Blink Experiments

After completing the Blink project, test yourself by trying these experiments.

1 Modify the code so that it will turn the LED on for 2 seconds, and then turn the LED off for 1/2 a second. Blink on for 2 and off for 1/2
Remember to press the Upload button to upload and run the program on the Arduino board after each time you make any modifications to your program.
2 Modify the code so that the LED blinks like your heart beat. Blink heart beat
3 Make a Morse code sender to send out the emergency Morse code dot-dot-dot dash-dash-dash dot-dot-dot for SOS.

Morse Code 		Note the use of comments and blank lines in the code below to make the code easier to understand.
  
// Code to flash the Morse Code for SOS
void setup() {
  pinMode(13, OUTPUT);
}

void loop() {
  // code to do three short flashes for S
  digitalWrite(13, HIGH);
  delay(200);
  digitalWrite(13, LOW);
  delay(200);
  digitalWrite(13, HIGH);
  delay(200);
  digitalWrite(13, LOW);
  delay(200);
  digitalWrite(13, HIGH);
  delay(200);
  digitalWrite(13, LOW);
  delay(600); // a longer delay to separate the S from the O

  // code to do three long flashes for O
  digitalWrite(13, HIGH);
  delay(600);
  digitalWrite(13, LOW);
  delay(600);
  digitalWrite(13, HIGH);
  delay(600);
  digitalWrite(13, LOW);
  delay(600);
  digitalWrite(13, HIGH);
  delay(600);
  digitalWrite(13, LOW);
  delay(600);

  // code to do three short flashes for S
  digitalWrite(13, HIGH);
  delay(200);
  digitalWrite(13, LOW);
  delay(200);
  digitalWrite(13, HIGH);
  delay(200);
  digitalWrite(13, LOW);
  delay(200);
  digitalWrite(13, HIGH);
  delay(200);
  digitalWrite(13, LOW);
  delay(1000);  // a longer delay before repeating
}

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