#include <ESP32Servo.h>

#define TRIG_PIN 2
#define ECHO_PIN 4
#define SERVO_PIN 19
#define DISTANCE_THRESHOLD 50  
Servo myservo;

void setup() {
  Serial.begin(115200);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  myservo.attach(SERVO_PIN);
  myservo.write(0); 
}

long readUltrasonicDistance() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  return pulseIn(ECHO_PIN, HIGH) * 0.034 / 2;
}

void loop() {
  long distance = readUltrasonicDistance();
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  if (distance < DISTANCE_THRESHOLD) {
    myservo.write(90); 
    Serial.println("Servo: Closed");

  } else {
    myservo.write(0);  
    Serial.println("Servo: Open");
  }
  delay(100);
}