i < 3; i++){
    flash_dot();
    delay(100);
  }
}

void send_t(){
  flash_line();
  delay(100);
}

void send_u(){
  flash_dot();
  delay(100);
  flash_dot();
  delay(100);
  flash_line();
  delay(100);
}

void send_v(){
  for(int i = 0; i < 3; i++){
    flash_dot();
    delay(100);
  }
  flash_line();
  delay(100);
}

void send_w(){
  flash_dot();
  delay(100);
  for(int i = 0; i < 2; i++){
    flash_line();
    delay(100);
  }
}

void send_x(){
  flash_line();
  delay(100);
  for(int i = 0; i < 2; i++){
    flash_dot();
    delay(100);
  }
  flash_line();
  delay(100);
}

void send_y(){
  flash_line();
  delay(100);
  flash_dot();
  delay(100);
  for(int i = 0; i < 2; i++){
    flash_line();
    delay(100);
  }
}

void send_z(){
  for(int i = 0; i < 2; i++){
    flash_line();
    delay(100);
  }
  for(int i = 0; i < 2; i++){
    flash_dot();
    delay(100);
  }
}