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


const int RedLed = 23;
const int GreenLed = 16;
const int NTC = 34;

int lcdColumns = 16;
int lcdRows = 2;

LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows);

void setup() 
{
  Serial.begin(115200);
  pinMode(RedLed, OUTPUT);
  pinMode(GreenLed, OUTPUT);
  pinMode(NTC, INPUT);

  lcd.init();
  lcd.backlight();

  lcd.setCursor(0, 0);
  lcd.print("Hello, RE23176");
  delay(3000); 
  lcd.clear();
}

void loop() 
{
  const float BETA = 3950; 
  int analogValue = analogRead(NTC); 
  float celsius = 1 / (log(1 / (4095. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;

  
  Serial.print("Temperature: ");
  Serial.print(celsius);
  Serial.println("°C");

  digitalWrite(RedLed, LOW); 
  digitalWrite(GreenLed, LOW);
  
  if (celsius >= 27) 
  {
    digitalWrite(RedLed, HIGH);
    delay(350);
    digitalWrite(RedLed, LOW);
    delay(350);
    digitalWrite(GreenLed, LOW);
  } 
  else 
  {
    digitalWrite(RedLed, LOW);
    digitalWrite(GreenLed, HIGH);
  }

  
  lcd.setCursor(0, 0);
  lcd.print("Temperature:"); 
  lcd.setCursor(0, 1);
  lcd.print(celsius, 1); 
  lcd.print(" C");
  
  delay(500); 
}