diff --git a/sonoff/i18n.h b/sonoff/i18n.h
index 2347cba22..a4de6d1bd 100644
--- a/sonoff/i18n.h
+++ b/sonoff/i18n.h
@@ -106,8 +106,10 @@
 #define D_JSON_PRESSURE "Pressure"
 #define D_JSON_PRESSUREATSEALEVEL "SeaPressure"
 #define D_JSON_PRESSURE_UNIT "PressureUnit"
+#define D_JSON_PROBETEMPERATURE "ProbeTemperature"
 #define D_JSON_PROGRAMFLASHSIZE "ProgramFlashSize"
 #define D_JSON_PROGRAMSIZE "ProgramSize"
+#define D_JSON_REFERENCETEMPERATURE "ReferenceTemperature"
 #define D_JSON_RESET "Reset"
 #define D_JSON_RESTARTING "Restarting"
 #define D_JSON_RESTARTREASON "RestartReason"
diff --git a/sonoff/language/bg-BG.h b/sonoff/language/bg-BG.h
index 222c62b58..cf899685f 100644
--- a/sonoff/language/bg-BG.h
+++ b/sonoff/language/bg-BG.h
@@ -540,6 +540,9 @@
 #define D_SENSOR_RF_SENSOR "RF датчик"
 #define D_SENSOR_AZ_RX   "AZ Rx"
 #define D_SENSOR_AZ_TX   "AZ Tx"
+#define D_SENSOR_MAX31855_CS  "MAX31855 CS"
+#define D_SENSOR_MAX31855_CLK "MAX31855 CLK"
+#define D_SENSOR_MAX31855_DO  "MAX31855 DO"
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/sonoff/language/cs-CZ.h b/sonoff/language/cs-CZ.h
index 45f55af6a..21366053b 100644
--- a/sonoff/language/cs-CZ.h
+++ b/sonoff/language/cs-CZ.h
@@ -540,6 +540,9 @@
 #define D_SENSOR_RF_SENSOR "RF Sensor"
 #define D_SENSOR_AZ_RX   "AZ Rx"
 #define D_SENSOR_AZ_TX   "AZ Tx"
+#define D_SENSOR_MAX31855_CS  "MAX31855 CS"
+#define D_SENSOR_MAX31855_CLK "MAX31855 CLK"
+#define D_SENSOR_MAX31855_DO  "MAX31855 DO"
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/sonoff/language/de-DE.h b/sonoff/language/de-DE.h
index 23d8de9ed..80ea03d1e 100644
--- a/sonoff/language/de-DE.h
+++ b/sonoff/language/de-DE.h
@@ -540,6 +540,9 @@
 #define D_SENSOR_RF_SENSOR "RF Sensor"
 #define D_SENSOR_AZ_RX   "AZ Rx"
 #define D_SENSOR_AZ_TX   "AZ Tx"
+#define D_SENSOR_MAX31855_CS  "MAX31855 CS"
+#define D_SENSOR_MAX31855_CLK "MAX31855 CLK"
+#define D_SENSOR_MAX31855_DO  "MAX31855 DO"
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/sonoff/language/el-GR.h b/sonoff/language/el-GR.h
index a8b48ed35..b36efe3b4 100644
--- a/sonoff/language/el-GR.h
+++ b/sonoff/language/el-GR.h
@@ -540,6 +540,9 @@
 #define D_SENSOR_RF_SENSOR "RF Sensor"
 #define D_SENSOR_AZ_RX   "AZ Rx"
 #define D_SENSOR_AZ_TX   "AZ Tx"
+#define D_SENSOR_MAX31855_CS  "MAX31855 CS"
+#define D_SENSOR_MAX31855_CLK "MAX31855 CLK"
+#define D_SENSOR_MAX31855_DO  "MAX31855 DO"
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/sonoff/language/en-GB.h b/sonoff/language/en-GB.h
index 2ea9c249a..20b4f8ddb 100644
--- a/sonoff/language/en-GB.h
+++ b/sonoff/language/en-GB.h
@@ -540,6 +540,9 @@
 #define D_SENSOR_RF_SENSOR "RF Sensor"
 #define D_SENSOR_AZ_RX   "AZ Rx"
 #define D_SENSOR_AZ_TX   "AZ Tx"
+#define D_SENSOR_MAX31855_CS  "MAX31855 CS"
+#define D_SENSOR_MAX31855_CLK "MAX31855 CLK"
+#define D_SENSOR_MAX31855_DO  "MAX31855 DO"
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/sonoff/language/es-AR.h b/sonoff/language/es-AR.h
index fc50b9d6f..dbf69404f 100644
--- a/sonoff/language/es-AR.h
+++ b/sonoff/language/es-AR.h
@@ -540,6 +540,9 @@
 #define D_SENSOR_RF_SENSOR "RF Sensor"
 #define D_SENSOR_AZ_RX   "AZ Rx"
