Morse Code S.O.S. Flasher

In this project, we will make our LED flash the sequence S.O.S. over and over again.

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Things used in this project

Hardware components

Arduino UNO

Resistor 221 ohm

LED (generic)

Jumper wires (generic)

Breadboard (generic)

Software apps and online services

Arduino IDE

Story

Morse code used to be a vital method of communication in the 19th and 20th centuries. It's coding of letters as a series of long and short dots meant that it could be sent over telegraph wires, over a radio link, and using signaling lights.

The letters S.O.S. (Save Our Souls) is still recognized as an international signal of distress.

Code

S.O.S Morse Code

int ledPin=8;

 void setup() {
  // put your setup code here, to run once:
pinMode(ledPin,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  
    flash(200); flash(200); flash(200); // S
    delay(300); // otherwise the flashes run together
    flash(500); flash(500); flash(500); // O
    flash(200); flash(200); flash(200); // S
    delay(1000);
    
}

void flash(int duration)
{
  digitalWrite(ledPin,HIGH);
  delay(duration);
  digitalWrite(ledPin,LOW);
  delay(duration);
}