//thermostat for Gorenje Fridge
//3 sensors inside The fridge, 1 sensor in freezer
//and door sensor for light


#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <math.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);

const int relayPin2 = 2; //fridge compressor
const int relayPin3 = 3; //freezer compressor
const int relayPin4 = 4; //fridge fan compresor
const int relayPin5 = 5; //light
const int buttonPin = 6; //light switch

const int sensorPin1 = A0; //middle of the fridge sensor
const int sensorPin2 = A1; //cooling board sensor
const int sensorPin3 = A2; //drawer in the botom of the fridge sensor
const int sensorPin4 = A3; //freezer sensor

const float temperatureCorrection1 = 0.0;
const float temperatureCorrection2 = 0.0;
const float temperatureCorrection3 = 0.0;
const float temperatureCorrection4 = 0.0;

int X1 = 0, X2 = 0, X3 = 0;

float readTemperature1();
float readTemperature2();
float readTemperature3();
float readTemperature4();

float currentTemperature1 = 0.0;
float currentTemperature2 = 0.0;
float currentTemperature3 = 0.0;
float currentTemperature4 = 0.0;

float sumOfTemperatures1 = 0.0;
float sumOfTemperatures2 = 0.0;
float sumOfTemperatures3 = 0.0;
float sumOfTemperatures4 = 0.0;

int temperatureCount = 0;

unsigned long previousMillisTemp = 0;
unsigned long intervalTemp = 20000;  // 20 sekúnd v milisekundách

unsigned long previousMillisPrint = 0;
unsigned long intervalPrint = 60000;  // 1 minúta v milisekundách

void setup() {
  
  Serial.begin(9600);
  lcd.begin(20, 4);
  lcd.backlight();

  pinMode(buttonPin, INPUT);
  pinMode(relayPin2, OUTPUT);
  pinMode(relayPin3, OUTPUT);
  pinMode(relayPin4, OUTPUT);
  pinMode(relayPin5, OUTPUT);

    // Vytvorenie vlastného znaku pre stupne
  byte degrees[8] = {0b01110, 0b01010, 0b01110, 0b00000, 0b00000, 0b00000, 0b00000, 0b00000};
  lcd.createChar(0, degrees);
}

void loop() {

  Serial.print("T1: ");
  Serial.print(currentTemperature1);
  Serial.println("°C");
  Serial.print("T2: ");
  Serial.print(currentTemperature2);
  Serial.println("°C");
  Serial.print("T3: ");
  Serial.print(currentTemperature3);
  Serial.println("°C");
  Serial.print("T4: ");
  Serial.print(currentTemperature4);
  Serial.println("°C");
  
 unsigned long currentMillis = millis();

  // Meranie teplôt každých 20 sekúnd
  if (currentMillis - previousMillisTemp >= intervalTemp) {
    currentTemperature1 = readTemperature1();
    currentTemperature2 = readTemperature2();
    currentTemperature3 = readTemperature3();
    currentTemperature4 = readTemperature4();

    currentTemperature1 += temperatureCorrection1;
    currentTemperature2 += temperatureCorrection2;
    currentTemperature3 += temperatureCorrection3;
    currentTemperature4 += temperatureCorrection4;

    // Resetovanie časovača pre meranie teplôt
    previousMillisTemp = currentMillis;
  }

  // Pridávanie teplôt pre výpočet priemeru
  sumOfTemperatures1 += currentTemperature1;
  sumOfTemperatures2 += currentTemperature2;
  sumOfTemperatures3 += currentTemperature3;
  sumOfTemperatures4 += currentTemperature4;
  
  temperatureCount++;

  // Vypíš priemer každej teploty každú minútu
  if (temperatureCount >= 3 && currentMillis - previousMillisPrint >= intervalPrint) {
    float averageTemperature1 = sumOfTemperatures1 / temperatureCount;
    float averageTemperature2 = sumOfTemperatures2 / temperatureCount;
    float averageTemperature3 = sumOfTemperatures3 / temperatureCount;
    float averageTemperature4 = sumOfTemperatures4 / temperatureCount;

    // Vypíš priemer (tu môžeš pridať ďalšie akcie)
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("T1 :" + String(averageTemperature1, 1) + (char)0 + "C ");

    lcd.setCursor(0, 1);
    lcd.print("T2 :" + String(averageTemperature2, 1) + (char)0 + "C ");

    lcd.setCursor(0, 2);
    lcd.print("T3 :" + String(averageTemperature3, 1) + (char)0 + "C ");

    lcd.setCursor(0, 3);
    lcd.print("T4 :" + String(averageTemperature4, 1) + (char)0 + "C ");

    // Podmienky pre riadenie relé
    //chladnicka
  if (averageTemperature1 > 6) {
    X1 = 1;
  } else if (averageTemperature1 < 4) {
    X1 = 0;
  }

    //chladiaca doska
  if (averageTemperature2 > 2) {
    X2 = 1;
  } else if (averageTemperature2 < -10) {
    X2 = 0;
  }

    //suflik
  if (averageTemperature3 > 2.5) {
    X3 = 1;
  } else if (averageTemperature3 < 1) {
    X3 = 0;
  }

    //spinanie kompresoru chladnicky
  if ((X1 + X2 + X3) == 3) {
    digitalWrite(relayPin2, HIGH);
  } else if ((X1 + X2 + X3) < 3) {
    digitalWrite(relayPin2, LOW);
  }

    //mraznička
  if (averageTemperature4 > -17) {
    digitalWrite(relayPin3, HIGH);
  } else if (averageTemperature4 < -19) {
    digitalWrite(relayPin3, LOW);
  }

    //ventilátor
  if (averageTemperature2 > 4) {
    digitalWrite(relayPin4, LOW);
  } else if (averageTemperature2 < 2) {
    digitalWrite(relayPin4, HIGH);
  }

    // Resetovanie časovača pre výpis priemeru
    previousMillisPrint = currentMillis;

    // Resetuj počítadlá pre nový cyklus
    temperatureCount = 0;
    sumOfTemperatures1 = 0.0;
    sumOfTemperatures2 = 0.0;
    sumOfTemperatures3 = 0.0;
    sumOfTemperatures4 = 0.0;
  }


  // Ovládanie svetla
  int buttonState = digitalRead(buttonPin);
  if (buttonState == HIGH) {
    digitalWrite(relayPin5, HIGH);
  } else {
    digitalWrite(relayPin5, LOW);
  }
  
  delay(10);
  }


  float readTemperature1() {
    int sensorValue1 = analogRead(sensorPin1);
    float temperature1 = 1 / (log(1 / (1023. / sensorValue1 - 1)) / 3950 + 1.0 / 298.15) - 273.15;
    return temperature1;
  }
  
    float readTemperature2() {
    int sensorValue2 = analogRead(sensorPin2);
    float temperature2 = 1 / (log(1 / (1023. / sensorValue2 - 1)) / 3950 + 1.0 / 298.15) - 273.15;
    return temperature2;
  }

    float readTemperature3() {
    int sensorValue3 = analogRead(sensorPin3);
    float temperature3 = 1 / (log(1 / (1023. / sensorValue3 - 1)) / 3950 + 1.0 / 298.15) - 273.15;    
    return temperature3;
  }

    float readTemperature4() {
    int sensorValue4 = analogRead(sensorPin4);
    float temperature4 = 1 / (log(1 / (1023. / sensorValue4 - 1)) / 3950 + 1.0 / 298.15) - 273.15;    
    return temperature4;
  }