#include <LiquidCrystal_I2C.h>
//TMP36 Pin Variable
int sensorPin = A0; 
LiquidCrystal_I2C lcd(0x27, 16, 2);
int BUTTON_PIN = 12;
int buttonstatus = 0;
int buttonZaehler = 0;
int letzterStatus = 0;

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

void loop() {
  int reading = analogRead(sensorPin);
  float voltage = reading * 5.0;
  voltage /= 1024.0;
  float temperatureC = (voltage - 0.5) * 100;
  float temperatureF = temperatureC * 1.8 + 32;
  buttonstatus = digitalRead(BUTTON_PIN);

  if(buttonstatus != letzterStatus)
  {
    if (buttonstatus == 1) 
    {
      buttonZaehler++;
    }

    else 
    {
      lcd.setCursor(0,0);
      lcd.print("Celsius:        ");
      lcd.setCursor(0,1);
      lcd.print(temperatureC);
    }
  }

  if (buttonZaehler % 2 == 0)
  {
      lcd.setCursor(0,0);
      lcd.print("Fahrenheit:     ");
      lcd.setCursor(0,1);
      lcd.print(temperatureF);
      buttonZaehler = 0;
  }

  else 
  {
    lcd.setCursor(0,0);
    lcd.print("Celsius:        ");
    lcd.setCursor(0,1);
    lcd.print(temperatureC);
  }
  letzterStatus = buttonstatus; 
  Serial.println(buttonZaehler);
  if(temperatureC > 25){
    digitalWrite(7, HIGH);
  }
  delay(10);
}