 #define D_SENSOR_AZ_TX   "AZ Tx"
+#define D_SENSOR_MAX31855_CS  "MAX31855 CS"
+#define D_SENSOR_MAX31855_CLK "MAX31855 CLK"
+#define D_SENSOR_MAX31855_DO  "MAX31855 DO"
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/sonoff/language/fr-FR.h b/sonoff/language/fr-FR.h
index 0638b408a..1a3cfae5f 100644
--- a/sonoff/language/fr-FR.h
+++ b/sonoff/language/fr-FR.h
@@ -540,6 +540,9 @@
 #define D_SENSOR_RF_SENSOR "RF Sensor"
 #define D_SENSOR_AZ_RX   "AZ Rx"
 #define D_SENSOR_AZ_TX   "AZ Tx"
+#define D_SENSOR_MAX31855_CS  "MAX31855 CS"
+#define D_SENSOR_MAX31855_CLK "MAX31855 CLK"
+#define D_SENSOR_MAX31855_DO  "MAX31855 DO"
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/sonoff/language/he-HE.h b/sonoff/language/he-HE.h
index cd1b0e92e..cbfacad14 100644
--- a/sonoff/language/he-HE.h
+++ b/sonoff/language/he-HE.h
@@ -540,6 +540,9 @@
 #define D_SENSOR_RF_SENSOR "RF Sensor"
 #define D_SENSOR_AZ_RX   "AZ Rx"
 #define D_SENSOR_AZ_TX   "AZ Tx"
+#define D_SENSOR_MAX31855_CS  "MAX31855 CS"
+#define D_SENSOR_MAX31855_CLK "MAX31855 CLK"
+#define D_SENSOR_MAX31855_DO  "MAX31855 DO"
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/sonoff/language/hu-HU.h b/sonoff/language/hu-HU.h
index 244d55776..ea2f65ea0 100644
--- a/sonoff/language/hu-HU.h
+++ b/sonoff/language/hu-HU.h
@@ -540,6 +540,9 @@
 #define D_SENSOR_RF_SENSOR "RF Sensor"
 #define D_SENSOR_AZ_RX   "AZ Rx"
 #define D_SENSOR_AZ_TX   "AZ Tx"
+#define D_SENSOR_MAX31855_CS  "MAX31855 CS"
+#define D_SENSOR_MAX31855_CLK "MAX31855 CLK"
+#define D_SENSOR_MAX31855_DO  "MAX31855 DO"
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/sonoff/language/it-IT.h b/sonoff/language/it-IT.h
index a6d0d693c..b497ef04b 100644
--- a/sonoff/language/it-IT.h
+++ b/sonoff/language/it-IT.h
@@ -540,6 +540,9 @@
 #define D_SENSOR_RF_SENSOR "RF Sensor"
 #define D_SENSOR_AZ_RX   "AZ Rx"
 #define D_SENSOR_AZ_TX   "AZ Tx"
+#define D_SENSOR_MAX31855_CS  "MAX31855 CS"
+#define D_SENSOR_MAX31855_CLK "MAX31855 CLK"
+#define D_SENSOR_MAX31855_DO  "MAX31855 DO"
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/sonoff/language/nl-NL.h b/sonoff/language/nl-NL.h
index b3bf10989..df9d4dcb1 100644
--- a/sonoff/language/nl-NL.h
+++ b/sonoff/language/nl-NL.h
@@ -540,6 +540,9 @@
 #define D_SENSOR_RF_SENSOR "RF Sensor"
 #define D_SENSOR_AZ_RX   "AZ Rx"
 #define D_SENSOR_AZ_TX   "AZ Tx"
+#define D_SENSOR_MAX31855_CS  "MAX31855 CS"
+#define D_SENSOR_MAX31855_CLK "MAX31855 CLK"
+#define D_SENSOR_MAX31855_DO  "MAX31855 DO"
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/sonoff/language/pl-PL.h b/sonoff/language/pl-PL.h
index d80826751..7a42aff61 100644
--- a/sonoff/language/pl-PL.h
+++ b/sonoff/language/pl-PL.h
@@ -540,6 +540,9 @@
 #define D_SENSOR_RF_SENSOR "RF Sensor"
 #define D_SENSOR_AZ_RX   "AZ Rx"
 #define D_SENSOR_AZ_TX   "AZ Tx"
+#define D_SENSOR_MAX31855_CS  "MAX31855 CS"
+#define D_SENSOR_MAX31855_CLK "MAX31855 CLK"
+#define D_SENSOR_MAX31855_DO  "MAX31855 DO"
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/sonoff/language/pt-BR.h b/sonoff/language/pt-BR.h
index 7add978f0..c62816af8 100644
--- a/sonoff/language/pt-BR.h
