diff --git a/CAD/Datasheet/MAX31855.pdf b/CAD/Datasheet/MAX31855.pdf
new file mode 100644
index 0000000..2ef87d3
Binary files /dev/null and b/CAD/Datasheet/MAX31855.pdf differ
diff --git a/reflow_plate_fw/platformio.ini b/reflow_plate_fw/platformio.ini
index 0c7f493..a9eb38c 100644
--- a/reflow_plate_fw/platformio.ini
+++ b/reflow_plate_fw/platformio.ini
@@ -18,8 +18,7 @@ monitor_speed = 115200
 lib_deps = 
 	bodmer/TFT_eSPI@^2.3.70
 	br3ttb/PID@^1.2.1
-	;siruli/MAX6675@^2.1.0
-	zhenek-kreker/MAX6675 with hardware SPI@^1.0.0
+	robtillaart/MAX31855@^0.2.5
 lib_ldf_mode = deep+
 build_flags = 
 	-D USER_SETUP_LOADED=1
diff --git a/reflow_plate_fw/src/board.h b/reflow_plate_fw/src/board.h
index 72dfa56..d25b4dc 100644
--- a/reflow_plate_fw/src/board.h
+++ b/reflow_plate_fw/src/board.h
@@ -8,8 +8,8 @@
 // #define LCD_CS        PB0
 
 #define THERM_SS        PB12
-#define THERM_MISO      PB13
-#define THERM_CLK       PB14
+#define THERM_MISO      PB14
+#define THERM_CLK       PB13
 #define THERM_MOSI      PB15 //not used
 
 
diff --git a/reflow_plate_fw/src/lcd.cpp b/reflow_plate_fw/src/lcd.cpp
index 73e5579..6fab460 100644
--- a/reflow_plate_fw/src/lcd.cpp
+++ b/reflow_plate_fw/src/lcd.cpp
@@ -59,7 +59,7 @@ uint32_t calcTime(uint32_t timeMs)
   return map((timeMs / 1000), 0, CHART_TIME_MAX, 0, CHART_W - CHART_Y_AXIS_OFFSET);
 }
 
-std::vector<double> temperatureReading;
+std::vector<float> temperatureReading;
 uint32_t lastReading = 0;
 #define TEMPINTERVAL 1000
 
diff --git a/reflow_plate_fw/src/thermo.cpp b/reflow_plate_fw/src/thermo.cpp
index bb6eb03..c87bb55 100644
--- a/reflow_plate_fw/src/thermo.cpp
+++ b/reflow_plate_fw/src/thermo.cpp
@@ -1,40 +1,48 @@
 #include "thermo.h"
 #include "controlloop.h"
 
-MAX6675 thermocouple(THERM_SS, THERM_MISO, THERM_CLK);
+//MAX6675 thermocouple(THERM_SS, THERM_MISO, THERM_CLK);
+MAX31855 thermocouple(THERM_CLK, THERM_SS, THERM_MISO); //uint8_t CS, uint8_t MISO);
+
+// initialize the Thermocouple
+//Adafruit_MAX31855 thermocouple(THERM_CLK, THERM_SS, THERM_MISO);
 
 uint32_t thermo_lastTime = 0;
 
-double lastTemperature = 0;
+float lastTemperature = 0;
+float internal = 0;
 
-bool simulation = true;
+bool simulation = false;
 #define SIM_TEMP_STEP 1
 #define SIM_TEMP_COOL 0.08
 #define SIM_INTERVAL 100
 uint32_t simTimer = 0;
+uint32_t sampleTimer = 0;
 
 void initThermo()
 {
-  if(simulation)
+  thermocouple.begin();
+  if (simulation)
   {
-    lastTemperature = TEMPERATURE_ROOM-20;
+    lastTemperature = TEMPERATURE_ROOM - 20;
   }
 }
 
 void handleThermo(void)
 {
-  if(simulation)
+  uint32_t timeNow = millis();
+  if (simulation)
   {
-    uint32_t timeNow = millis();
-    if(timeNow - simTimer > SIM_INTERVAL)
+
+    if (timeNow - simTimer > SIM_INTERVAL)
     {
-      if(getOutputState())
+      if (getOutputState())
       {
         lastTemperature += SIM_TEMP_STEP;
       }
       else
       {
-        if(lastTemperature > TEMPERATURE_ROOM-20)
+        if (lastTemperature > TEMPERATURE_ROOM - 20)
         {
           lastTemperature -= SIM_TEMP_COOL;
         }
@@ -44,33 +52,22 @@ void handleThermo(void)
   }
   else
   {
-      lastTemperature = thermocouple.readTempC();
-
+    if (timeNow - sampleTimer > THERMO_INTERVAL)
+    {
+      int state = thermocouple.read();
+      lastTemperature = thermocouple.getTemperature();
+      internal = thermocouple.getInternal();
+      sampleTimer = timeNow;
+    }
   }
 }
 
-double getTemperature(void)
+float getTemperature(void)
 {
   return lastTemperature; //lastTemperature;
 }
 
 bool getThermoCoupleFault(void)
 {
-#ifdef MAX31856
-  uint8_t fault = thermocouple.readFault();
-  if (fault)
-  {
-    if (fault & MAX6675_FAULT_CJRANGE)             //Serial.println("Cold Junction Range Fault");
-      if (fault & MAX31856_FAULT_TCRANGE)          //Serial.println("Thermocouple Range Fault");
-        if (fault & MAX31856_FAULT_CJHIGH)         //Serial.println("Cold Junction High Fault");
-          if (fault & MAX31856_FAULT_CJLOW)        //Serial.println("Cold Junction Low Fault");
-            if (fault & MAX31856_FAULT_TCHIGH)     //Serial.println("Thermocouple High Fault");
-              if (fault & MAX31856_FAULT_TCLOW)    //Serial.println("Thermocouple Low Fault");
-                if (fault & MAX31856_FAULT_OVUV)   //Serial.println("Over/Under Voltage Fault");
-                  if (fault & MAX31856_FAULT_OPEN) //Serial.println("Thermocouple Open Fault");
-                    return true;
-  }
-#else
-  return false;
-#endif
+  return thermocouple.genericError();
 }
diff --git a/reflow_plate_fw/src/thermo.h b/reflow_plate_fw/src/thermo.h
index e4197c2..095ed27 100644
--- a/reflow_plate_fw/src/thermo.h
+++ b/reflow_plate_fw/src/thermo.h
@@ -3,13 +3,14 @@
 #include "Arduino.h"
 #include "board.h"
 
-#include "max6675.h"
+//#include "max6675.h"
+#include "MAX31855.h"
 
 #define THERMO_INTERVAL 200
 #define SMOOTHING_FACTOR 2
 
 void initThermo(void);
 void handleThermo(void);
-double getTemperature(void);
+float getTemperature(void);
 bool getThermoCoupleFault(void);