#include <dht.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define DHT22_PIN 2
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1

float Temperature;
float Humidity;


int16_t x1, y1;
uint16_t Laenge, Hoehe;

/*
String tempString = String(Temperature, 1) + "C";
String humString = String(Humidity, 1) + "%";
*/

dht DHT;

float getTemperature() {
  return DHT.temperature;
}

float getHumidity() {
  return DHT.humidity;
}

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);


void setup() {
  pinMode(DHT22_PIN, INPUT);

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
}

void loop() {
  DHT.read22(DHT22_PIN);
  display.clearDisplay();
  
  Temperature = getTemperature();
  String tempString = String(Temperature, 1) + "C";

  display.setTextColor(SSD1306_WHITE);
  display.setTextSize(1);
  display.getTextBounds(tempString, 0, 0, &x1, &y1, &Laenge, &Hoehe);
  display.setCursor(64 - (Laenge / 2), 16);
  display.print(tempString);


  Humidity = getHumidity();
  String humString = String(Humidity, 1) + "%";

  display.setTextColor(SSD1306_WHITE);
  display.setTextSize(1);
  display.getTextBounds(humString, 0, 0, &x1, &y1, &Laenge, &Hoehe);
  display.setCursor(64 - (Laenge / 2), 32);
  display.print(humString);

  display.display();
}