#include <Servo.h>

const int trigPin = D23;
const int echoPin = D21;
const int relayPin = D2;
const int pirPin = D6;
const int servoPin = D5;

Servo servo;
long duration;
int distance;
boolean motionDetected = false;

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(relayPin, OUTPUT);
  pinMode(pirPin, INPUT);
  servo.attach(servoPin);  // Attach the servo to the correct pin
  servo.write(0);  // Initialize servo at 0 degrees
  Serial.begin(9600);
}

void loop() {
  // Ultrasonic sensor distance measurement
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin3, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;

  // Prints the distance on the Serial Monitor
  Serial.print("Distance: ");
  Serial.println(distance);
  
  // PIR sensor input
  motionDetected = digitalRead(pirPin);

  if (distance < 200)
  {
    servo.write(90);  // Move the servo to 90 degrees
    digitalWrite(relayPin, HIGH);  // Turn on the relay
  } 
  else if (motionDetected == HIGH) 
  {  // Assuming HIGH indicates motion detected
    digitalWrite(relayPin, HIGH);  // Turn on the relay
  } 
  else 
  {
    servo.write(0);  // Move the servo back to 0 degrees
    digitalWrite(relayPin, LOW);  // Turn off the relay
  }
  
  delay(2000);
}