/* DS18B20 1-Wire digital temperature sensor with Arduino example code. More info: https://www.makerguides.com */
//  ESP32_18B20_2X_COMPARE_003  2x DS18B20 OK

// Include the required Arduino libraries:
#include "OneWire.h"
#include "DallasTemperature.h"

#include <Adafruit_SSD1306.h>
#include <Wire.h>
//#include <WiFi.h>
//#include <HTTPClient.h>
#include <ArduinoJson.h>
//#include "secrets.h" // WiFi Configuration (WiFi name and Password)
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

const char* ssid = "Wokwi-GUEST";
const char* password = "";

float Compare_4_5 = 0;
float tempC_4_Ven;
float tempC_5_Dilna;

// Define to which pin of the Arduino the 1-Wire bus is connected:
#define ONE_WIRE_BUS_4 4
#define ONE_WIRE_BUS_5 5
const int  Vent_ON  =  6; 
bool  LED_Vent = false;
bool  END_Vent = false;

//  ......................................................................................
unsigned long previousMillis = 0 ;
unsigned long currentMillis = 0 ;
const unsigned long interval_Zpozdi_ON = 1000;   // interval zpoždění ON a zobrazení na  OLED
int Time_ON = 10 ;

// Create a new instance of the oneWire class to communicate with any OneWire device:
OneWire oneWire_4(ONE_WIRE_BUS_4);
OneWire oneWire_5(ONE_WIRE_BUS_5);

// Pass the oneWire reference to DallasTemperature library:
DallasTemperature sensors_4(&oneWire_4);
DallasTemperature sensors_5(&oneWire_5);
//  ------------------------------------------------------------------------------------------------
//					      //////////     	            //
//				      //	     	                   //
//				     //		             /////      //
//			        //////////	   //   //    //////     //    //     /////
//				               //   ///////     //        //    //    //   //
//			                //	 //          //        //    //    //   //
//			     //////////      //////      //////    //////     ///////
//															                             //
// -------------------------------------------------------  //    ------------------------------------

void setup() {
  // Begin serial communication at a baud rate of 9600:
  Serial.begin(9600);
 pinMode(Vent_ON, OUTPUT);

    
  // Start up the library:
  sensors_4.begin();
  sensors_5.begin();

 if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;); // Don't proceed, loop forever
  }

  display.clearDisplay();
  display.setTextSize(1);           
  display.setTextColor(SSD1306_WHITE);      
  display.setCursor(0,0); 
  display.println("Init 0LED");
  display.display();
}
//  -------------------------------------------------------------------------------
//  Porovná teplotu sensor_4 a senzor_5
void Sensor_Compare()
{

Compare_4_5 = tempC_4_Ven - tempC_5_Dilna ;

if    (tempC_5_Dilna >=   tempC_4_Ven )   { LED_Vent = HIGH;  } 
      else { if ( END_Vent == true && Time_ON == 10 ) { LED_Vent = LOW; }}

    // set the LED with the ledState of the variable:
    digitalWrite( Vent_ON, LED_Vent);
}

//  -------------------------------------------------------------------------------
void Sensor_4_Ven()
{
sensors_4.requestTemperatures();

  // Fetch the temperature in degrees Celsius for device index:
   tempC_4_Ven = sensors_4.getTempCByIndex(0); // the index 0 refers to the first device
 
  // Print the temperature in Celsius in the Serial Monitor:
  Serial.print("Temperature 4: ");
  Serial.print(tempC_4_Ven);
  Serial.print(" \xC2\xB0"); // shows degree symbol
  Serial.print("C ");   Serial.print("     ");

}

//  ------------------------------------------------------------------------------
void Sensor_5_Dilna()
{
sensors_5.requestTemperatures();

  // Fetch the temperature in degrees Celsius for device index:
   tempC_5_Dilna = sensors_5.getTempCByIndex(0); // the index 0 refers to the first device
 
  // Print the temperature in Celsius in the Serial Monitor:
  Serial.print("Temperature 5: ");
  Serial.print(tempC_5_Dilna);
  Serial.print(" \xC2\xB0"); // shows degree symbol
  Serial.print("C ");  Serial.print("  ");
}

//  ------------------------------------------------------------------------------
void OLED_Teplota()
{
display.clearDisplay();       
  display.setTextColor(SSD1306_WHITE);      
  display.setCursor(0,0); 
  display.setTextSize(3);    
 display.print(tempC_5_Dilna,1);  
 display.setTextSize(1);   
 display.print(" Dilna");  
 
 display.setCursor(0,29); 
 display.setTextSize(3);    
 display.print(tempC_4_Ven,1);  
 display.setTextSize(1);    
 display.print(" Ven");  

 if  (LED_Vent == LOW)
  {
 display.setCursor(0,55); display.print("Ventilace ");  display.print(Time_ON); display.print(" "); display.print(END_Vent);
  }
    else  {display.setCursor(0,55); display.print("Time_ON: "); display.print(Time_ON); display.print(" "); display.print(END_Vent); }

 display.display();
}



//  ---------------------------------------------------------------------------------------
//             	 //
//  				    //				    Hlavní smyčka
//  			     //
//  				  //         //////     //////     //////
//  				 //        //    //   //    //   //    //
//  				//        //    //   //    //   //    //
//  			 /////////  //////     //////    ///////
//  											                //
// ------------------------------------  //    ------------------------------------

void loop() {
  // Send the command for all devices on the bus to perform a temperature conversion:
  Sensor_4_Ven() ;
  delay(1000);
  Sensor_5_Dilna() ;

  // Wait 1 second:
  delay(1000);

  Sensor_Compare() ;
   Serial.println(Compare_4_5);
   Serial.println("");
   OLED_Teplota();



//  načti teplotu pro zobrazení na OLED
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval_Zpozdi_ON)
  {
    previousMillis = currentMillis;
    if (LED_Vent == HIGH && Time_ON > 0 ) {Time_ON = Time_ON - 1 ; }
    Serial.print("Time ON: ");  Serial.println(Time_ON);
    if ( Time_ON == 0  &&  LED_Vent == HIGH) { END_Vent = true ;  Time_ON = 10; }
   
  }

//  ----------------------------------------------------------------------------------------









}