#include <DHT.h>

const int dhtPin = 4;
const int ledPin = 2;
const int ultrasonicTrig = 5;
const int ultrasonicEcho = 18;

DHT dht(dhtPin, DHT22);

void setup() {
  Serial.begin(115200);
  dht.begin();
  pinMode(ledPin, OUTPUT);
  pinMode(ultrasonicTrig, OUTPUT);
  pinMode(ultrasonicEcho, INPUT);
}

void loop() {
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  long duration, distance;

  digitalWrite(ultrasonicTrig, LOW);
  delayMicroseconds(2);
  digitalWrite(ultrasonicTrig, HIGH);
  delayMicroseconds(10);
  digitalWrite(ultrasonicTrig, LOW);

  duration = pulseIn(ultrasonicEcho, HIGH);
  distance = (duration / 2) / 29.1;

  if ((temperature > 39) & (distance > 200)) {
    digitalWrite(ledPin, HIGH);
  } else {
    digitalWrite(ledPin, LOW);
  }

  Serial.print("Temperature: ");
  Serial.println(temperature);
  Serial.print("Humidity: ");
  Serial.println(humidity);
  Serial.print("Distance: ");
  Serial.println(distance);

  delay(1000);
}