Chapter 27 – Experiment 19 – HELLO! HELLO! HELLO!

From Wikipedia (

“Morse code is a method of transmitting text information as a series of on-off tones, lights, or clicks that can be directly understood by a skilled listener or observer without special equipment. The International Morse Code encodes the ISO basic Latin alphabet, some extra Latin letters, the Arabic numerals and a small set of punctuation and procedural signals as standardized sequences of short and long signals called dots and dashes”

This experiment introduce to you to Morse code, that is used from long time in the communication field. The code will be in updated with some interactivity and in future experiments, in the advanced kit, you will be able to exchange data with other microcontrollers/kits using different communication channels.

The circuit is the same as Experiment 01.

WE MAKE IT – Morse code, Experiment 19

Original version from:
Morse Code Flasher
Written for / Custom PC

int ledPin = 12; /* Pin 12 is the external circuit used in the experiment 01, Pin 13 is the pin on the board */

void setup() /* Where the defaults are set */
pinMode(ledPin, OUTPUT);

void loop() /* Where the meat of the program goes */

void HELLO() {

dot(); dot(); dot(); dot(); letterpause();   // H
dot(); letterpause();   // E
dot(); dot(); dot(); dot(); letterpause();   // L
dot(); dot(); dot(); dot(); letterpause();   // L
dot(); dash(); dot(); dot(); letterpause();   // O


void dot() /* Define a ‘dot */
digitalWrite(ledPin, HIGH);
digitalWrite(ledPin, LOW);

void dash() /* Define a ‘dash’ */
digitalWrite(ledPin, HIGH);
digitalWrite(ledPin, LOW);

void letterpause() /* Insert a pause between letters */

void wordpause() /* Insert a pause between words */


  1. [...] Experiment 17 – DATALOG TEMPERATURE Chapter 26 – Experiment 18 – SMOOTHING WHEN READING DATA Chapter 27 – Experiment 19 – HELLO! HELLO! HELLO! Chapter 28 – Experiment 20 – POTENTIOMETER Chapter 29 – Experiment 21 – SURPRISE 1 Chapter [...]

  2. The morse code is not quite right. For hello in international morse code it should be

    dot(); dot(); dot(); dot(); letterpause(); // H
    dot(); letterpause(); // E
    dot(); dash(); dot(); dot(); letterpause(); // L
    dot(); dash(); dot(); dot(); letterpause(); // L
    dash(); dash(); dash(); letterpause(); // O

    based on

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