#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <ThingSpeak.h> Knihovna thingu
#include <DHT.h> //Knihovna dht
#include <ESP8266WiFi.h> Knihovna ovladaciho prvku pro esp8266


#define OLED_RESET 0  // GPIO0
Adafruit_SSD1306 display(OLED_RESET);

#define DHTPIN D4
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

unsigned long myChannelNumber = 613230;
const char * myWriteAPIKey = "WJKU5V7M04ET9507";

const char* ssid = "***************";
const char* password = "*****************";

WiFiClient  client;
WiFiServer server(80);

#define LED 0

void setup() {
  pinMode(0, OUTPUT); //-D7
  digitalWrite(0, HIGH);

  Serial.begin(115200);
  delay(10);
  dht.begin(); //Nacteni senzoru
  // by default, we'll generate the high voltage from the 3.3v line internally! (neat!)
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3C (for the 64x48)
  display.display();

  // Pripojeni na wifi
  Serial.println();
  Serial.println();
  Serial.print("Pripojovani na ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi pripojena");

  // Start the server
  // server.begin();
  // Serial.println("Server started");
  // Vypsani ip
  Serial.println(WiFi.localIP());

  ThingSpeak.begin(client);

}

void loop()
{
  delay(2000);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);
  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  float f = dht.readTemperature(true);
  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t) || isnan(f))
  {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  //temp in c
  display.println("Teplota");
  display.print(t);
  display.println(" c");
  display.println("----------");
  display.println("----------");
  display.println("Vlhkost");
  display.print(h);
  display.println(" %");
  display.display();

  ThingSpeak.writeField(myChannelNumber, 1, h, myWriteAPIKey);
  delay(60000);


  ThingSpeak.writeField(myChannelNumber, 2, t, myWriteAPIKey);
  delay(60000);

}