#include <LiquidCrystal.h>

const float BETA = 3950;
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);

  lcd.begin(16, 2);
  lcd.print("Temperature:");
}

void loop() {
  // put your main code here, to run repeatedly:
  int analogValue = analogRead(A0);
  float celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;

  if (celsius > 50) {
    digitalWrite(13, HIGH);
  } else {
    digitalWrite(13, LOW);
  }

  lcd.setCursor(0, 1);
  String text = String(celsius) + "\xDF\C";
  lcd.print(text);

  for (int i = 0; i < 16 - text.length(); i++) {
    lcd.print(" ");
  }

  delay(250);
}