#include <OneWire.h> //One-wire interface for temp sensor
#include <SimpleRotary.h> //Rotary encoder
#include <DallasTemperature.h> //Rotary encoder
#include <LiquidCrystal_I2C.h> // LCD library
#include <Servo.h>

#define NTC_PIN    A0 //Pin A0

#define HALF_POWER 127 // 50% of 255
#define FULL_POWER 255

int tasviePin = 5; // LED Digital Pin With Tasvie
int ledPin = 7; // LED Digital Pin with PWM
int buzzerPin = 8; // buzzer Pin
int heaterPin = 13; // heater Pin

int phPin = A7; // buzzer Pin
const int BEST_PH = 7;
int cycleHeater = 0;




//pin Ultrasonik
#define trigPin 2
#define echoPin 3
#define WATER_THRESHOLD 100 

//Variables
int chk;
float temp; //Stores temperature value


bool blink = false;
bool heaterOn = false;
unsigned long currentTime = 0;
unsigned long heater_start_time = 0;

const int lcdColumns = 20;
const int lcdRows = 4;
const int i2c_addr = 0x27;

long distance;

unsigned long highTime = millis() / 1000; // convert to seconds

Servo heatingServo;

// Initialize the DHT sensor and LCD
LiquidCrystal_I2C lcd(i2c_addr, lcdColumns, lcdRows);

float readTemperature() {
  int analogValue = analogRead(NTC_PIN);
  temp = 1 / (log(1 / (1023. / analogValue - 1)) / 3950 + 1.0 / 298.15) - 273.15;
  temp = temp + 0.5 * cycleHeater;

}

void update_distance() {
  long duration;
  digitalWrite(trigPin, LOW); 
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration/2) / 29.1;
}

void setup() {
  //set the temperature sensor
  Serial.begin(9600);
  lcd.init(); // initialize the lcd 
  lcd.backlight();
  //set the heater
  pinMode(heaterPin, OUTPUT);
  heatingServo.attach(heaterPin);
  heatingServo.write(105);



  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);


  //set the buzzer
  pinMode(buzzerPin, OUTPUT);

  pinMode(phPin, INPUT);

  pinMode(ledPin, OUTPUT);
  pinMode(tasviePin, OUTPUT);


}


void loop() {
  //take the current time
  currentTime = millis();

  if (currentTime / 1000 - highTime < 3) { // first 3 seconds
    analogWrite(ledPin, 128);
  } else { // last 6 seconds
    analogWrite(ledPin, 255);
    if(currentTime/1000 - highTime  == 9){
      highTime = currentTime / 1000;
    }
    
  }
  readTemperature();

  update_distance();
  float pH = map(analogRead(phPin), 0, 1023, 0.0, 14.0);

  if(pH < BEST_PH){
    analogWrite(tasviePin, 255);
  }else{
    analogWrite(tasviePin, 0);
  }

  // Control the heater
  if(temp > 24 && temp < 29){
    heaterOn = false;
  }else  if (temp < 24.0) {
    heaterOn = true;
    heatingServo.write(120);
  } else if (temp > 29.0) {
    heaterOn = false;
    heatingServo.write(105);
  }

  if(heaterOn){
      if(currentTime - heater_start_time >= 1500){
        cycleHeater = cycleHeater +  1;
        heater_start_time = currentTime; // Reset the start time
      }
  }

  // If the conditions are not as expected, sound the buzzer
  if (temp < 24.0 || temp > 29.0 || distance < WATER_THRESHOLD) {
    // tone(buzzerPin, 1000);     // Generate a sound
  } else {
    noTone(buzzerPin);    
  }

  lcd.setCursor(0, 0);
  lcd.print("Water Level: ");
  lcd.print(distance, 1);
  lcd.setCursor(0, 1);
  lcd.print("Temp: ");
  lcd.print(temp, 1);
  lcd.setCursor(0, 2);
  lcd.print("pH Value: ");
  lcd.println(pH, 2); // Print pH value with 2 decimal places


  //wait until 100ms have passed (10Hz), since main loop has been started
  while(millis() < currentTime + 100) {
  }
}