// After running the simulator, click on the DS18B20 chip to change the temperature
// Chip by bonnyr, source code: https://github.com/bonnyr/wokwi-ds1820-custom-chip/

#include <OneWire.h>
#include <DallasTemperature.h>
#include <LiquidCrystal_I2C.h> 
#include "EncButton.h"
#include "PIDController.h"

#define LED1 8
#define LED2 9
#define LED3 11

#define BTN1 5
#define BTN2 6
#define BTN3 7

#define CLK 2                        
#define DT 3                       
#define SW 4                          

#define NTC_PIN A0
#define outputPin 10
#define mosfet_pin 12

#define __Kp 30 
#define __Ki 0.7 
#define __Kd 200

EncButton en(CLK, DT, SW);
OneWire oneWire(10);
DallasTemperature sensor(&oneWire);

LiquidCrystal_I2C lcd(0x3F,20,4);

const float BETA = 3950;

PIDController pid;

float readNTCHandler()
{ 
    int analogValue = analogRead(NTC_PIN);
    float celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
    return celsius;
    
}

int set_temperature = 1;
int clockPin; 
int clockPinState;
float debounce = 0;
int encoder_btn_count = 0;
float temperature_value_c = 0.0;

void setup() {
  lcd.init();
  pinMode(mosfet_pin, OUTPUT); // MOSFET output PIN
  pid.begin();          // initialize the PID instance
  pid.setpoint(150);    // The "goal" the PID controller tries to "reach"
  pid.tune(__Kp, __Ki,__Kd);    // Tune the PID, arguments: kP, kI, kD
  pid.limit(0, 255);    // Limit the PID output between 0 and 255, this is important to get rid of integral windup!
  en.setBtnLevel(HIGH);
  en.setEncType(EB_STEP4_LOW);
}

void set_temp()
{
  if (encoder_btn_count == 2) // check if the button is pressed twice and its in temperature set mode.
  { 
    lcd.clear(); // clear the display
    lcd.setCursor(16, 0); // set the diplay cursor
    lcd.print("Set Temp."); // Print Set Temp. on the display
    lcd.setCursor(45, 25); // set the cursor
    lcd.print(set_temperature);// print the set temperature value on the display
  }
}

void read_encoder() // In this function we read the encoder data and increment the counter if its rotaing clockwise and decrement the counter if its rotating counter clockwis
{
  if (en.leftH()) {
    Serial.println("left"); // if this condition is true then the encoder is rotaing counter clockwise and we decremetn the counter
    set_temperature = set_temperature - 3;  // decrmetn the counter.
    if (set_temperature < 1 )set_temperature = 1; // if the counter value is less than 1 the set it back to 1

  }
  if(en.rightH()){
    Serial.println("right");
    set_temperature = set_temperature + 3;
    if (set_temperature > 150 ) set_temperature = 150;
  }

  if (en.press())   //If we detect LOW signal, button is pressed
  {
    if ( millis() - debounce > 80) { //debounce delay
      encoder_btn_count++; // Increment the values 
      if (encoder_btn_count > 2) encoder_btn_count = 1;
    }
    debounce = millis(); // update the time variable
  }
}


void loop(void) {
  read_encoder(); //Call The Read Encoder Function
  set_temp();
sensor.requestTemperatures();
  float temperature_value_c = sensor.getTempCByIndex(0);
  int output = pid.compute(temperature_value_c);
  analogWrite(mosfet_pin, output);
  pid.setpoint(set_temperature);

  lcd.setCursor(16, 0);
  lcd.print("Cur Temp.");
  lcd.setCursor(45, 25);
  lcd.print(temperature_value_c);
  lcd.display(); // Оновлення виводу на LCD дисплеї
    Serial.print(temperature_value_c); // Виведення значення температури в консоль
    Serial.print("   "); // Пропуск пустого місця
    Serial.println(output); // Виведення обчисленого значення в консоль
    delay(200); 
}