int relayPin = 13; // Assign relayPin to pin 13. This is the power source for the relay

int timeUnit = 100; // This variable will be used to measure dots, dashes, breaks, and pauses
char input; // Variable to save the input to

void setup () {
Serial.begin(9600);//for the connect with the board
pinMode(relayPin,OUTPUT);
}

void loop () {
if (Serial.available()) {
input = Serial.read();//read the input
if (input == 'a' || input == 'A') {lA();} //if the input is a or A go to function lA
if (input == 'b' || input == 'B') {lB();} //same but with b letter
if (input == 'c' || input == 'C') {lC();}
if (input == 'd' || input == 'D') {lD();}
if (input == 'e' || input == 'E') {lE();}
if (input == 'f' || input == 'F') {lF();}
if (input == 'g' || input == 'G') {lG();}
if (input == 'h' || input == 'H') {lH();}
if (input == 'i' || input == 'I') {lI();}
if (input == 'j' || input == 'J') {lJ();}
if (input == 'k' || input == 'K') {lK();}
if (input == 'l' || input == 'L') {lL();}
if (input == 'm' || input == 'M') {lM();}
if (input == 'n' || input == 'N') {lN();}
if (input == 'o' || input == 'O') {lO();}
if (input == 'p' || input == 'P') {lP();}
if (input == 'q' || input == 'Q') {lQ();}
if (input == 'r' || input == 'R') {lR();}
if (input == 's' || input == 'S') {lS();}
if (input == 't' || input == 'T') {lT();}
if (input == 'u' || input == 'U') {lU();}
if (input == 'v' || input == 'V') {lV();}
if (input == 'w' || input == 'W') {lW();}
if (input == 'x' || input == 'X') {lX();}
if (input == 'y' || input == 'Y') {lY();}
if (input == 'z' || input == 'Z') {lZ();}
if (input == ' ') {wordPause();}
Serial.println (input);

}
}
//Letter functions
void lA () {dot();dash();letterPause();} //letter A in morse code!
void lB () {dash();dot();dot();dot();letterPause();} //same for B
void lC () {dash();dot();dash();dot();letterPause();}
void lD () {dash();dot();dot();letterPause();}
void lE () {dot();letterPause();}
void lF () {dot();dot();dash();dot();letterPause();}
void lG () {dash();dash();dot();letterPause();}
void lH () {dot();dot();dot();dot();letterPause();}
void lI () {dot();dot();letterPause();}
void lJ () {dot();dash();dash();dash();letterPause();}
void lK () {dash();dot();dash();letterPause();}
void lL () {dot();dash();dot();dot();letterPause();}
void lM () {dash();dash();letterPause();}
void lN () {dash();dot();letterPause();}
void lO () {dash();dash();dash();letterPause();}
void lP () {dot();dash();dash();dot();letterPause();}
void lQ () {dash();dash();dot();dash();letterPause();}
void lR () {dot();dash();dot();letterPause();}
void lS () {dot();dot();dot();letterPause();}
void lT () {dash();letterPause();}
void lU () {dot();dot();dash();letterPause();}
void lV () {dot();dot();dot();dash();letterPause();}
void lW () {dot();dash();dash();letterPause();}
void lX () {dash();dot();dot();dash();letterPause();}
void lY () {dash();dot();dash();dash();letterPause();}
void lZ () {dash();dash();dot();dot();letterPause();}

void dot() //Create a tap and delay for 100 milliseconds
{
digitalWrite(relayPin,HIGH); //turns the relay on, creating a tap on the telegraph
delay(timeUnit); //delays the dot so it is distinguishible from a dash
digitalWrite(relayPin,LOW); //turns the relay off
delay(timeUnit * 2); 
}

void dash() //Create a tap and delay for 300 milliseconds
{
digitalWrite(relayPin,HIGH); //turns the relay on, creating a tap on the telegraph
delay(timeUnit * 3); //delays the dash 3 times the delay of the dot 
digitalWrite(relayPin,LOW); //turns the relay off
delay(timeUnit * 4); 
}

void letterPause() //Delay between letters for 300 milliseconds
{
delay(timeUnit * 3);
}

void wordPause() //Delay between words for 700 milliseconds
{
delay (timeUnit * 7);
}