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.
- 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
- Arduino UNO
- 2x Push buttons
- Breadboard & jumper wires
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;
}
MIT License – feel free to use, modify, and share. Credit is appreciated!
Fully written by Mateus Vega (15y 🇧🇷)