#include <DHTesp.h>
#include <ESP32Servo.h>

// Pin Definitions
#define TRIG_PIN 18
#define ECHO_PIN 5
#define SERVO_PIN 19
#define BUZZER_PIN 22
#define DHT_PIN 34

// Constants
#define DISTANCE_THRESHOLD 10
#define TEMP_THRESHOLD 55

// Objects
DHT dht(DHT_PIN, DHT22);
Servo myservo;

// Variables
int distance;
float temperature;
bool alertState = false;

void setup() {
  Serial.begin(115200);

  // Initialize components
  myservo.attach(SERVO_PIN);
  dht.begin();

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
}

void loop() {
  // Measure distance
  distance = getDistance();
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  // Control servo based on distance
  if (distance <= DISTANCE_THRESHOLD) {
    myservo.write(90);
  } else {
    myservo.write(0);
  }

  // Measure temperature
  temperature = dht.readTemperature();
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" C");

  // Control buzzer based on distance and temperature
  if (distance <= DISTANCE_THRESHOLD || temperature >= TEMP_THRESHOLD) {
    digitalWrite(BUZZER_PIN, HIGH);
  } else {
    digitalWrite(BUZZER_PIN, LOW);
  }

  delay(1000);
}

int getDistance() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  
  int duration = pulseIn(ECHO_PIN, HIGH);
  return duration * 0.034 / 2;
}