+++ b/sonoff/language/pt-BR.h
@@ -540,6 +540,9 @@
 #define D_SENSOR_RF_SENSOR "RF Sensor"
 #define D_SENSOR_AZ_RX   "AZ Rx"
 #define D_SENSOR_AZ_TX   "AZ Tx"
+#define D_SENSOR_MAX31855_CS  "MAX31855 CS"
+#define D_SENSOR_MAX31855_CLK "MAX31855 CLK"
+#define D_SENSOR_MAX31855_DO  "MAX31855 DO"
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/sonoff/language/pt-PT.h b/sonoff/language/pt-PT.h
index 9869762b8..5e2b13255 100644
--- a/sonoff/language/pt-PT.h
+++ b/sonoff/language/pt-PT.h
@@ -540,6 +540,9 @@
 #define D_SENSOR_RF_SENSOR "RF Sensor"
 #define D_SENSOR_AZ_RX   "AZ Rx"
 #define D_SENSOR_AZ_TX   "AZ Tx"
+#define D_SENSOR_MAX31855_CS  "MAX31855 CS"
+#define D_SENSOR_MAX31855_CLK "MAX31855 CLK"
+#define D_SENSOR_MAX31855_DO  "MAX31855 DO"
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/sonoff/language/ru-RU.h b/sonoff/language/ru-RU.h
index d0a3f6933..ef8aaccef 100644
--- a/sonoff/language/ru-RU.h
+++ b/sonoff/language/ru-RU.h
@@ -540,6 +540,9 @@
 #define D_SENSOR_RF_SENSOR "RF Sensor"
 #define D_SENSOR_AZ_RX   "AZ Rx"
 #define D_SENSOR_AZ_TX   "AZ Tx"
+#define D_SENSOR_MAX31855_CS  "MAX31855 CS"
+#define D_SENSOR_MAX31855_CLK "MAX31855 CLK"
+#define D_SENSOR_MAX31855_DO  "MAX31855 DO"
 
 // Units
 #define D_UNIT_AMPERE "А"
diff --git a/sonoff/language/sk-SK.h b/sonoff/language/sk-SK.h
index f46372426..16da51d32 100644
--- a/sonoff/language/sk-SK.h
+++ b/sonoff/language/sk-SK.h
@@ -540,6 +540,9 @@
 #define D_SENSOR_RF_SENSOR "RF Senzor"
 #define D_SENSOR_AZ_RX   "AZ Rx"
 #define D_SENSOR_AZ_TX   "AZ Tx"
+#define D_SENSOR_MAX31855_CS  "MAX31855 CS"
+#define D_SENSOR_MAX31855_CLK "MAX31855 CLK"
+#define D_SENSOR_MAX31855_DO  "MAX31855 DO"
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/sonoff/language/sv-SE.h b/sonoff/language/sv-SE.h
index f36162a4b..7f1b4ba5a 100644
--- a/sonoff/language/sv-SE.h
+++ b/sonoff/language/sv-SE.h
@@ -540,6 +540,9 @@
 #define D_SENSOR_RF_SENSOR "RF Sensor"
 #define D_SENSOR_AZ_RX   "AZ Rx"
 #define D_SENSOR_AZ_TX   "AZ Tx"
+#define D_SENSOR_MAX31855_CS  "MAX31855 CS"
+#define D_SENSOR_MAX31855_CLK "MAX31855 CLK"
+#define D_SENSOR_MAX31855_DO  "MAX31855 DO"
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/sonoff/language/tr-TR.h b/sonoff/language/tr-TR.h
index 06d82b9cb..4ff68c52f 100755
--- a/sonoff/language/tr-TR.h
+++ b/sonoff/language/tr-TR.h
@@ -540,6 +540,9 @@
 #define D_SENSOR_RF_SENSOR "RF Sensor"
 #define D_SENSOR_AZ_RX   "AZ Rx"
 #define D_SENSOR_AZ_TX   "AZ Tx"
+#define D_SENSOR_MAX31855_CS  "MAX31855 CS"
+#define D_SENSOR_MAX31855_CLK "MAX31855 CLK"
+#define D_SENSOR_MAX31855_DO  "MAX31855 DO"
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/sonoff/language/uk-UK.h b/sonoff/language/uk-UK.h
index 509c90753..5043c857c 100644
--- a/sonoff/language/uk-UK.h
+++ b/sonoff/language/uk-UK.h
@@ -540,6 +540,9 @@
 #define D_SENSOR_RF_SENSOR "RF Sensor"
 #define D_SENSOR_AZ_RX   "AZ Rx"
 #define D_SENSOR_AZ_TX   "AZ Tx"
+#define D_SENSOR_MAX31855_CS  "MAX31855 CS"
+#define D_SENSOR_MAX31855_CLK "MAX31855 CLK"
+#define D_SENSOR_MAX31855_DO  "MAX31855 DO"
 
 // Units
 #define D_UNIT_AMPERE "А"
diff --git a/sonoff/language/zh-CN.h b/sonoff/language/zh-CN.h
