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

// #define DHTPIN A0
#define DHTPIN 3
#define DHTTYPE DHT22
LiquidCrystal_I2C lcd(0x27, 16, 2);
DHT dht(DHTPIN, DHTTYPE);
int Relay = 2; // กำหนดขาใช้งาน



void setup() {
  lcd.init();
  Serial.begin(9600);
  dht.begin();

//  pinMode(D2, INPUT_PULLUP);
//  pinMode(D3, INPUT_PULLUP);

  pinMode(5, INPUT_PULLUP);
  pinMode(6, INPUT_PULLUP);
  pinMode(Relay, OUTPUT); // กำหนดขาทำหน้าที่ให้ขา 2 เป็น OUTPUT
  digitalWrite(Relay, HIGH);

}

void loop() {
  float temperatureC = dht.readTemperature();
  float temperatureF = dht.readTemperature(true);
  float humidity = dht.readHumidity();

  int switch1 = digitalRead(5);
  int switch2 = digitalRead(6);

  if (switch1 == LOW) {
    Serial.println("Celsius");
    Serial.print("Temperature: ");
    Serial.print(temperatureC);
    Serial.println("C");

    lcd.clear();
    lcd.setCursor(0,0); 
    lcd.print("TEMP : Celsius"); 
    lcd.setCursor(0,1); 
    lcd.print("TEMP : "); 
    lcd.print(temperatureC); 
    lcd.print((char)223);
    lcd.print("C");

  } else if (switch2 == LOW) {
    Serial.println("Fahrenheit");
    Serial.print("Temperature: ");
    Serial.print(temperatureF);
    Serial.println("F");

    lcd.clear();
    lcd.setCursor(0,0); 
    lcd.print("TEMP : Fahrenheit"); 
    lcd.setCursor(0,1); 
    lcd.print("TEMP :  "); 
    lcd.print(temperatureF); 
    lcd.print((char)223);
    lcd.print("F");
  }

    else if (temperatureC < 35 && humidity < 75 ) {
    digitalWrite(Relay, LOW);
    lcd.clear();
    Serial.println("TEMP < 35: HUM < 75");
    Serial.println("Relay :  OFF");

    lcd.clear();
    lcd.setCursor(0,0); 
    lcd.println("TEMP<35 HUM<75"); 
    lcd.setCursor(0,1); 
    lcd.print("Relay :  OFF"); 

  }


    else if (temperatureC > 35 && humidity > 75 ) {
    digitalWrite(Relay, HIGH); 
    lcd.clear();
    Serial.println("TEMP > 35: HUM > 75");
    Serial.println("Relay :  ON");

    lcd.clear();
    lcd.setCursor(0,0); 
    lcd.println("TEMP>35 HUM>75"); 
    lcd.setCursor(0,1); 
    lcd.print("Relay :  ON"); 

  }
  delay(500);
}