#include <DHT.h>

#define DHTPIN   2
#define DHTTYPE  DHT22

#define LEDPIN   3   // mesmo pino do teste que piscou

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  dht.begin();
  pinMode(LEDPIN, OUTPUT);
  digitalWrite(LEDPIN, LOW); // começa apagado
}

void loop() {
  float t = dht.readTemperature();
  float h = dht.readHumidity();

  Serial.print("Temp: ");
  Serial.print(t);
  Serial.print("  | Umid: ");
  Serial.println(h);

  bool risco = false;

  if (!isnan(t) && t > 30) {
    risco = true;
  }

  if (!isnan(h) && h < 35) {
    risco = true;
  }

  if (risco) {
    digitalWrite(LEDPIN, HIGH); // acende LED
  } else {
    digitalWrite(LEDPIN, LOW);  // apaga LED
  }

  delay(1000);
}