#include "DHTesp.h"
#define DHTPIN 12       // DHT22 data pin at 12
#define PIRPIN 27       // PIR motion sensor pin
#define BUZZERPIN 5      // Digital pin connected to the buzzer
#define TRIGPIN 15        // HC-SR04 Trig pin
#define ECHOPIN 14        // HC-SR04 Echo pin

DHTesp dhtSensor;
int motionDetected = 0; // flag to indicate motion detection
int ledPin = 13;        // built-in LED pin
const float maxTemperature = 45.0; 
// Set the maximum temperature limit
const float minTemperature = 10.0; 
// Set the minimum temperature limit
const float maxHumidity = 80.0;    
// Set the maximum humidity limit
const float minHumidity = 40.0;    
// Set the minimum humidity limit
void setup() {
  dhtSensor.setup(DHTPIN, DHTesp::DHT22);
  // serial monitor begin
  Serial.begin(9600);  
  pinMode(PIRPIN, INPUT);    // PIR input
  pinMode(ledPin, OUTPUT);   // LED output
  pinMode(BUZZERPIN, OUTPUT);   // Buzzer OUTPUT
  pinMode(TRIGPIN, OUTPUT);  // HC-SR04 Trig pin
  pinMode(ECHOPIN, INPUT);   // HC-SR04 Echo pin

    // Initialize LED control
  ledcSetup(0, 5000, 8); // LEDC channel 0, 5000 Hz, 8-bit depth
  ledcAttachPin(ledPin, 0); // Attach LED to channel 0
}

float getUltrasonicDistance() {
  digitalWrite(TRIGPIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGPIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGPIN, LOW);

  return pulseIn(ECHOPIN, HIGH) * 0.0343 / 2; 
  // Speed of sound is approximately 343 meters/second
}

void loop() {
  float temperature = dhtSensor.getTemperature(); // Float temperature
  float humidity = dhtSensor.getHumidity();       // Float humidity
  motionDetected = digitalRead(PIRPIN);          // Digital read from PIR

  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" C\t");
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.print(" %\t");

    // Check if temperature exceeds the limits
  if (temperature > maxTemperature || temperature < minTemperature) {
    Serial.println("ALERT: Temperature out of range!");
  }

  // Check if humidity exceeds the limits
  if (humidity > maxHumidity || humidity < minHumidity) {
    Serial.println("ALERT: Humidity out of range!");
  }


  // Simulate Ultrasonic sensor distance
  float distance = getUltrasonicDistance();

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  // Check if the water level is above the maximum threshold
  if (distance <= 10.0) { // Set thareshold Distance 
    // Water level is too high, sound the buzzer
    digitalWrite(ledPin, HIGH); // turn on the LED
    tone(BUZZERPIN, 1000);       
    // turn on buzzer
    Serial.println("Water level too High! Alarm activated.");
  } else {
    // Water level is within the safe range, turn off the buzzer
    digitalWrite(ledPin, LOW);      // turn off the LED
    noTone(BUZZERPIN);               
    // turn off buzzer
    Serial.println ("Water level is Normal.");
  }
  delay(2000); //delay of 2 sec


  if (motionDetected == HIGH) {
    Serial.println("Motion Detected! Someone is at the Door");
    digitalWrite(ledPin, HIGH); // turn on the LED
    tone(BUZZERPIN, 1000);       
    // turn on buzzer
  } else {
    Serial.println("No Motion Detected");
    digitalWrite(ledPin, LOW); // turn off the LED
    noTone(BUZZERPIN);          
    // turn off buzzer
  }

  delay(2000); // delay of 2 sec
}