Project showcase
Arduino Morse Code Machine

Arduino Morse Code Machine © GPL3+

A simple Arduino Morse code machine with a button, LED, and a buzzer that translates your input into English while you are typing.

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  • 31 respects

Components and supplies

Apps and online services

About this project

Although I am pretty new to the IoT and Arduino stage, with the help of my friends and classmates and my professor I got into it pretty quickly. This was one of my first real projects, finished a while ago, but I am still making improvements.

Morse Code

Considering I knew Morse code as a kid, and that I wanted to play with the components, I decided on the Morse machine.

The isn't to hard to make, it requires some basic parts (listed below) and some basic programming skill (feel free to play with the code and make it more interesting/efficient). Although writing in Morse code is pretty hard you get a hang of it after a while. I practiced with printed out sheet which you can get online. Don't feel bad if you make mistakes or the timer feels odd, for practice I advise to change those variable values to make it easier to practice and when you become a pro, turn down those values, so you sound like a pro.

In Action

Here is my attempt after not playing with this setup for a while.

Second attempt.

If you need help with code or the setup feel free to contact me.

Code

morsecode_manual.inoArduino
Arduino code for running the morse code machine.
It's a relatively simple code with a state machine depending on the state of the button (just pressed, just released, nosignal and signal). Procedure printaj is ugly block of code but it works.
If you have any questions or suggestions feel free to ask, and if you want to contribute here is a github repo https://github.com/Krsma/Morse-code-manual.
//Made by Vladimir Krsmanovic
const int buttonPin = 2;    
const int ledPin = 13;      
const int buzzer = 9;

int ledState = HIGH;         
int buttonState = LOW;             
int lastButtonState = LOW;  
int doesitwork = LOW;  // variable used for debuging early versions of the code

int pause_value = 250;  // depending on your skill and how fast your fingers are you can change this value to make typing a message faster or slower
long signal_length = 0;
long pause = 0;

String morse = "";
String dash = "-";
String dot = "*";

boolean cheker = false;
boolean linecheker = false;

long lastDebounceTime = 0;  
long debounceDelay = 50;    
void setup()
{
  Serial.begin(9600);
  
  pinMode(buttonPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(buzzer, OUTPUT);
  
  Serial.println("Welcome to Arduino-Uno morse machine");
  Serial.println("Using these values print out your message in morse and read out the message in english in the serial monitor");
  Serial.println("https://goo.gl/images/R4AIsW morse code values for learing");

  while(!digitalRead(buttonPin))
    ;
  
}

void loop() {
 
  buttonState = digitalRead(buttonPin);

  
  
  if (buttonState && lastButtonState)       // basic state machine depending on the state of the signal from the button
  {
    ++signal_length;       
    if (signal_length<2*pause_value)        //this help to notice that there is a change in the signal length aka that its not a dot anymore but a dash
    {                                       // best use for the measuring of signal_length would be use of the millis() but this was used  for simplicity 
    tone(buzzer, 1500) ;
    }
    else
    {
      tone(buzzer, 1000) ;
      }
  }
  else if(!buttonState && lastButtonState)          //this part of the code happens when the button is released and it send either * or - into the buffer
  {
     
     if (signal_length>50 && signal_length<2*pause_value )
     {
       morse =  morse + dot;
     } 
      else if (signal_length>2*pause_value)
      {
        morse = morse +  dash;
      }
    signal_length=0; 
    digitalWrite(13, LOW); 
    noTone(buzzer); 
  }
  else if(buttonState && !lastButtonState)          // this part happens when the button is pressed and its use to reset several values
  {
    pause=0;
    digitalWrite(13, HIGH);  
    cheker = true;
    linecheker = true;
  }
  else if (!buttonState && !lastButtonState)
  {  
    ++pause;
    if (( pause>3*pause_value ) && (cheker))
    { 
      printaj(morse);
      cheker = false;
      morse = "";
    }
    if ((pause>15*pause_value) && (linecheker))
    {
      Serial.println();
      linecheker = false;
    }
  }
  lastButtonState=buttonState;
  delay(1);
}
void printaj(String prevodilac)   //ugly part of the code but it works fine
{                                 //compare morse string to known morse values and print out the letter or a number 
                                  //the code is written based on the international morse code, one thing i changed is that insted of typing a special string to end the line it happens with enough delay  
  if (prevodilac=="*-")
    Serial.print("A");
  else if (prevodilac=="-***")  
    Serial.print("B");
  else if (prevodilac=="-*-*")  
    Serial.print("C");
  else if (prevodilac=="-**")  
    Serial.print("D");
  else if (prevodilac=="*")  
    Serial.print("E");
  else if (prevodilac=="**-*")  
    Serial.print("F");
  else if (prevodilac=="--*")  
    Serial.print("G");
  else if (prevodilac=="****")  
    Serial.print("H");
  else if (prevodilac=="**")  
    Serial.print("I");
  else if (prevodilac=="*---")  
    Serial.print("J");
  else if (prevodilac=="-*-")  
    Serial.print("K");
  else if (prevodilac=="*-**")  
    Serial.print("L");
  else if (prevodilac=="--")  
    Serial.print("M");
  else if (prevodilac=="-*")  
    Serial.print("N");
  else if (prevodilac=="---")  
    Serial.print("O");
  else if (prevodilac=="*--*")  
    Serial.print("P");
  else if (prevodilac=="--*-")  
    Serial.print("Q");
  else if (prevodilac=="*-*")  
    Serial.print("R");
  else if (prevodilac=="***")  
    Serial.print("S");
  else if (prevodilac=="-")  
    Serial.print("T");
  else if (prevodilac=="**-")  
    Serial.print("U");
  else if (prevodilac=="***-")  
    Serial.print("V");
  else if (prevodilac=="*--")  
    Serial.print("W");
  else if (prevodilac=="-**-")  
    Serial.print("X");
  else if (prevodilac=="-*--")  
    Serial.print("Y");
  else if (prevodilac=="--**")  
    Serial.print("Z");

  else if (prevodilac=="*----")  
    Serial.print("1");
  else if (prevodilac=="**---")  
    Serial.print("2");
  else if (prevodilac=="***--")  
    Serial.print("3");
  else if (prevodilac=="****-")  
    Serial.print("4");
  else if (prevodilac=="*****")  
    Serial.print("5");
  else if (prevodilac=="-****")
    Serial.print("6");
  else if (prevodilac=="--***")  
    Serial.print("7");
  else if (prevodilac=="---**")  
    Serial.print("8");
  else if (prevodilac=="----*")  
    Serial.print("9");
  else if (prevodilac=="-----")  
    Serial.print("0");
  
  Serial.print(" ");
    
  prevodilac=""; 
}

Schematics

untitled-sketch(1)_JRigxP5ene.fzz
Its a pretty simple schematic, no breadboard required. Just be careful connecting the parts so you don't wreck your arduino.
morse-code-machine_QSdSF1fCQ1.fzz

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