#include <OneWire.h> 
#include <DallasTemperature.h> 
#include <LiquidCrystal_I2C.h> 

#define ONE_WIRE_BUS 6

OneWire oneWire(ONE_WIRE_BUS); 
DallasTemperature sensors(&oneWire);
LiquidCrystal_I2C lcd(0x27, 16, 2); 

const int buttonPin = 2; 
int buttonState = 0;
int lastButtonState = 0;

void setup(void)
{
  sensors.begin();
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  pinMode(buttonPin, INPUT);
}

void loop(void)
{ 
  buttonState = digitalRead(buttonPin);

  if (buttonState != lastButtonState && buttonState == HIGH) {
    displayTemperature();
  }

  lastButtonState = buttonState;
}

void displayTemperature() {
  lcd.clear();
  sensors.requestTemperatures();
  lcd.setCursor(0, 0);
  lcd.print("Temperature: ");
  lcd.print(sensors.getTempCByIndex(0));
  lcd.print((char)223);
  lcd.print("C");

  Serial.print("Temperature: ");
  Serial.print(sensors.getTempCByIndex(0));
  Serial.print((char)176);
  Serial.println("C");
}