#include "DHT.h"

#define DHTPIN 12    // Digital pin connected to the DHT sensor
#define DHTTYPE DHT22   // DHT 22
#define LEDCNT 10  // Set number of LEDs in the bar graph

DHT dht(DHTPIN, DHTTYPE);

// Array of pins for LEDs in the bar graph
int ledPins[] = {
  2, 3, 4, 5, 6, 7, 8, 9, 10, 11
};

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

  for (int thisLed = 0; thisLed < LEDCNT; thisLed++) {
    pinMode(ledPins[thisLed], OUTPUT);
  }
  dht.begin();
}

void loop() {
  // Wait a few seconds between measurements.
  delay(2000);

  // Reading temperature or humidity takes about 250 milliseconds
  float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();


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

  // Count turn on LEDs in the bar graph
  int ledCntOn = (int)(t / 4);

  for (int thisLed = 0; thisLed < LEDCNT; ++thisLed) {
      if (ledCntOn > thisLed)
        digitalWrite(ledPins[thisLed], HIGH);
      else
        digitalWrite(ledPins[thisLed], LOW);
  }

  Serial.print(F("Temperature: "));
  Serial.print(t);
  Serial.print(F("°C\n"));
}