DS18B20 - ADRESS not found

Hello,

I have arduino Uno, LCD display and senzor DS18B20 on board with RLC and transistor element. I need read Adress senzors and print on LCD.
To list the addresses you need to adjust the time for the transfer, I triedsensors.setCheckForConversion(false); but dosnt work. When connecting ordinary sensor reading works.

#include <OneWire.h>                  // Knihovny
#include <DallasTemperature.h>
#include <LiquidCrystal.h>

#define ONE_WIRE_BUS 8
#define DS18B20 8

OneWire ourWire(DS18B20);
DallasTemperature sensors(&ourWire);


OneWire  ds(8);                       // Přiřazení PINu DS18B(S)20
LiquidCrystal lcd(12, 11, 10, 5, 4, 3, 2);    // Vytvoření objektu LCD



int backLight = 13;                   // PIN na osvětlení dipleje
//OneWire oneWire(ONE_WIRE_BUS);
//DallasTemperature sensors(&oneWire);

void setup(void)
  {
   Serial.begin(9600);
   Serial.println("CLEARDATA");
   Serial.println("LABEL,Adress");
   
  }
  
void loop(void)
  {
     
 // Serial.println(" ");
   Serial.println(" ");
   Serial.println("LABEL,Adress");
 // Serial.println(" ");
    Serial.print("DATA,TIME,");
    
 // Serial.print("Adress: ");
 // Serial.print("Data2");

  lcd.begin(16, 2);                   // Parametry počet sloupů a řádků
  lcd.clear();                        // Smazání znaků na displeji
  lcd.setCursor(0,0);                 // Nastavení kurzoru na pozici (s, ř)
  getDeviceAddress();                 // Získání adresy
  pinMode(backLight, OUTPUT);         // Osvětlení displeje 
  analogWrite(backLight, 128);        // Osvětlení displeje
  
  sensors.begin();  
  sensors.setCheckForConversion(false); 

  
  sensors.requestTemperatures();
  lcd.setCursor(0,0);                 // Nastavení cursoru
  float tempC(sensors.getTempCByIndex(0));
  if (tempC == -127.00) {
    lcd.clear();
    lcd.home();
  lcd.print("PripojCidlo");
  } 
  else {
  lcd.print(tempC);
  }
  lcd.setCursor(6,0);
  lcd.print("C");
  delay (3000);
 
}  
  void getDeviceAddress(void) {
  byte i;
  byte addr[8];

//  sensors.begin();                      // Začátek komunikace se senzorem

    while(ds.search(addr))      {
   
    if(addr[0] == 0x28) {
    lcd.setCursor(9,0);
    lcd.print("DS18B20"); }
    else if(addr[0] == 0x10) {
    lcd.setCursor(9,0);
    lcd.print("DS18S20");}
   lcd.setCursor(0, 1);
    for( i = 0; i < 8; i++) {
      

     if (addr[i] < 16) {
      
    Serial.print('0');
   
    lcd.print('0');
                       }
  //  lcd.setCursor(0, 1);
    lcd.print(addr[i], HEX);
    Serial.print(addr[i], HEX);
     if (i < 7) {
  //  lcd.print(",");
    lcd.leftToRight();
      }
    }
  
    if ( OneWire::crc8( addr, 7) != addr[7]) {
    
     //   lcd.setCursor(0, 1);
        lcd.print("Neni hodnota");
        return;
    }
  }
  ds.reset_search();
  return;
}

Need I modify library???

You have declared two instances of OneWire for the same pin, pin 8.

Yes, I know...but the functionality is not affected I think. On display write program - 0.00 C.

So you've read the code of the OneWire and DallasTemperature libraries and proved to yourself
it doesn't cause a problem - if not, play safe. Eliminate all possible problems until you home in
on the genuine problem.

Go back to a working example, make one change at a time, otherwise its easy to get lost as to
what is happening (do you have oscilloscope?)

Yes, I have a oscilloscope ... the problem is probably here:
From Datasheet:

In some situations the bus master may not know whether
the DS18B20s on the bus are parasite powered or powered by external supplies. The master needs this information to determine if the strong bus pullup should be used
during temperature conversions. To get this information,
the master can issue a Skip ROM [CCh] command followed by a Read Power Supply [B4h] command followed
by a “read time slot”. During the read time slot, parasite
powered DS18B20s will pull the bus low, and externally
powered DS18B20s will let the bus remain high. If the
bus is pulled low, the master knows that it must supply
the strong pullup on the 1-Wire bus during temperature
conversions.

You do not know how to edit a library that she could read the value?

Are you using parasite power? Its harder to get working, avoid if you can, normal mode works
well, I've never tried parasite power, and those that have often have issues.

Yes, I use paraiste power (Vdd unite GND). Unfortunately, I do not have the option to use normal mode power.

On display is: "ovf" only.

Doesn't matter, first get normal mode working, then when you move to parasite power you'll
any further issues are to do with that mode, not the basic logic...