int red = 21;
int yellow = 4;
int green = 2;
int button = 13;
// int buttonState = digitalRead(button);
int lastState = HIGH;
int currentState = LOW;

void setup() {

pinMode(red, OUTPUT);
pinMode(yellow, OUTPUT);
pinMode(green, OUTPUT);

pinMode(button, INPUT_PULLUP);

  // put your setup code here, to run once:
  Serial.begin(115200);
  // Serial.println("Hello, ESP32!"+String(buttonState));
}

void loop() {
  if(digitalRead(button) == LOW ){
    digitalWrite(yellow, HIGH);
    delay(3000);
    digitalWrite(yellow, LOW);
    digitalWrite(red, HIGH);
    delay(5000);
    digitalWrite(yellow, HIGH);
    delay(2000);
    digitalWrite(yellow, LOW);
    digitalWrite(red, LOW);
    digitalWrite(green, HIGH);
    delay(3000);
    digitalWrite(green, LOW);
  }
  // put your main code here, to run repeatedly:
  
  // delay(10); // this speeds up the simulation
}