#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,20,4);  
const float BETA = 3950;
void setup()
{
  Serial.begin(9600);
  lcd.init();                  
  lcd.backlight();
}
  byte Char[] = {
  0b01110,
  0b11111,
  0b11111,
  0b11111,
  0b01110,
  0b00000,
  0b00000,
  0b00000,
};
byte Char1[] = {
  0b00100,
  0b01010,
  0b00100,
  0b11111,
  0b00100,
  0b00100,
  0b01010,
  0b10001,
};
byte Char2[] = {
  0b00000,
  0b01010,
  0b01010,
  0b01010,
  0b00000,
  0b10001,
  0b01010,
  0b00100,
};
byte Char3[] = {
  0b10001,
  0b01010,
  0b11011,
  0b01010,
  0b00000,
  0b00100,
  0b01010,
  0b10001,
};
void loop()
{
  lcd.home();
  int analogValue = analogRead(A0);
  float celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  lcd.home();
  lcd.print("Temperature: ");
  lcd.print(celsius); 
  lcd.print(char(223));
  lcd.println("C");
  delay(500); 
  lcd.clear();
  lcd.createChar(0, Char);
  lcd.home();
  lcd.write(0);
  delay(500);
  lcd.clear();
  lcd.createChar(0, Char1);
  lcd.home();
  lcd.write(0);
  delay(500);
  lcd.clear();
  lcd.createChar(0, Char2);
  lcd.home();
  lcd.write(0);
  delay(500);
  lcd.clear();
  lcd.createChar(0, Char3);
  lcd.home();
  lcd.write(0);
  delay(500);
  lcd.clear();
}