#include <DHT.h>

#define DHTPIN 2
#define SWTPIN 3
#define DHTTYPE DHT22
#define TIMEDHT 1000

unsigned long timerDHT = 0;

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  pinMode(SWTPIN, INPUT_PULLUP);
  Serial.begin(9600);
  dht.begin();
}

void loop() {
  // Wait for a time between measurements
  if ((millis() - timerDHT) > TIMEDHT) {
    // Update the timer
    timerDHT = millis();

    // Reading temperature or humidity takes about 250 milliseconds!
    // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
    float h = dht.readHumidity();
    // Read temperature as Celsius (the default)
    float t = dht.readTemperature();
    // Read temperature as Fahrenheit (isFahrenheit = true)
    float f = dht.readTemperature(false);

    // Check if any reads failed and exit early (to try again)
    if (isnan(h) || isnan(t) || isnan(f)) {
      Serial.println(F("Failed to read from DHT sensor!"));
      return;
    }

    // Where: HIGH = Temperature, LOW = Humidity
    if (digitalRead(SWTPIN) == HIGH) {
      Serial.print(F("Temperature: "));
      Serial.println(t);
    } else {
      Serial.print(F("% Humidity: "));
      Serial.println(h);
    }
  }
}