#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

#include "DHT.h"
#define DHTPIN 7     // what pin we're connected to    
#define DHTTYPE DHT22   // DHT 22  (AM2302)
DHT dht(DHTPIN, DHTTYPE);

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
void setup() {
  Serial.begin(115200);
  dht.begin();
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 initialization failed"));
    while(true);
  }
 
}
void loop() {

  int h = dht.readHumidity();
  float t = dht.readTemperature();
  float f = dht.readTemperature(true);
  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(15, 0);
  display.print("DHT sensor monitor");

  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 20);
  display.print("Temperature:");
  display.print(t);
  display.println(" *C");
  
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 40);
  display.print("Humidity:   ");
  display.print(h);
  display.println(" %");
  display.display();
}