#include <DHT.h>
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include "ThingSpeak.h"


#define DHT_pin 5
#define Cervena_led 17
#define Modra_led 16


#define BarGrafMin 10  //minimálna teplota
#define BarGrafMax 30 //maximálna teplota
#define stlpce 16
#define riadky 2


DHT Teplomer = DHT(DHT_pin,DHT22);
LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27,stlpce,riadky);


bool aktualizacia_lcd = true;
bool aktualizacia_Thing_Speak = false;
bool posielanie = false;
float teplota;
unsigned long cas;
unsigned long casovanie_thing_speak;
const int interval = 1000;

const char* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";
const int myChannelNumber = 2889651;
const char* myApiKey = "THAO8MO5QEW1N92J"; //sem vlož vlastny kanal – write API key
const char* server = "api.thingspeak.com";
WiFiClient client;


void setup() 
{
  lcd.init();
  lcd.backlight();

  Serial.begin(115200);
  WiFi.begin(WIFI_NAME, WIFI_PASSWORD, 6);

  while(WiFi.status() != WL_CONNECTED)
  {
    delay(1000);
    Serial.println("Wifi not connected");
  }

  Serial.println("Wifi connected !");
  Serial.println("Local IP: " + String(WiFi.localIP()));
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);

  pinMode(Cervena_led, OUTPUT);
  pinMode(Modra_led, OUTPUT);

  digitalWrite(Cervena_led, LOW);
  digitalWrite(Modra_led, LOW);
}


void loop() 
{
  if(aktualizacia_lcd)
  {
    //nacitanie zo senzora
    teplota = Teplomer.readTemperature();

    //vypisanie na lcd
    lcd.clear();
    lcd.print("T = ");
    lcd.print(teplota,1);
    lcd.print(" C");

    if(posielanie)
    {
      lcd.setCursor(14,0);
      lcd.print("A");
    }

    lcd.setCursor(0,1);
    float nieco = ((teplota - BarGrafMin)/((BarGrafMax - BarGrafMin)/stlpce));
    for(byte i = 0; i < stlpce; i++)
      if(i < nieco)
        lcd.print("]");
      else
        lcd.print(" ");

    aktualizacia_lcd = false;
  }

  if(millis() > (cas + interval))
  {
    aktualizacia_lcd = true;
    cas += interval;
  }

  if(aktualizacia_Thing_Speak)
  {
    ThingSpeak.setField(1,teplota);
    ThingSpeak.setField(2,digitalRead(Cervena_led));

    int x = ThingSpeak.writeFields(myChannelNumber,myApiKey);

    if(x == 200)
    {
      Serial.println("Odoslanie dat uspesne");
    }
    else 
    {
      Serial.println("Chyba pri odosielani" + String(x));
    }
    Serial.println("---");

    aktualizacia_Thing_Speak = false;
  }

  if(millis() > (casovanie_thing_speak + 20000))
  {
    aktualizacia_Thing_Speak = true;
    casovanie_thing_speak += 20000;
    posielanie = true;
  }

  if((millis() > (casovanie_thing_speak + 5000)) && posielanie)
    posielanie = false;

  if(teplota < BarGrafMin)
    digitalWrite(Cervena_led, HIGH);

  if(teplota > BarGrafMax)
    digitalWrite(Modra_led, HIGH);

  if((teplota > BarGrafMin) && (teplota < BarGrafMax))
  {
    digitalWrite(Cervena_led, LOW);
    digitalWrite(Modra_led, LOW);
  }
}