#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <math.h>
#define rele 7
#define ntc A2
#define ldr A2
#define button_up 2
#define button_down 4
#define button_joy A3
#define rgb_blue 7
#define rgb_green 9
#define rgb_red 10
#define led 13
int a = 30;
const char degreeSymbol = 223;
LiquidCrystal_I2C lcd(0x27, 16, 2);

int oldButtonUpPressed = 0;
int oldButtonDownPressed = 0;
int oldButtonjoyPressed = 0;
int flag = 0;
int switchState = 0;
int oldflag = 0;
int time = 0;

void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  pinMode(rele, OUTPUT);
  pinMode(rgb_blue, OUTPUT);
  pinMode(rgb_green, OUTPUT);
  pinMode(rgb_red, OUTPUT);
  pinMode(led, OUTPUT);
  pinMode(ntc, INPUT);
  pinMode(ldr, INPUT);
  pinMode(button_up, INPUT);
  pinMode(button_down, INPUT);
  pinMode(button_joy, INPUT);
  lcd.setCursor(4, 0);
  lcd.print("MADE  IN");
  lcd.setCursor(4, 1);
  lcd.print("TEXNOLAB");
  delay(2000);
  lcd.clear();
}
void loop() {
  int button_up_value = digitalRead(button_up);
  int button_down_value = digitalRead(button_down);
  int button_joy_value = digitalRead(button_joy);
  int ldr_value = analogRead(ldr);

Serial.println(button_joy);
  lcd.setCursor(4, 1);
  lcd.print(a);
  lcd.print(degreeSymbol);
  lcd.print(" ");
  if (button_up_value == 0) {
    if (millis() - oldButtonUpPressed > 150) {
      a++;
      oldButtonUpPressed = millis();
    }
  }
  if (button_down_value == 0) {
    if (millis() - oldButtonDownPressed > 150) {
      a--;
      oldButtonDownPressed = millis();
    }
  }

  if (digitalRead(button_joy) == 0) {
    digitalWrite(13, HIGH);
    if (millis() - oldflag > 150) {
      flag = !flag;
      time = millis();
      oldflag = millis();
    }
  }
  if (flag == 1) {
    if (millis() - oldButtonjoyPressed > 300) {

      digitalWrite(rgb_blue, 1);
      lcd.setCursor(0, 1);
      lcd.print(temp_measurement());
      lcd.print(degreeSymbol);
      lcd.print(" ");

      lcd.setCursor(11, 1);
      lcd.print((millis() - time) / 1000);
      lcd.print(" ");
      
      oldButtonjoyPressed = millis();

      if (temp_measurement() <= a) {
        digitalWrite(rgb_red, 0);
        digitalWrite(rgb_green, 1);
        digitalWrite(rele, 1);
        lcd.setCursor(8, 1);
        lcd.print("AK");

      } else {
        digitalWrite(rgb_red, 1);
        digitalWrite(rgb_green, 0);
        digitalWrite(rele, 0);
        lcd.setCursor(8, 1);
        lcd.print("PS");
      }

      if (ldr_value > 750) {
        lcd.setCursor(15, 1);
        lcd.print("A");


      } else {
        lcd.setCursor(15, 1);
        lcd.print("G");
      }
   
    }
  } else {
    lcd.setCursor(0, 0);
    lcd.print("TEM IDT SV TM  I");
    lcd.setCursor(0, 1);
    lcd.print("---     -- --  -");
    digitalWrite(rgb_blue, 0);
    digitalWrite(rgb_red, 0);
    digitalWrite(rgb_green, 0);
    digitalWrite(rele, 0);

    time = millis();
  }
}

int temp_measurement() {
  int ntc_value = analogRead(ntc);
  float v = ntc_value * 5.0 / 1024;
  float Rt = 10 * v / (5 - v);
  float tempK = 1 / (log(Rt / 10) / 3950 + 1 / (273.15 + 25));
  int tempC_f = tempK - 273.15;
  return tempC_f;
}