int red = 21;
int yellow = 19;
int green = 18;

int sw1 = 32;
int sw2 = 33;
int sw3 = 25;

void setup() {
  // put your setup code here, to run once:
  pinMode(red, OUTPUT);
  pinMode(yellow, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(sw1, INPUT);
  pinMode(sw2, INPUT);
  pinMode(sw3, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.println("Hello, ESP32!");
  if (digitalRead(sw1) == 1)
  {
    digitalWrite(green, HIGH);
  }
  if(digitalRead(sw2) == 1)
  {
    digitalWrite(yellow, HIGH);
  }
  if(digitalRead(sw3) == 1)
  {
    digitalWrite(red, HIGH);
  }
  else 
  {
    digitalWrite(green, LOW);
    digitalWrite(yellow, LOW);
    digitalWrite(red, LOW);
  }
}