index 05bedca81..858d45186 100644
--- a/sonoff/language/zh-CN.h
+++ b/sonoff/language/zh-CN.h
@@ -540,6 +540,9 @@
 #define D_SENSOR_RF_SENSOR "RF Sensor"
 #define D_SENSOR_AZ_RX   "AZ Rx"
 #define D_SENSOR_AZ_TX   "AZ Tx"
+#define D_SENSOR_MAX31855_CS  "MAX31855 CS"
+#define D_SENSOR_MAX31855_CLK "MAX31855 CLK"
+#define D_SENSOR_MAX31855_DO  "MAX31855 DO"
 
 // Units
 #define D_UNIT_AMPERE "安"
diff --git a/sonoff/language/zh-TW.h b/sonoff/language/zh-TW.h
index 2780181aa..b1a46d3a4 100644
--- a/sonoff/language/zh-TW.h
+++ b/sonoff/language/zh-TW.h
@@ -540,6 +540,9 @@
 #define D_SENSOR_RF_SENSOR "RF Sensor"
 #define D_SENSOR_AZ_RX   "AZ Rx"
 #define D_SENSOR_AZ_TX   "AZ Tx"
+#define D_SENSOR_MAX31855_CS  "MAX31855 CS"
+#define D_SENSOR_MAX31855_CLK "MAX31855 CLK"
+#define D_SENSOR_MAX31855_DO  "MAX31855 DO"
 
 // Units
 #define D_UNIT_AMPERE "安"
diff --git a/sonoff/my_user_config.h b/sonoff/my_user_config.h
index 8684ac7a0..69f21dec7 100644
--- a/sonoff/my_user_config.h
+++ b/sonoff/my_user_config.h
@@ -285,6 +285,9 @@
 //  #define W1_PARASITE_POWER                      // If using USE_DS18x20 then optimize for parasite powered sensors
 //  #define DS18B20_INTERNAL_PULLUP	               // Use INPUT_PULLUP internal pullup resistors for single DS18B20
 
+// -- SPI sensors ----------------------------------
+#define USE_MAX31855                           // Enable MAX31855 K-Type thermocouple sensor
+
 // -- I2C sensors ---------------------------------
 #define USE_I2C                                  // I2C using library wire (+10k code, 0k2 mem, 124 iram)
 
diff --git a/sonoff/sonoff_template.h b/sonoff/sonoff_template.h
index 7c590085e..2ab1eaaf8 100644
--- a/sonoff/sonoff_template.h
+++ b/sonoff/sonoff_template.h
@@ -143,6 +143,9 @@ enum UserSelectablePins {
   GPIO_RF_SENSOR,      // Rf receiver with sensor decoding
   GPIO_AZ_TXD,         // AZ-Instrument 7798 Serial interface
   GPIO_AZ_RXD,         // AZ-Instrument 7798 Serial interface
+  GPIO_MAX31855CS,     // MAX31855 Serial interface
+  GPIO_MAX31855CLK,    // MAX31855 Serial interface
+  GPIO_MAX31855DO,     // MAX31855 Serial interface
   GPIO_SENSOR_END };
 
 // Programmer selectable GPIO functionality offset by user selectable GPIOs
@@ -204,7 +207,8 @@ const char kSensorNames[] PROGMEM =
   D_SENSOR_MGC3130_XFER "|" D_SENSOR_MGC3130_RESET "|"
   D_SENSOR_SSPI_MISO "|" D_SENSOR_SSPI_MOSI "|" D_SENSOR_SSPI_SCLK "|" D_SENSOR_SSPI_CS "|" D_SENSOR_SSPI_DC "|"
   D_SENSOR_RF_SENSOR "|"
-  D_SENSOR_AZ_TX "|" D_SENSOR_AZ_RX;
+  D_SENSOR_AZ_TX "|" D_SENSOR_AZ_RX "|"
+  D_SENSOR_MAX31855_CS "|" D_SENSOR_MAX31855_CLK "|" D_SENSOR_MAX31855_DO;
 
 /********************************************************************************************/
 
@@ -466,6 +470,11 @@ const uint8_t kGpioNiceList[] PROGMEM = {
   GPIO_AZ_TXD,         // AZ-Instrument 7798 CO2 datalogger Serial interface
   GPIO_AZ_RXD,         // AZ-Instrument 7798 CO2 datalogger Serial interface
 #endif
+#ifdef USE_MAX31855
+  GPIO_MAX31855CS,   // MAX31855 Serial interface
+  GPIO_MAX31855CLK,  // MAX31855 Serial interface
