#include <LiquidCrystal.h>
#include <DHT.h>

#define DHTPIN 6
#define DHTTYPE DHT22
#define TUP 4
#define TDN 3
#define OUT 5

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

void setup() {
  lcd.begin(16, 2);
  dht.begin();
  pinMode(TUP,INPUT_PULLUP);
  pinMode(TDN,INPUT_PULLUP);
  pinMode(OUT, OUTPUT);
}

float tempLast = 0, humLast = 0;
float tempSet = 38;
void loop() {
  float temperature;
  float humidity;
  
  temperature = dht.readTemperature();
  humidity = dht.readHumidity();
  if ((tempLast != temperature) || (humLast != humidity)) {
    tempLast = temperature;
    humLast = humidity;
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Temp: ");
    lcd.print(temperature);
    lcd.print(" \xDF");
    lcd.print("C");
    lcd.setCursor(0, 1);
    lcd.print("Hum: ");
    lcd.print(humidity);
    lcd.print(" %");
  }

  if (digitalRead(TUP) == LOW) {
    tempSet += .1;
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("T. Set: ");
    lcd.print(tempSet);
    lcd.print(" \xDF");
    lcd.print("C");
    delay(100);
  }

  if (digitalRead(TDN) == LOW) {
    tempSet -= .1;
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("T. Set: ");
    lcd.print(tempSet);
    lcd.print(" \xDF");
    lcd.print("C");
    delay(100);
  }

  if (tempSet > temperature) digitalWrite(OUT, HIGH);
  else digitalWrite(OUT, LOW);
}