#include <LiquidCrystal.h>

LiquidCrystal lcd(7, 8, 9, 10, 11, 12);

#define NTC_PIN A0
#define BETA 3950
#define R0 10000
#define T0 298.15

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

void loop() {
  int reading = analogRead(NTC_PIN);
  float resistance = R0 * (1023.0 / reading - 1.0);
  float tempK = 1.0 / (1.0/T0 + log(resistance/R0)/BETA);
  float tempC = tempK - 273.15;
  float tempF = (tempC * 9.0 / 5.0) + 32.0;

  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(tempC, 1);
  lcd.print(" C   ");

  lcd.setCursor(0, 1);
  lcd.print("    = ");
  lcd.print(tempF, 1);
  lcd.print(" F   ");

  delay(1000);
}