#include "Adafruit_MAX31855.h"
int thermoDO = 3;
int thermoCS = 4;
int thermoCLK = 5;
Adafruit_MAX31855 thermocouple(thermoCLK, thermoCS, thermoDO);
:): check your CLK and D0 connections..........pin numbers look reversed, either h/w or code, probably is of little consequence.