int led1=2;
  int led2=4;
  int push=21;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(led1,OUTPUT);
  pinMode(led2,OUTPUT);
  pinMode(push,INPUT_PULLUP);

}

void loop() {
   
  if(digitalRead(21)==LOW){
    digitalWrite(led1,HIGH);
    digitalWrite(led2,HIGH);
    delay(1000);
  }
  else{
    digitalWrite(led1,LOW);
    digitalWrite(led2,LOW);
    delay(1000);
  }

  // put your main code here, to run repeatedly:
   // this speeds up the simulation
}