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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | /*
Exercise 1_2 Blink SOS an alternative way
This program blinks SOS in Morse code with an LED:
* short-short-short = S
* long-long-long = O
* short-short-short = S
This example is part of the Fritzing Creator Kit: www.fritzing.org/creator-kit.
*/
int led = 13; // integer variable led is declared
char signals[] = {'.','.','.','-','-','-','.','.','.'}; // variable storing the signals: . = short, - = long
void setup() { // the setup() method is executed only once
pinMode(led, OUTPUT); // the led PIN is declared as digital output
}
void loop() { // the loop() method is repeated
for (int i=0; i<sizeof(signals); i++){ // repeat as often as the array has got entries (here 9 times)
digitalWrite(led,HIGH); // switching on the led
if (signals[i]=='.') delay(200); // if the array contains an "." at position i wait short
if (signals[i]=='-') delay(500); // if the array contains an "-" at position i wait long
digitalWrite(led,LOW); // switching off the led
if (signals[i]=='.') delay(200); // if the array contains an "." at position i wait short
if (signals[i]=='-') delay(500); // if the array contains an "-" at position i wait long
}
delay(2000); // stopping the program for 2000 milliseconds to have a longer break
}
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