#include <DHT.h>

#define DHTPIN 12   
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

const int RELAY_PIN = 13;

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

  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, LOW); 
}

void loop() {
  float humidity = dht.readHumidity(); 
  if (isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  
  if (humidity <= 50) {
    digitalWrite(RELAY_PIN, LOW); 
  } else {
    digitalWrite(RELAY_PIN, HIGH); 
  }

  delay(2000); 
}