+  GPIO_MAX31855DO,   // MAX31855 Serial interface    
+#endif
 };
 
 const uint8_t kModuleNiceList[MAXMODULE] PROGMEM = {
diff --git a/sonoff/xsns_39_max31855.ino b/sonoff/xsns_39_max31855.ino
new file mode 100644
index 000000000..02288ca4b
--- /dev/null
+++ b/sonoff/xsns_39_max31855.ino
@@ -0,0 +1,176 @@
+/*
+  xsns_39_max31855.ino - MAX31855 thermocouple sensor support for Sonoff-Tasmota
+
+  Copyright (C) 2018  Markus Past
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifdef USE_MAX31855
+
+#define XSNS_39              39
+
+bool initialized = false;
+
+struct MAX31855_ResultStruct{
+    uint8_t ErrorCode;                  // Error Codes: 0 = No Error / 1 = TC open circuit / 2 = TC short to GND / 4 = TC short to VCC
+    float ProbeTemperature;             // Measured temperature of the 'hot' TC junction (probe temp)
+    float ReferenceTemperature;         // Measured temperature of the 'cold' TC junction (reference temp)
+} MAX31855_Result;
+
+void MAX31855_Init(void){
+    if(initialized)
+        return;
+
+    // Set GPIO modes for SW-SPI
+    pinMode(pin[GPIO_MAX31855CS], OUTPUT);
+    pinMode(pin[GPIO_MAX31855CLK], OUTPUT);
+    pinMode(pin[GPIO_MAX31855DO], INPUT);
+
+    // Chip not selected / Clock low
+    digitalWrite(pin[GPIO_MAX31855CS], HIGH);
+    digitalWrite(pin[GPIO_MAX31855CLK], LOW);
+
+    initialized = true;
+}
+
+/*
+*   MAX31855_GetResult(void)
+*   Acquires the raw data via SPI, checks for MAX31855 errors and fills result structure
+*/
+void MAX31855_GetResult(void){
+    int32_t RawData = MAX31855_ShiftIn(32);
+    uint8_t probeerror = RawData & 0x7;
+
+    MAX31855_Result.ErrorCode = probeerror;
+    MAX31855_Result.ReferenceTemperature = MAX31855_GetReferenceTemperature(RawData);
+    if(probeerror)
+        MAX31855_Result.ProbeTemperature = NAN;     // Return NaN if MAX31855 reports an error
+    else
+        MAX31855_Result.ProbeTemperature = MAX31855_GetProbeTemperature(RawData);
+}
+
+
+/*
+*   MAX31855_GetProbeTemperature(int32_t RawData)
+*   Decodes and returns the temperature of TCs 'hot' junction from RawData
+*/
+float MAX31855_GetProbeTemperature(int32_t RawData){
+    if(RawData & 0x80000000)
+        RawData = (RawData >> 18) | 0xFFFFC000;     // Negative value - Drop lower 18 bits and extend to negative number
+    else
+        RawData >>= 18;                             // Positiv value - Drop lower 18 bits
+
+    float result = (RawData * 0.25);                // MAX31855 LSB resolution is 0.25°C for probe temperature
+
+    return (Settings.flag.temperature_conversion) ? ConvertTemp(result) : result;   // Check if we have to convert to Fahrenheit
+}
+
+/*
+*   MAX31855_GetReferenceTemperature(int32_t RawData)
+*   Decodes and returns the temperature of TCs 'cold' junction from RawData
+*/
+float MAX31855_GetReferenceTemperature(int32_t RawData){
+    if(RawData & 0x8000)
+        RawData = (RawData >> 4) | 0xFFFFF000;      // Negative value - Drop lower 4 bits and extend to negative number
+    else
+        RawData = (RawData >> 4) & 0x00000FFF;      // Positiv value - Drop lower 4 bits and mask out remaining bits (probe temp, error bit, etc.)
