//Define variables

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>
#define DHTPIN 8
#define DHTTYPE DHT22
DHT dht (DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);
int PinRelay = 13;// Digital pin relay
int buttonPin = 2;// Digital pin where the button is connected.
bool buttonState = true;
void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
Serial.println("Sistem Monitoring Suhu");

lcd.begin(16, 2);
dht.begin();
}
void loop() {
// put your main code here, to run repeatedly:
float t = dht.readTemperature();
float h = dht.readHumidity();
pinMode(PinRelay, OUTPUT); //LED pin as an output.
pinMode(buttonPin, INPUT); // Button pin as an input.
delay(1000);
//Menampilkan di LCD
lcd.setCursor(0,0);
lcd.println("Suhu=");
lcd.print(t);
lcd.println(" C");
lcd.setCursor(0,1);
lcd.println("Lembab=");
lcd.print(h);
lcd.println("%");

//Menampilkan di serial monitor
Serial.println("Suhu=");
Serial.print(t);
Serial.println(" C");
Serial.println("Kelembaban =");
Serial.print(h);
Serial.println(" %");

// Mengatur batas suhu untuk mengontrol LED
if (t<=30){ 
digitalWrite(PinRelay,LOW); //LED menyala jika suhu kurang dari 30C
}else if(t>30){
digitalWrite(PinRelay,HIGH);//LED mati jika suhu lebih dari 40C
}

delay(1000);//jeda 4 detik
}