#include<Wire.h>
#include<LiquidCrystal_I2C.h>
#include<DHT.h>

LiquidCrystal_I2C mylcd(0x27, 16, 2);
DHT dht2(2, 22);
volatile int tem;
volatile int hum;

void setup() {
  // put your setup code here, to run once:
  mylcd.init();
  mylcd.backlight();
  dht2.begin();
  tem = 0;
  hum = 0;

  pinMode(2, INPUT);
  pinMode(7, INPUT);
  pinMode(8, INPUT);
}

void loop() {
  tem = dht2.readTemperature();
  hum = dht2.readHumidity();

  mylcd.clear();
  mylcd.setCursor(0, 0);
  mylcd.print(String("TEM: ") + String(tem) + String(" ") + String(char(0xdf)) + String("C"));
  mylcd.setCursor(0, 1);
  mylcd.print(String("HUM: ") + String(hum) + String(" %"));
  delay(200);

  if (digitalRead(8)) {
    mylcd.clear();
    mylcd.setCursor(0, 0);
    mylcd.print(String("M: ") + String(tem*1.8 + 32) + String(" ") + String(char(0xdf)) + String("F"));
    mylcd.setCursor(0, 1);
    mylcd.print(String("HUM: ") + String(hum) + String(" %"));
    delay(3000);
  }

  if (digitalRead(7)) {
    mylcd.clear();
    mylcd.setCursor(0, 0);
    mylcd.print(String("K: ") + String(tem + 273.15) + String(" ") + String("F"));
    mylcd.setCursor(0, 1);
    mylcd.print(String("HUM: ") + String(hum) + String(" %"));
    delay(3000);
  }
}