// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin GPIO18 as an output.
  pinMode(18, OUTPUT);
  pinMode(17, OUTPUT); 
  pinMode(16, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(18, HIGH); // turn the LED on
  delay(1000);             // wait for 1000 milliseconds
  digitalWrite(18, LOW);  // turn the LED off
  delay(1000);             // wait for 1000 milliseconds
  digitalWrite(17, HIGH); // turn the LED on
  delay(1100);             // wait for 1200 milliseconds
  digitalWrite(17, LOW);  // turn the LED off
  delay(1100);             // wait for 1200 milliseconds
  digitalWrite(16, HIGH); // turn the LED on
  delay(1200);             // wait for 1400 milliseconds
  digitalWrite(16, LOW);  // turn the LED off
  delay(1200);             // wait for 1400 milliseconds
}