void setup() {
  pinMode(25, INPUT);
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(18,OUTPUT);
}

void loop() {
  int ptmeter = analogRead(25);
  Serial.println(ptmeter);
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
  if (ptmeter>2000)
  {
    digitalWrite(18, HIGH);
  }
  else
  {
    digitalWrite(18, LOW);
  }
}