아두이노 온도 lcd 패널에 출력 및 릴레이 작동

#include "DHT.h"
#include <LiquidCrystal_I2C.h>
 
#define DHTPIN 2
#define DHTTYPE DHT22
 
DHT dht(DHTPIN, DHTTYPE);
 
LiquidCrystal_I2C lcd(0x27, 16, 2);
 
const int Htmp = 35; //최고 온도
const int Mtmp = 25; //중간 온도
const int Ltmp = 15; //낮은 온도
int RelayP = 3;
 
float Tc; //현재 온도 상태
 
 
void setup() {
  Serial.begin(9600);
  dht.begin();
 
 
 
  pinMode(RelayP, OUTPUT);
 
  lcd.init();
  lcd.backlight();
}
 
void loop() {
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();
  delay(1000);
 
  Tc = (int)temperature;
 
 
  if ( Tc <= Htmp && Tc != 0) {
    digitalWrite(RelayP, HIGH);
  } else {
    digitalWrite(RelayP, LOW);
  }
 
 
  Serial.print((int)temperature); Serial.print(" *C, ");
  Serial.print((int)humidity); Serial.println(" %");
 
  String humi = "Humi : ";
  humi += (String)humidity;
  humi += "%";
 
  String temp = "Temp : ";
  temp += (String)temperature;
  temp += "C";
 
 
 
  lcd.setCursor(0, 0);
  lcd.print(humi);
 
  lcd.setCursor(0, 1);
  lcd.print(temp);
 
  delay(1500);
}