// include the library code:
#include <LiquidCrystal_I2C.h>

// Creates an LCD object. Parameters: (rs, enable, d4, d5, d6, d7)
LiquidCrystal_I2C lcd(0x27, 16, 2);
int keadaanVariasi = 0;

void setup() {
  attachInterrupt(digitalPinToInterrupt(2), variasi, RISING);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Temperature:");
  Serial.begin(9600);
}

void loop() {
  switch (keadaanVariasi) {
    case 0:
      BacaCelcius();
      break;
    case 1:
      BacaFahrenheit();
      break;
    case 2:
      BacaKelvin();
      break;
  }
}

void variasi() {
  delay(100);
  keadaanVariasi++;
  Serial.print("keadaanVariasi=");
  Serial.println(keadaanVariasi);
  if (keadaanVariasi > 2) keadaanVariasi = 0;
}

void BacaCelcius() {
  float c = analogRead(A0);
  c = (c * 5) / 1023;
  c = c * 100;
  lcd.setCursor(0, 1);
  lcd.print(c);
  lcd.print((char)223);
  lcd.print(" C");
}

void BacaFahrenheit() {
  float c = analogRead(A0);
  c = (c * 5) / 1023;
  c = c * 100;
  float f = (c * 9) / 5 + 32;
  lcd.setCursor(0, 1);
  lcd.print(f);
  lcd.print((char)223);
  lcd.print(" F");
}
void BacaKelvin() {
  float c = analogRead(A0);
  c = (c * 5) / 1023;
  c = c * 100;
  float k = (c + 273.15);
  lcd.setCursor(0, 1);
  lcd.print(k);
  lcd.print((char)223);
  lcd.print(" K");
}