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

// DHT Sensor PIN 15
const int DHT_PIN = 17;

// Instantiate dhtSensor obejct
DHTesp dhtSensor;

// OLED display width, in pixels
#define SCREEN_WIDTH 128 

// OLED display height, in pixels
#define SCREEN_HEIGHT 64 

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
  Serial.begin(115200);

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { 
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }

  // dht sensor setup
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);

  // Show initial display buffer contents on the screen --
  // the library initializes this with an Adafruit splash screen.
  display.display();

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

void loop() {
  //get temp and humidity
  TempAndHumidity  data = dhtSensor.getTempAndHumidity();

  //print in serial monitor
  Serial.println("Temp: " + String(data.temperature, 2) + "°C");
  Serial.println("Humidity: " + String(data.humidity, 1) + "%");
  Serial.println("---");

  //print in display
  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(0,0);
  display.println("Temp:" + String(data.temperature, 1) + "C");
  display.println("Humidity: " + String(data.humidity, 1) + "%");
  display.display();

  // compute period 20 ms
  delay(20);
}