#include <Arduino.h>
#include <Wire.h>
#include <SoftwareSerial.h>

int ledPin = 13;

//For letters
char* letters[] = {
".-", "-...", "-.-.", "-..", ".", "..-.", "--.", "....", "..", // A-I
".---", "-.-", ".-..", "--", "-.", "---", ".--.", "--.-", ".-.", // J-R
"...", "-", "..-", "...-", ".--", "-..-", "-.--", "--.." // S-Z
};

//For Numbers
char* numbers[] = {
  "-----", ".----", "..---", "...--", "....-", ".....",
"-....", "--...", "---..", "----."
};
int dotDelay = 200;

void setup() {
  // put your setup code here, to run once:

  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);

}

void loop() {
  // put your main code here, to run repeatedly:
  char ch;
if (Serial.available()){
  ch = Serial.read(); // read a single letter if (ch >= 'a' && ch <= 'z')
  if (ch >= 'a' && ch <= 'z')
  {
  flashSequence(letters[ch - 'a']);
  }
  else if (ch >= 'A' && ch <= 'Z') {
  flashSequence(letters[ch - 'A']); }
  else if (ch >= '0' && ch <= '9') {
  flashSequence(numbers[ch - '0']); }
  else if (ch == ' ') {
  delay(dotDelay * 4);
  }
}

}

void flashSequence(char* sequence) {
  int i = 0;
  while (sequence[i] != NULL) {
    flashDotOrDash(sequence[i]);
    i++;
  }
  delay(dotDelay * 3);
}


void flashDotOrDash(char dotOrDash) {
  digitalWrite(ledPin, HIGH);
  if (dotOrDash == '.'){
    delay(dotDelay);
  }
  else { // must be a -
  delay(dotDelay * 3); }
  digitalWrite(ledPin, LOW); delay(dotDelay);
}