#define LedGreen 26
#define LedBlue 27
#define LedPurple 14
#define LedYellow 12

void setup() {
  pinMode(LedGreen, OUTPUT);
  pinMode(LedBlue, OUTPUT);
  pinMode(LedPurple, OUTPUT);
  pinMode(LedYellow, OUTPUT);
}

void loop() {
  digitalWrite(LedGreen, HIGH);
  digitalWrite(LedBlue, LOW);
  digitalWrite(LedPurple, LOW);
  digitalWrite(LedYellow, LOW);
  delay(500);
  digitalWrite(LedGreen, LOW);
  digitalWrite(LedBlue, HIGH);
  digitalWrite(LedPurple, LOW);
  digitalWrite(LedYellow, LOW);
  delay(500);
  digitalWrite(LedGreen, LOW);
  digitalWrite(LedBlue, LOW);
  digitalWrite(LedPurple, HIGH);
  digitalWrite(LedYellow, LOW);
  delay(500);
  digitalWrite(LedGreen, LOW);
  digitalWrite(LedBlue, LOW);
  digitalWrite(LedPurple, LOW);
  digitalWrite(LedYellow, HIGH);
  delay(500);
  digitalWrite(LedGreen, LOW);
  digitalWrite(LedBlue, LOW);
  digitalWrite(LedPurple, HIGH);
  digitalWrite(LedYellow, LOW);
  delay(500);
  digitalWrite(LedGreen, LOW);
  digitalWrite(LedBlue, HIGH);
  digitalWrite(LedPurple, LOW);
  digitalWrite(LedYellow, LOW);
  delay(500);
}