Alternate Blink

Alternately Blink two LEDs. Requires the addition of a single LED to Blink. Drive one LED HIGH while the other LED is driven LOW, delay, and reverse the situation --- Simple.

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void setup() {
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
}

void loop() {
  digitalWrite(13, HIGH);
  digitalWrite(12, LOW);
  delay(1000);
  digitalWrite(13, LOW);
  digitalWrite(12, HIGH);
  delay(1000);
}

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