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int ledPin = D2;

void setup() {
  // We want to tell the Argon that we'll use
  // D2 as an output pin.
  pinMode(ledPin, OUTPUT);
}

void loop() {

  // Exercise 1
  // First... On
  digitalWrite(ledPin, HIGH);   // Turn ON the LED pins
  delay(3000);               // Wait for 1000mS = 1 second
  // Now... Off
  digitalWrite(ledPin, LOW);   // Turn OFF the LED pins
  delay(3000);               // Wait for 1000mS = 1 second
  // rinse + repeat          

}
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