+
+    float result = (RawData * 0.0625);              // MAX31855 LSB resolution is 0.0625°C for reference temperature
+
+    return (Settings.flag.temperature_conversion) ? ConvertTemp(result) : result;   // Check if we have to convert to Fahrenheit
+}
+
+/*
+*   MAX31855_ShiftIn(uint8_t Length)
+*   Communicates with MAX31855 via SW-SPI and returns the raw data read from the chip
+*/
+int32_t MAX31855_ShiftIn(uint8_t Length){
+    int32_t dataIn = 0;
+
+    digitalWrite(pin[GPIO_MAX31855CS], LOW);            // CS = LOW -> Start SPI communication
+    delayMicroseconds(1);                               // CS fall to output enable = max. 100ns
+    
+    for(uint8_t i = 0; i < Length; i++)
+    {
+        digitalWrite(pin[GPIO_MAX31855CLK], LOW);
+        delayMicroseconds(1);                           // CLK pulse width low = min. 100ns / CLK fall to output valid = max. 40ns
+        dataIn <<= 1;
+        if(digitalRead(pin[GPIO_MAX31855DO]))
+            dataIn |= 1;
+        digitalWrite(pin[GPIO_MAX31855CLK], HIGH);
+        delayMicroseconds(1);                           // CLK pulse width high = min. 100ns
+    }
+
+    digitalWrite(pin[GPIO_MAX31855CS], HIGH);           // CS = HIGH -> End SPI communication
+    digitalWrite(pin[GPIO_MAX31855CLK], LOW);
+    return dataIn;    
+}
+
+void MAX31855_Show(bool Json){
+    char probetemp[33];
+    char referencetemp[33];
+    dtostrfd(MAX31855_Result.ProbeTemperature, Settings.flag2.temperature_resolution, probetemp);
+    dtostrfd(MAX31855_Result.ReferenceTemperature, Settings.flag2.temperature_resolution, referencetemp);
+
+    if(Json){
+        snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s,\"%s\":{\"" D_JSON_PROBETEMPERATURE "\":%s,\"" D_JSON_REFERENCETEMPERATURE "\":%s,\"" D_JSON_ERROR "\":%d}"), \
+            mqtt_data, "MAX31855", probetemp, referencetemp, MAX31855_Result.ErrorCode);
+#ifdef USE_DOMOTICZ
+        if (0 == tele_period) {
+          DomoticzSensor(DZ_TEMP, probetemp);
+        }
+#endif  // USE_DOMOTICZ
+#ifdef USE_KNX
+        if (0 == tele_period) {
+          KnxSensor(KNX_TEMPERATURE, MAX31855_Result.ProbeTemperature);
+        }
+#endif  // USE_KNX
+    } else {
+#ifdef USE_WEBSERVER
+        snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, "MAX31855", probetemp, TempUnit());
+#endif  // USE_WEBSERVER
+    }
+}
+
+/*********************************************************************************************\
+ * Interface
+\*********************************************************************************************/
+
+boolean Xsns39(byte function)
+{
+  boolean result = false;
+  if((pin[GPIO_MAX31855CS] < 99) && (pin[GPIO_MAX31855CLK] < 99) && (pin[GPIO_MAX31855DO] < 99)){
+
+    switch (function) {
+      case FUNC_INIT:
+        MAX31855_Init();
+        break;
+      case FUNC_EVERY_SECOND:
+        MAX31855_GetResult();
+        break;
+      case FUNC_JSON_APPEND:
+        MAX31855_Show(true);
+        break;
+#ifdef USE_WEBSERVER
+      case FUNC_WEB_APPEND:
+        MAX31855_Show(false);
+        break;
+#endif  // USE_WEBSERVER
+    }
+  }
+  return result;
+}
+
+#endif  // USE_MAX31855
\ No newline at end of file