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

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for SSD1306 display connected using I2C
#define OLED_RESET     -1 // Reset pin
#define SCREEN_ADDRESS 0x3C    //128x32
//#define SCREEN_ADDRESS 0x3D       //128x64 EI TOIMI miksi?
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

//temperature sensor setup
#include <DHT.h>  // TOIMII ARDUINOLLA, TÄSSÄ EI
#define DHT_SENSOR_PIN  14 // ESP32 pin to DHT11 sensor
#define DHT_SENSOR_TYPE DHT11
DHT dht_sensor(DHT_SENSOR_PIN, DHT_SENSOR_TYPE);

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

  dht_sensor.begin(); // initialize the DHT sensor

  // initialize the OLED object
  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }

  // Clear the buffer.
  display.clearDisplay();

}

void loop() {

  // read humidity
  float humi  = dht_sensor.readHumidity();
  // read temperature in Celsius
  float tempC = dht_sensor.readTemperature();

  // check whether the reading is successful or not
  if ( isnan(tempC) || isnan(humi)) {
    display.setCursor(0,0);    
    display.print("Failed to read from DHT sensor!");
  } else {
    display.setTextColor(WHITE);
    display.setCursor(30,15);
    display.setTextSize(2);
    display.print(humi,1);
    display.println( "%");
    display.setCursor(30,34);   
    display.print(tempC,1);
    display.println(" C");
    display.display();
  }

  // wait between readings
  delay(3000);
  display.clearDisplay();
  display.display();
  delay(500);

}