//Libraries
#include <DHT.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <Servo.h>

#define DHTPIN 2  // Pin for DHT22
#define DHTTYPE DHT22   // DHT 22 (AM2302)
DHT dht(DHTPIN, DHTTYPE);

#define ONE_WIRE_BUS 3  // Pin for DS18B20
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

#define trigPin 4 //Pin for HC-SR04 Trigger
#define echoPin 5 // Pin for HC-SR04 Echo

#define pirPin 6        // Pin for PIR sensor

// Servo declarations
Servo servo1;
Servo servo2;
Servo servo3;
Servo servo4;

long duration;
int distance;

void setup() {  
  Serial.begin(9600);

  // Initialize DHT22
  dht.begin();

  //Initialize DS18B20
  sensors.begin();

  // Initialize HC-SR04
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  // Initialize PIR sensor
  pinMode(pirPin, INPUT);

  // Attach servos to PWM pins
  servo1.attach(9); // Servo 1 on Pin 9
  servo2.attach(10); // Servo 2 on Pin 10
  servo3.attach(11); // Servo 3 on Pin 11
  servo4.attach(12); // Servo 4 on Pin 12
  }

void loop() {
  // Reading from DHT22
 float h = dht.readHumidity();
 float t = dht.readTemperature();
 Serial.print("Humidity: "); Serial.print(h); Serial.print("% ");
 Serial.print("Temperature: "); Serial.print(t); Serial.println("°C");
              
 // Reading from DS18B20
 sensors.requestTemperatures();
 float dsTemp = sensors.getTempCByIndex(0);
 Serial.print("DS18B20 Temperature: "); Serial.print(dsTemp); Serial.println("°C"); 
 
 // Reading from HC-SR04 
 digitalWrite(trigPin, LOW);
 delayMicroseconds(2); 
 digitalWrite(trigPin, HIGH); 
 delayMicroseconds(10); 
 digitalWrite(trigPin, LOW);  
 duration = pulseIn(echoPin, HIGH);
 distance = duration * 0.034 / 2; 
 Serial.print("Distance: "); Serial.print(distance); Serial.println(" cm");

  // Reading from PIR 
  int motion = digitalRead(pirPin);
  if (motion == HIGH) {
   Serial.println("Motion detected!");
  } else {    
    Serial.println("No motion.");  
  }
  
  // Move servo1 based on temperature from DHT22  
  if (t > 25) {    
    servo1.write(90);   // Move to 90 degrees  if temp > 25°C  
  } else {    
    servo1.write(0);    // Move to 0 degrees otherwise  
  }
  // Move servo2 based on temperature from DS18B20
  if (dsTemp > 30) {    
    servo2.write(180);  // Move to 180 degrees if temp > 30°C  
  } else {
    servo2.write(0);    // Move to 0 degrees otherwise  
  }

  // Move servo3 based on distance from HC-SR04 
  if (distance < 20) {
   servo3.write(90);   // Move to 90 degrees if distance < 20 cm
  } else {
   servo3.write(0);    // Move to 0 degrees otherwise  
  }

  // Move servo4 based on PIR sensor
  if (motion == HIGH) {    
    servo4.write(180);  // Move to 180 degrees if motion detected  
  } else {    
   servo4.write(0);    // Move to 0 degrees otherwise  
  }

 delay(1000);  // Delay for 1 second before repeating}
 }