#include <Servo.h>
#include <DHT.h>
#include <LiquidCrystal.h>

#define DHTPIN 2       // Pin for DHT22 sensor
#define DHTTYPE DHT22  // Change this to DHT22
#define PIRPIN 3       // Pin for PIR Motion Sensor
#define LIGHTPIN A0    // Pin for Light Sensor (LDR)
#define LEDPIN 13      // Pin for LED
#define RELAYPIN 8     // Pin for Relay (Fan Control)
#define BUZZERPIN 9    // Pin for Buzzer
#define SERVOPIN 10    // Pin for Servo Motor

DHT dht(DHTPIN, DHTTYPE);
Servo servo;
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

int motionCounter = 0;

void setup() {
  Serial.begin(9600);
  pinMode(PIRPIN, INPUT);
  pinMode(LIGHTPIN, INPUT);
  pinMode(LEDPIN, OUTPUT);
  pinMode(RELAYPIN, OUTPUT);
  pinMode(BUZZERPIN, OUTPUT);
  
  dht.begin();
  servo.attach(SERVOPIN);
  servo.write(0);  // Door closed initially
  
  lcd.begin(16, 2);
  lcd.print("Smart Classroom");
  delay(2000);
  lcd.clear();
}

void loop() {
  // Reading sensors
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  int lightLevel = analogRead(LIGHTPIN);
  int motionDetected = digitalRead(PIRPIN);

  // Automatic Lighting Control
  if (lightLevel < 500) {
    digitalWrite(LEDPIN, HIGH);  // Turn on LED lights if it's dark
  } else {
    digitalWrite(LEDPIN, LOW);   // Turn off LED lights if it's bright
  }

  // Fan Control based on Temperature
  if (temperature > 25.0) {
    digitalWrite(RELAYPIN, HIGH);  // Turn on the fan
  } else {
    digitalWrite(RELAYPIN, LOW);   // Turn off the fan
  }

  // Door Control and Motion Counter
  if (motionDetected) {
    servo.write(90);  // Open the door
    motionCounter++;  // Increment counter for each detection
    delay(1000);      // Debounce delay for motion detection
  } else {
    servo.write(0);   // Close the door
  }

  // Emergency Buzzer
  if (temperature > 40.0) {  // Example condition for an emergency
    digitalWrite(BUZZERPIN, HIGH);  // Sound the buzzer
  } else {
    digitalWrite(BUZZERPIN, LOW);   // Turn off the buzzer
  }

  // Displaying values on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C");

  lcd.setCursor(0, 1);
  lcd.print("Hum: ");
  lcd.print(humidity);
  lcd.print(" %");

  lcd.setCursor(10, 1);
  lcd.print("Count:");
  lcd.print(motionCounter);

  delay(2000);  // Update every 2 seconds
}