#include <LiquidCrystal_I2C.h>

#define LCD_ADDR 0x27
#define LCD_COLUMNS 16
#define LCD_ROWS 2

LiquidCrystal_I2C lcd(LCD_ADDR, LCD_COLUMNS, LCD_ROWS);

const float BETA = 3950; // Beta Coefficient of thermistor

const int pHSensorPin = A1;          // Analog pin connected to the pH sensor
const int turbiditySensorPin = A2;   // Analog pin connected to the turbidity sensor
const int temperatureSensorPin = A0; // Analog pin connected to the temperature sensor

const float pHOffset = 7.0;
const float voltageNeutral = 2.5;
const float sensitivity = 0.59;

void setup() {
  Serial.begin(9600);
  lcd.begin(16, 2);
  lcd.backlight();
}

void loop() {
  int sensorValue_pH = analogRead(pHSensorPin);
  float voltage_pH = sensorValue_pH * (5.0 / 1023.0);

  int sensorValue_turbidity = analogRead(turbiditySensorPin);
  float actual_pH = pHOffset - (voltage_pH - voltageNeutral) / sensitivity;
  
  // Check turbidity value, pH value, and water level to determine water condition
  if (sensorValue_turbidity > 500 || actual_pH < 6.5 || actual_pH > 7.5) {
    // If turbidity is high or pH is outside the safe range
    Serial.println("Water condition: Not clean");

    // Check pH level to determine acidity, neutrality, or alkalinity
    if (actual_pH < 6.5) {
      Serial.println("Water pH is acidic");
    } else if (actual_pH > 7.5) {
      Serial.println("Water pH is alkaline");
    } else {
      Serial.println("Water pH is neutral");
    }

    // Add code here for the filtering process or any actions for not clean water
  } else {
    // If turbidity is low and pH is within the safe range
    Serial.println("Water is clean");
  }
  delay(1000);

  int analogValue = analogRead(temperatureSensorPin);
  float celcius = 1 / (log(1 / (1023.0 / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;

  Serial.print("Temperature: ");
  Serial.print(celcius);
  Serial.println(" ℃");

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(celcius, 2); // Show temperature with two decimal places
  lcd.print(" ");
  lcd.write(0xDF);
  lcd.print("C");

  lcd.setCursor(0, 1);
  if (celcius < 18) {
    lcd.print("Initiate heating");
  } else if (celcius > 40) {
    lcd.print("Initiate cooling");
  } else {
    lcd.print("Normal condition");
  }

  delay(2000);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Turbid: ");
  lcd.print(sensorValue_turbidity);
  lcd.setCursor(0, 1);
  lcd.print("pH: ");
  lcd.print(actual_pH, 2); // Show pH with two decimal places
  delay(1000);

  lcd.clear();
  lcd.setCursor(0, 0);
  if (sensorValue_turbidity > 500 || actual_pH < 6.5 || actual_pH > 7.5) {
    // If turbidity is high or pH is outside the safe range
    lcd.print("Not clean");

    // Check pH level to determine acidity, neutrality, or alkalinity
    lcd.setCursor(0, 1);
    if (actual_pH < 6.5) {
      lcd.print("Water pH is acidic");
    } else if (actual_pH > 7.5) {
      lcd.print("Water pH is alkaline");
    } else {
      lcd.print("Water pH is neutral");
    }
  } else {
    lcd.print("Water is clean");
  }
  delay(1000);
}