Problem beim Auslesen eines MAX31855K

/*************************************************** 

  This is an example for the Adafruit Thermocouple Sensor w/MAX31855K

  Designed specifically to work with the Adafruit Thermocouple Sensor

  ----> https://www.adafruit.com/products/269

  These displays use SPI to communicate, 3 pins are required to  

  interface

  Adafruit invests time and resources providing this open source code, 

  please support Adafruit and open-source hardware by purchasing 

  products from Adafruit!

  Written by Limor Fried/Ladyada for Adafruit Industries.  

  BSD license, all text above must be included in any redistribution

 ****************************************************/

#include <SPI.h>

#include "Adafruit_MAX31855.h"

// Default connection is using software SPI, but comment and uncomment one of

// the two examples below to switch between software SPI and hardware SPI:

// Example creating a thermocouple instance with software SPI on any three

// digital IO pins.

#define MAXDO   3

#define MAXCS   4

#define MAXCLK  5

// initialize the Thermocouple

Adafruit_MAX31855 thermocouple(MAXCLK, MAXCS, MAXDO);

// Example creating a thermocouple instance with hardware SPI

// on a given CS pin.

//#define MAXCS   10

//Adafruit_MAX31855 thermocouple(MAXCS);

void setup() {

  while (!Serial); // wait for Serial on Leonardo/Zero, etc

  Serial.begin(9600);

  Serial.println("MAX31855 test");

  // wait for MAX chip to stabilize

  delay(500);

}

void loop() {

  // basic readout test, just print the current temp

   Serial.print("Internal Temp = ");

   Serial.println(thermocouple.readInternal());

   double c = thermocouple.readCelsius();

   if (isnan(c)) {

     Serial.println("Something wrong with thermocouple!");

   } else {

     Serial.print("C = "); 

     Serial.println(c);

   }

   //Serial.print("F = ");

   //Serial.println(thermocouple.readFarenheit());

   delay(1000);

}