esp8266 und DS18B20

Hallo zusammen
Habe den mehre DS18BS20 an den ESP8266 angeschlossen und das Programm unten laufen.
Mein Probelm ist jetzt: Es werden nicht alle DS18B20 erkannt.
Frage: kann ich den Wiederstand jetzt 4.7 KOhme veränderen. In welchen bereich?
Und erreiche ich damit was?

Code:

---

#include <OneWire.h>
#include <DallasTemperature.h>

// Data wire is plugged TO GPIO 4
#define ONE_WIRE_BUS 4

// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);

// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);

// Number of temperature devices found
int numberOfDevices;

// We'll use this variable to store a found device address
DeviceAddress tempDeviceAddress;

void setup() {
  // start serial port
  Serial.begin(115200);
  Serial.println();

  // Start up the library
  sensors.begin();

  // Grab a count of devices on the wire
  numberOfDevices =  sensors.getDeviceCount(), DEC;

  // locate devices on the bus
  Serial.print("Locating devices...");
  Serial.print("Found ");
  Serial.print(numberOfDevices, DEC);
  Serial.println(" devices.");

  // Loop through each device, print out address
  for (int i = 0; i < numberOfDevices; i++) {
    // Search the wire for address
    if (sensors.getAddress(tempDeviceAddress, i)) {
      Serial.print("Found device ");
      Serial.print(i, DEC);
      Serial.print(" with address: ");
      printAddress(tempDeviceAddress);
      Serial.println();
    } else {
      Serial.print("Found ghost device at ");
      Serial.print(i, DEC);
      Serial.print(" but could not detect address. Check power and cabling");
    }
  }
}

void loop() {
  sensors.requestTemperatures(); // Send the command to get temperatures

  // Loop through each device, print out temperature data
  for (int i = 0; i < numberOfDevices; i++) {
    // Search the wire for address
    if (sensors.getAddress(tempDeviceAddress, i)) {
      // Output the device ID
      Serial.print("Temperature for device: ");
      Serial.println(i, DEC);
      // Print the data
      float tempC = sensors.getTempC(tempDeviceAddress);
      Serial.print("Temp C: ");
      Serial.print(tempC);
      Serial.print(" Temp F: ");
      Serial.println(DallasTemperature::toFahrenheit(tempC)); // Converts tempC to Fahrenheit
    }
  }
  delay(5000);
}

// function to print a device address
void printAddress(DeviceAddress deviceAddress) {
  for (uint8_t i = 0; i < 8; i++) {
    if (deviceAddress[i] < 16) Serial.print("0");
    Serial.print(deviceAddress[i], HEX);
  }
}

---