#include <ESP32Servo.h>

// PIR Motion Sensor
int PIR_PIN = 18;
int LED_PIN = 12;
int PIR_STATE = LOW;

// HC-SR04 Ultrasonic Sensor
int TRIG_PIN = 34;
int ECHO_PIN = 26;

// ESP32 Servo
Servo servo;
int SERVO_PIN = 16;

void setup() {
  pinMode(PIR_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  servo.attach(SERVO_PIN);
}

void loop() {
  int PIR_VALUE = digitalRead(PIR_PIN);
  if (PIR_VALUE == HIGH) {
    if (PIR_STATE == LOW) {
      digitalWrite(LED_PIN, HIGH);
      PIR_STATE = HIGH;
    }
  } else {
    digitalWrite(LED_PIN, LOW);
    PIR_STATE = LOW;
  }

  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  long duration = pulseIn(ECHO_PIN, HIGH);
  int distance = duration * 0.034 / 2;

  if (distance <= 100) {
    servo.write(0);
  } 
  else {
    servo.write(90);
  }

  delay(10);
}