// Level 2: police lights. Red LED on pin 2 and blue LED on pin 5 take turns.
const int redLedPin = 2;
const int blueLedPin = 5;

void setup() {
  pinMode(redLedPin, OUTPUT);
  pinMode(blueLedPin, OUTPUT);
}

void loop() {
  digitalWrite(redLedPin, HIGH);
  digitalWrite(blueLedPin, LOW);
  delay(300);
  digitalWrite(redLedPin, LOW);
  digitalWrite(blueLedPin, HIGH);
  delay(300);
}