void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(27,OUTPUT); //RED
  pinMode(4, OUTPUT); //SKY BLUE
  pinMode(33, OUTPUT); //YELLOW
  
  

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(27,HIGH);
  delay(2000);
  digitalWrite(27,LOW);
  digitalWrite(33,HIGH);
  delay(2000);
  digitalWrite(33,LOW);
  digitalWrite(4,HIGH);
  delay(2000);
  digitalWrite(4,LOW);
}