#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <SoftwareSerial.h> //Software Serial library
#include "DHT.h" // připojení knihovny DHT
SoftwareSerial espSerial(10, 11); //Pin 2 and 3 act as RX and TX. Connect them to TX and RX of ESP8266

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define DEBUG true
#define pinDHT 5
#define typDHT11 DHT11 // DHT 11

// Declaration for SSD1306 display connected using software SPI (default case):
#define OLED_MOSI 8
#define OLED_CLK 9
#define OLED_DC 7
#define OLED_CS 6
#define OLED_RESET 13
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,
OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);

String mySSID = "****"; // WiFi SSID
String myPWD = "******"; // WiFi Password
String myAPI = "*****"; // API Key
String myHOST = "api.thingspeak.com";
String myPORT = "80";
String tepFIELD = "field1";
String humField = "field2";
int teplota;
int vlhkost;

DHT mojeDHT(pinDHT, typDHT11);

void setup()
{
Serial.begin(9600);
mojeDHT.begin();
espSerial.begin(115200);

espData("AT+RST", 1000, DEBUG); //Reset the ESP8266 module
espData("AT+CWMODE=1", 1000, DEBUG); //Set the ESP mode as station mode
espData("AT+CWJAP=\""+ mySSID +"\",\""+ myPWD +"\"", 1000, DEBUG); //Connect to WiFi network
/*while(!esp.find("OK"))
{
//Wait for connection
}*/
delay(1000);

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

vypsani_hodnot_na_display(); // Draw 'stylized' characters

}

void loop(){
/* Here, I'm using the function random(range) to send a random value to the
ThingSpeak API. You can change this value to any sensor data
so that the API will show the sensor data
*/
// cidloDHT11
float tep = mojeDHT.readTemperature();
float vlh = mojeDHT.readHumidity();
// kontrola, jestli jsou načtené hodnoty čísla pomocí funkce isnan
if (isnan(tep) || isnan(vlh)) {
// při chybném čtení vypiš hlášku
Serial.println("Chyba při čtení z DHT senzoru!");
} else {
// pokud jsou hodnoty v pořádku,
// vypiš je po sériové lince
Serial.print("Teplota: ");
Serial.print(tep);
Serial.print(" stupnu Celsia, ");
Serial.print("vlhkost: ");
Serial.print(vlh);
Serial.println(" %");
}
// pauza pro přehlednější výpis
delay(2000);
// cidlo DHT11
teplota = (tep); // Send a random number between 1 and 1000
vlhkost = (vlh);
String sendData = "GET /update?api_key="+ myAPI +"&"+ tepFIELD +"="+String(teplota) +","+ "&field2" +"=" +String(vlhkost);
// String sendData = "GET /update?api_key="+ myAPI + "&field1" +"="+String(t) +","+ "&field2" +"=" +String(h);
Serial.print(sendData);
espData("AT+CIPMUX=1", 1000, DEBUG); //Allow multiple connections
espData("AT+CIPSTART=0,\"TCP\",\""+ myHOST +"\","+ myPORT, 1000, DEBUG);
espData("AT+CIPSEND=0," +String(sendData.length()+4),1000,DEBUG);
espSerial.find(">");
espSerial.println(sendData);
Serial.print("Value to be sent: ");
Serial.println(teplota);
Serial.println(vlhkost);

espData("AT+CIPCLOSE=0",1000,DEBUG);
delay(10000);
}

void vypsani_hodnot_na_display(void) {
display.clearDisplay();

display.setTextSize(2); // Normal 1:1 pixel scale
display.setTextColor(SSD1306_WHITE); // Draw white text
display.setCursor(0,0); // Start at top-left corner
display.println(F("Ahoj PC poradno!"));

/*display.setTextSize(1); // Draw 2X-scale text
display.setTextColor(SSD1306_BLACK, SSD1306_WHITE); // Draw 'inverse' text
display.println(3.141592);

display.setTextSize(1); // Draw 2X-scale text
display.setTextColor(SSD1306_WHITE);
display.print(F("0x")); display.println(0xDEADBEEF, HEX);
*/

display.display();
delay(2000);
}

String espData(String command, const int timeout, boolean debug)
{
Serial.print("AT Command ==> ");
Serial.print(command);
Serial.println(" ");

String response = "";
espSerial.println(command);
long int time = millis();
while ( (time + timeout) > millis())
{
while (espSerial.available())
{
char c = espSerial.read();
response += c;
}
}
if (debug)
{
//Serial.print(response);
}
return response;
}