#include <ESP32Servo.h>
int sw = 4;
int relay = 17;
void setup()
{
  Serial.begin(115200);
  pinMode(sw, INPUT_PULLUP);
  pinMode(relay, OUTPUT);
}
void loop(){
  int val = digitalRead(sw);
  if(val==0){
    Serial.println(val);
    digitalWrite(relay, HIGH);
    delay(2000);
    digitalWrite(relay, LOW);
  }
}