Dallas DS18B20 immer 0°C bzw. 32°F

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Mit folgenden Sketches bekomme ich diese Ausgabe (nur wenn ich das MOSI Kaber am Arduino nicht angeschlossen habe):

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Uno:

#include <SPI.h>
#include "nRF24L01.h"
#include "RF24.h"
#include "printf.h"

// Hardware configuration: Set up nRF24L01 radio on SPI bus plus pins 9 & 10 
RF24 radio(7,8);

byte addresses[][6] = {"1Node","2Node"};


// Set up roles to simplify testing 
boolean role;                                    // The main role variable, holds the current role identifier
boolean recieve = 1, senden = 0;   // The two different roles.

void setup() {


  Serial.begin(250000);
  printf_begin();

  // Setup and configure rf radio
  radio.begin();                          // Start up the radio
  radio.setAutoAck(1);                    // Ensure autoACK is enabled
  radio.openReadingPipe(1,addresses[1]);
  
  radio.startListening();                 // Start listening
 }

void loop(void){
      if( radio.available()){
      unsigned long got_tempout;                                       // Variable for the received timestamp
      while (radio.available()) {                                   // While there is data ready
        radio.read( &got_tempout, sizeof(unsigned long) );             // Get the payload
      }      
      printf(got_tempout);  
   }
 }

Tiny:

#include <SPI85.h>
#include "nRF24L01.h"
#include "RF24.h"
//#include <OneWire.h>
//#include <DallasTemperature.h>

#define CE_PIN 7
#define CSN_PIN 3
RF24 radio(CE_PIN, CSN_PIN);

byte addresses[][6] = {"1Node", "2Node"};
boolean role;                                   
boolean recieve = 1, senden = 0;

//#define ONE_WIRE_BUS 9
//OneWire oneWire(ONE_WIRE_BUS);
//DallasTemperature sensors(&oneWire);

void setup() {


  //sensors.begin();
  //sensors.setResolution(9);
  // Setup and configure rf radio
  radio.begin();                          
  radio.setAutoAck(1);
  radio.openWritingPipe(addresses[0]);
}

void loop(void) {
  //sensors.requestTemperaturesByIndex(0);
  //float tempout = sensors.getTempCByIndex(0);
  float tempout = 14.25;
  radio.write( &tempout, sizeof(tempout) );
}

Also leider nichts schlaues. Kennt ihr dieses Problem?