Oefening 3C

int ledOne = D4;
int ledTwo = D3;

void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(ledOne, OUTPUT);
  pinMode(ledTwo, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(ledOne, HIGH);
  digitalWrite(ledTwo, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(100);

  digitalWrite(ledOne, LOW);
  delay(100);

  digitalWrite(ledOne, HIGH);
  digitalWrite(ledTwo, LOW);
  delay(100);

  digitalWrite(ledOne, LOW);
  digitalWrite(ledTwo, LOW);
  delay(100);
}