// ============ Include Library ===================
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include "DHTesp.h"
// ============ End Include Library ===================
// ============ Define Pin ===================
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define DHT_PIN 18
// ============ End Define Pin ==============
// ============ Class ===================
Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
DHTesp dht;
// ============ End Class ===================
// ============ Variabel ===================
float temperature, humadity;
float celcius, fahrenheit, kelvin;
// ============ End Variabel ===================
// ============ Function ===================
void dht_init();
void dht_read();
void convert_temperature();
void oled_init();
void oled_display();
// ============ End Function ===================
void setup() {
  Serial.begin(9600);
  dht_init();
  oled_init();
}

void loop() {
  dht_read();
  convert_temperature();
  oled_display();
}

void dht_init() {
  dht.setup(DHT_PIN, DHTesp::DHT22);
}
void dht_read() {
  TempAndHumidity  data = dht.getTempAndHumidity();
  temperature = data.temperature;
  humadity = data.humidity;
}
void convert_temperature() {
  celcius = temperature;
  fahrenheit = (9 / 5 * celcius) + 32;
  kelvin = celcius + 273.15;
}
void oled_init() {
  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("failed to start SSD1306 OLED"));
    while (1);
  }
}
void oled_display() {
  oled.clearDisplay();
  oled.setTextSize(1);
  oled.setTextColor(SSD1306_WHITE);
  oled.setCursor(0, 0);
  oled.println("Celcius: ");
  oled.setCursor(0, 10);
  oled.println(celcius);
  oled.setCursor(0, 20);
  oled.println("Fahrenheit: ");
  oled.setCursor(0, 30);
  oled.println(fahrenheit);
  oled.setCursor(0, 40);
  oled.println("Kelvin: ");
  oled.setCursor(0, 50);
  oled.println(kelvin);
  oled.setCursor(64, 0);
  oled.println("Humadity: ");
  oled.setCursor(64, 10);
  oled.println(humadity);
  oled.display();
}