// Anode = small , Cathode = big , resistor is always connected to anode 
//and cathode is connected to grnd
// Btn of One end is connected to vcc and another to pin 4  and same to the gnd via
// resistor.
int led =2;
int btn =4;
void setup() {
  // put your setup code here, to run once:
  pinMode(2, OUTPUT);
  pinMode(4, INPUT);
  Serial.begin(115200);
 // Serial.println("Hello, ESP32!");
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
  if(digitalRead(4)==HIGH){
    digitalWrite(2, HIGH);
    //Serial.println("LED IS ON ..");
    delay(500);
  }
  else{
    digitalWrite(2,LOW);
  }
}