#include <DHT.h>          // DHT library for temperature and humidity
#include <Wire.h>         // For I2C communication (pH sensor and light sensor if needed)
#include <Adafruit_Sensor.h>
#include <OneWire.h>      // For DS18B20 sensor
#include <DallasTemperature.h>

#define DHTPIN 15         // DHT sensor pin
#define DHTTYPE DHT22     // Define DHT sensor type (DHT22)
DHT dht(DHTPIN, DHTTYPE);

#define TEMP_THRESHOLD_HEATER 30     // Example temperature <=temp in Celsius
#define TEMP_THRESHOLD_COOLER 37     // Example temperature >=temp in Celsius
#define HUMIDITY_THRESHOLD 70 // Example humidity threshold in %

#define LEVEL_TRIGGER_PIN 32  // HC-SR04 Trigger pin
#define LEVEL_ECHO_PIN 33     // HC-SR04 Echo pin
#define PH_SENSOR_PIN 25      // Define pH sensor pin (analog)
#define LIGHT_SENSOR_PIN 34   // Define light sensor pin (analog)
#define DS18B20_PIN 4         // DS18B20 sensor pin (liquid temperature)

#define HEATER_PIN 14         // Heater control pin
#define PUMP_PIN 12           // Pump control pin
#define MOTOR_PIN 13          // DC motor control pin
#define PELTIER_PIN 27        // Peltier module control pin
#define LED_PIN 26            // LED light control pin

float phValue = 0.0;           // pH value to be read from sensor
int lightIntensity = 0;        // Light intensity value
float temperature = 0.0, humidity = 0.0;
long duration;                 // Duration of pulse from HC-SR04
float distance;                // Calculated distance from HC-SR04
float liquidTemperature = 0.0; // Liquid temperature from DS18B20

// Setup for DS18B20
OneWire oneWire(DS18B20_PIN);
DallasTemperature sensors(&oneWire);

void setup() {
  Serial.begin(9600);
  
  // Initialize sensors
  dht.begin();
  pinMode(LEVEL_TRIGGER_PIN, OUTPUT);
  pinMode(LEVEL_ECHO_PIN, INPUT);
  pinMode(PH_SENSOR_PIN, INPUT);
  pinMode(LIGHT_SENSOR_PIN, INPUT);
  
  // Initialize output devices
  pinMode(HEATER_PIN, OUTPUT);
  pinMode(PUMP_PIN, OUTPUT);
  pinMode(MOTOR_PIN, OUTPUT);
  pinMode(PELTIER_PIN, OUTPUT);
  pinMode(LED_PIN, OUTPUT);

  // Turn off all output devices initially
  digitalWrite(HEATER_PIN, LOW);
  digitalWrite(PUMP_PIN, LOW);
  digitalWrite(MOTOR_PIN, LOW);
  digitalWrite(PELTIER_PIN, LOW);
  digitalWrite(LED_PIN, LOW);
}

void loop() {
  // Read temperature and humidity
  temperature = dht.readTemperature();
  humidity = dht.readHumidity();
  
  // Read pH level (analog)
  int phValueRaw = analogRead(PH_SENSOR_PIN);
  phValue = (phValueRaw * (14.0 / 4095.0)); // Scale raw value to pH range (0-14)

  // Read light intensity
  lightIntensity = analogRead(LIGHT_SENSOR_PIN);

  // Read level sensor (HC-SR04)
  distance = readLevelSensor();

// Read liquid temperature from DS18B20
  sensors.requestTemperatures();
  liquidTemperature = sensors.getTempCByIndex(0); // Assuming one DS18B20 sensor

  // Classify the pH value
  String phClassification = classifyPH(phValue);
  // Print sensor readings
  Serial.print("Room Temperature: "); Serial.print(temperature); Serial.println(" *C");
  Serial.print("Humidity: "); Serial.print(humidity); Serial.println(" %");
  Serial.print("pH: "); Serial.println(phValue); Serial.print(" - ");
  Serial.println(phClassification); // Print the classification
  Serial.print("Light Intensity: "); Serial.println(lightIntensity);
  Serial.print("Water Level Distance: "); Serial.print(distance); Serial.println(" cm");
  Serial.print("Liquid Temperature: "); Serial.print(liquidTemperature); Serial.println(" C");
  
  // Control logic for output devices
  controlHeater();
  controlPump(distance);
  controlDCMotor();
  controlPeltier();
  controlLED();
  
  delay(2000); // Adjust delay as per required sampling rate
}
String classifyPH(float ph) {
  if (ph < 7.0) {
    return "Acidic";
  } else if (ph == 7.0) {
    return "Neutral";
  } else {
    return "Alkaline";
  }
}
// Function to read level sensor using HC-SR04
float readLevelSensor() {
  // Trigger the sensor
  digitalWrite(LEVEL_TRIGGER_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(LEVEL_TRIGGER_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(LEVEL_TRIGGER_PIN, LOW);

  // Read the echo pin and calculate distance
  duration = pulseIn(LEVEL_ECHO_PIN, HIGH);
  distance = duration * 0.034 / 2; // Convert time to distance (cm)
  
  return distance;
}

void controlHeater() {
  if (liquidTemperature < TEMP_THRESHOLD_HEATER) {
    digitalWrite(HEATER_PIN, HIGH); // Turn on heater if temperature is below threshold
    Serial.println("Heater ON");
  } else {
    digitalWrite(HEATER_PIN, LOW); // Turn off heater
    Serial.println("Heater OFF");
  }
}

void controlPump(float distance) {
  if (distance > 20) { // Assume distance > 20 cm indicates low water level
    digitalWrite(PUMP_PIN, HIGH);
    Serial.println("Pump ON");
  } else {
    digitalWrite(PUMP_PIN, LOW);
    Serial.println("Pump OFF");
  }
}

void controlDCMotor() {
  if (humidity > HUMIDITY_THRESHOLD) {
    digitalWrite(MOTOR_PIN, HIGH); // Run motor if humidity is high
    Serial.println("DC Motor ON");
  } else {
    digitalWrite(MOTOR_PIN, LOW);
    Serial.println("DC Motor OFF");
  }
}

void controlPeltier() {
  if (liquidTemperature > TEMP_THRESHOLD_COOLER) {
    digitalWrite(PELTIER_PIN, HIGH); // Cool down if temperature exceeds threshold
    Serial.println("Peltier ON (Cooling)");
  } else {
    digitalWrite(PELTIER_PIN, LOW);
    Serial.println("Peltier OFF");
  }
}

void controlLED() {
  if (lightIntensity < 500) { // Assuming a threshold for low light
    digitalWrite(LED_PIN, HIGH); // Turn on LED if light intensity is low
    Serial.println("LED ON");
  } else {
    digitalWrite(LED_PIN, LOW);
    Serial.println("LED OFF");
  }
}