Morse Code Reader with Arduino

This project is a simple Morse code reader made with Arduino using only two push buttons:

• One for inputting the code (. or -)
• Another to clear/reset the current sequence

The duration of each press determines if it is a dot (.) or a dash (-), and the pause between presses determines spaces ( ) and slashes (/) for new words.

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📸 Demo Preview

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🧠 Features

• Press duration logic to detect dot or dash
• Time between presses defines letters or words
• Real-time display of the full Morse sequence in the Serial Monitor
• Reset button clears everything

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🧰 Components Used

• Arduino UNO
• 2x Push buttons
• Breadboard & jumper wires

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📷 Breadboard View

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🗺️ Schematic View

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💻 Code

int btnMorsePin = 9;
int btnClearPin = 10;
unsigned long timer_pushing = 0;
unsigned long result_pushing = 0;
unsigned long timer_between = 0;
unsigned long result_between = 0;
bool first_click = true;
bool clicked = false;
bool last_state_morse = HIGH;
String text = "";

void setup()
{
  Serial.begin(9600);
  pinMode(btnMorsePin, INPUT_PULLUP);
  pinMode(btnClearPin, INPUT_PULLUP);
}

void loop() {
  bool current_state_morse = digitalRead(btnMorsePin);
  bool current_state_clear = digitalRead(btnClearPin);

  if (current_state_morse == LOW && last_state_morse == HIGH && !clicked) {
    if (timer_between == 0) {
      timer_between = millis();
    } else {
      result_between = millis() - timer_between;
    }
    timer_pushing = millis();
    clicked = true;
  }
  else if (current_state_morse == HIGH && clicked) {
    result_pushing = millis() - timer_pushing;
    if (result_between > 3200) {
      text += " / ";
    } else if (result_between > 1500) {
      text += " ";
    }
    if (result_pushing >= 250) {
      text += "-";
    } else if (result_pushing < 250) {
      text += ".";
    } else {
      Serial.println("Error!");
    }
    Serial.println(text);
    timer_between = millis();
    clicked = false;
  }

  if (current_state_clear == LOW) {
    Serial.println("\nCleaned!\n");
    timer_pushing = 0;
    result_pushing = 0;
    timer_between = 0;
    result_between = 0;
    first_click = true;
    clicked = false;
    last_state_morse = HIGH;
    text = "";
    delay(300);
  }

  last_state_morse = current_state_morse;
}

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📜 License

MIT License – feel free to use, modify, and share. Credit is appreciated!

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Fully written by Mateus Vega (15y 🇧🇷)