Morse Code - Serial Monitor Input to Morse Code

The project will wait for an input, and then turn it into Morse Code! (Alphabet only)   Component List:

• 1 x Arduino Uno R3
• 1 x Buzzer

Wiring Guide:

1. Connect the positive (longer) leg of the buzzer to digital pin 6 on the Arduino.
2. Connect the negative (shorter) leg of the buzzer to the GND pin on the Arduino (or breadboard).

    CODE:

String keyWord=""; //Variable to store the current keyword entered
int buzzer=6; //setting the buzzer pin
int longBlink=400; //all these values can be easily customized
int shortBlink=50;
int letterDelay=350; //if the delay is too fast the buzz is not heard clearly

char letters[]= {'a',   'b',    'c',    'd',    'e',    'f',    'g',    'h',    'i',    'j',    'k',    'l',    'm',    'n',    'o',    'p',    'q',    'r',    's',    't',    'u',    'v',    'w',    'x',    'y',    'z'}; //This is so we can get the index number of the letter

//This is the Alphabet morse code, it can easily be extended further
char morseCode[26][4] = { 
  {'1','2','0','0'}, //A
  {'2','1','1','1'}, //B
  {'2','1','2','1'}, //C
  {'2','1','1','0'}, //D
  {'1','0','0','0'}, //E
  {'1','1','2','1'}, //F
  {'2','2','1','0'}, //G
  {'1','1','1','1'}, //H
  {'1','1','0','0'}, //I
  {'1','2','2','2'}, //J
  {'2','1','2','0'}, //K
  {'1','2','1','1'}, //L
  {'2','2','0','0'}, //M
  {'2','1','0','0'}, //N
  {'2','2','2','0'}, //O
  {'1','2','2','1'}, //P
  {'2','2','1','2'}, //Q
  {'1','2','1','0'}, //R
  {'1','1','1','0'}, //S
  {'2','0','0','0'}, //T
  {'1','1','2','0'}, //U
  {'1','1','1','2'}, //V
  {'1','2','2','0'}, //W
  {'2','1','1','2'}, //X
  {'2','1','2','2'}, //Y
  {'2','2','1','1'}, //Z
};


void setup()
{
  Serial.begin(9600);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(buzzer,OUTPUT); //buzzer pin set to output
}

void loop()
{

  while (Serial.available() == 0) //Wait for a user input
  {
  }
  keyWord=Serial.readString(); //Parse the value as a string
  MorseCodeMatch(keyWord); //send to our function
}

void MorseCodeMatch(String keyWord)
{ 
  keyWord.toLowerCase(); //to avoid any issues with case sensitivity
  int wordLen=keyWord.length()+1;
  char keyChar[wordLen]; //create a character type value array, of the length of the word we are processing

  keyWord.toCharArray(keyChar,wordLen); //Break the string into characters

  for (int i=0; i<wordLen;i++) //go through each letter of the kerWord
    for (int j=0; j<sizeof(letters);j++) //go through the alphabet to find that letter.
       if(keyChar[i]==letters[j]) //trying to match it
          blinkCodeLED(morseCode[j]); //send the letter to be blinked

Serial.println("morseCode Function Done");
}

void blinkCodeLED(char morseMessage[])
{

for (int i=0;i<4;i++) //Length of the Morse code per letter is 4, so loop 4 times
  {
    if(morseMessage[i]=='1') //if Dot
      {
        digitalWrite(LED_BUILTIN, HIGH);
        tone(buzzer, 5000, shortBlink);
        Serial.print("."); //Dot
      }
    else if(morseMessage[i]=='2') //if Dash
    {
      digitalWrite(LED_BUILTIN, HIGH);
      tone(buzzer, 5000, longBlink);
      Serial.print("-"); //Dash
    }
    digitalWrite(LED_BUILTIN, LOW); //Reset LED and put a delay between letters
    delay(letterDelay);}
    Serial.print(" "); //Space
    delay(500);
} 

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