#include <LiquidCrystal.h>
#include <math.h>

// RS=12, E=11, DB4=5, DB5=4, DB6=3, DB7=2
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
  lcd.begin(16, 2);
  lcd.setCursor(0, 0);
  lcd.print("Datchik NTC");
  lcd.setCursor(0, 1);
  lcd.print("Zagruzka...");
  delay(2000);
  lcd.clear();
}

void loop() {
  int raw = analogRead(A0);

  // Termistor PASTDA (GND tomonda) bo'lsa:
  float resistance = 10000.0 * raw / (1023.0 - raw);

  // Steinhart-Hart formulasi
  float tempK = 1.0 / (log(resistance / 10000.0) / 3950.0 + 1.0 / 298.15);
  float tempC = tempK - 273.15;

  // Satr 1: Kelvin
  lcd.setCursor(0, 0);
  lcd.print("Tk=");
  lcd.print(tempK, 1);
  lcd.print(" K      ");

  // Satr 2: Celsius
  lcd.setCursor(0, 1);
  lcd.print("Tc=");
  lcd.print(tempC, 1);
  lcd.print((char)223);
  lcd.print("C      ");

  delay(1000);
}