diff --git a/BUILDS.md b/BUILDS.md
index ca97f2514..a611c9f77 100644
--- a/BUILDS.md
+++ b/BUILDS.md
@@ -146,6 +146,7 @@ Note: `minimal` variant is not listed as it shouldn't be used outside of the [up
 | USE_PCF8574               | - | - / - | - | - | - | - |
 | USE_PMSA003I              | - | - / - | - | - | - | - |
 | USE_LOX_O2                | - | - / x | - | x | - | - |
+| USE_GDK101                | - | - / - | - | x | - | - |
 |                           |   |       |   |   |   |   |
 | Feature or Sensor         | l | t     | k | s | i | d | Remarks
 | USE_HIH6                  | - | - / x | - | x | - | - |
diff --git a/CODE_OWNERS.md b/CODE_OWNERS.md
index 7d16b2b3b..2c8374b59 100644
--- a/CODE_OWNERS.md
+++ b/CODE_OWNERS.md
@@ -204,6 +204,7 @@ In addition to @arendst the following code is mainly owned by:
 | xsns_103_sen5x             | @tyeth
 | xsns_104_pmsa003i          | Jean-Pierre Deschamps
 | xsns_105_lox_o2            | @ACE1046
+| xsns_106_gdk101            | @Szewcson
 |                            |
 | Libraries                  |
 |                            |
diff --git a/I2CDEVICES.md b/I2CDEVICES.md
index abbab2f99..994490ddb 100644
--- a/I2CDEVICES.md
+++ b/I2CDEVICES.md
@@ -113,4 +113,5 @@ Index | Define              | Driver  | Device   | Address(es) | Description
   75  | USE_PCA9632         | xdrv_64  | PCA9632  | 0x60        | 4-channel 4-bit pwm driver
   76  | USE_SEN5X           | xsns_103 | SEN5X    | 0x69        | Gas (VOC/NOx index) and air quality (PPM <1,<2.5,<4,<10)
   77  | USE_MCP23XXX_DRV    | xdrv_67  | MCP23x17 | 0x20 - 0x26 | 16-bit I/O expander as virtual button/switch/relay
-  78  | USE_PMSA003I        | xsns_104 | PMSA003I | 0x12        | PM2.5 Air Quality Sensor with I2C Interface
\ No newline at end of file
+  78  | USE_PMSA003I        | xsns_104 | PMSA003I | 0x12        | PM2.5 Air Quality Sensor with I2C Interface
+  79  | USE_GDK101          | xsns_106 | GDK101   | 0x18 - 0x1B | Gamma Radiation Sensor
\ No newline at end of file
diff --git a/tasmota/include/i18n.h b/tasmota/include/i18n.h
index 530e20492..54e51a04f 100644
--- a/tasmota/include/i18n.h
+++ b/tasmota/include/i18n.h
@@ -934,6 +934,7 @@ const char HTTP_SNS_STANDARD_CONCENTRATION[] PROGMEM =        "{s}%s " D_STANDAR
 const char HTTP_SNS_ENVIRONMENTAL_CONCENTRATION[] PROGMEM =   "{s}%s " D_ENVIRONMENTAL_CONCENTRATION " %s " D_UNIT_MICROMETER "{m}%d " D_UNIT_MICROGRAM_PER_CUBIC_METER "{e}";
 const char HTTP_SNS_F_ENVIRONMENTAL_CONCENTRATION[] PROGMEM = "{s}%s " D_ENVIRONMENTAL_CONCENTRATION " %s " D_UNIT_MICROMETER "{m}%1_f " D_UNIT_MICROGRAM_PER_CUBIC_METER "{e}";
 const char HTTP_SNS_PARTICALS_BEYOND[] PROGMEM =              "{s}%s " D_PARTICALS_BEYOND            " %s " D_UNIT_MICROMETER "{m}%d " D_UNIT_PARTS_PER_DECILITER       "{e}";
+const char HTTP_SNS_AVG_RAD_DOSE[]     PROGMEM =              "{s}%s " D_AVG_RAD_DOSE                " %s " D_UNIT_MINUTE     "{m}%d.%02d " D_UNIT_US_H                  "{e}";
 
 const char HTTP_SNS_VOLTAGE[]             PROGMEM = "{s}" D_VOLTAGE                 "{m}%s " D_UNIT_VOLT          "{e}";
 const char HTTP_SNS_CURRENT[]             PROGMEM = "{s}" D_CURRENT                 "{m}%s " D_UNIT_AMPERE        "{e}";
diff --git a/tasmota/include/tasmota_configurations.h b/tasmota/include/tasmota_configurations.h
index 559a7e236..367c3b6a2 100644
--- a/tasmota/include/tasmota_configurations.h
+++ b/tasmota/include/tasmota_configurations.h
@@ -163,6 +163,7 @@
 //#define USE_HYT                                // [I2CDriver68] Enable HYTxxx temperature and humidity sensor (I2C address 0x28) (+0k5 code)
 //#define USE_LUXV30B                            // [I2CDriver70] Enable RFRobot SEN0390 LuxV30b ambient light sensor (I2C address 0x4A) (+0k5 code)
 //#define USE_PMSA003I                           // [I2cDriver78] Enable PMSA003I Air Quality Sensor (I2C address 0x12) (+1k8 code)
+#define USE_GDK101                               // [I2cDriver79] Enable GDK101 sensor (I2C addresses 0x18 - 0x1B) (+1k2 code)
 
 //#define USE_RTC_CHIPS                          // Enable RTC chip support and NTP server - Select only one
 //  #define USE_DS3231                           // [I2cDriver26] Enable DS3231 RTC (I2C address 0x68) (+1k2 code)
diff --git a/tasmota/language/af_AF.h b/tasmota/language/af_AF.h
index f588998c4..067ecf05d 100644
--- a/tasmota/language/af_AF.h
+++ b/tasmota/language/af_AF.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "te laag"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "pomptyd oorskry"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "Gemiddelde Stralingsdosis"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_AF_AF_H_
diff --git a/tasmota/language/bg_BG.h b/tasmota/language/bg_BG.h
index 6aecade5e..ca0eabab2 100644
--- a/tasmota/language/bg_BG.h
+++ b/tasmota/language/bg_BG.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "твърде ниско"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "превишено време за помпане"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "средна доза радиация"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_BG_BG_H_
diff --git a/tasmota/language/ca_AD.h b/tasmota/language/ca_AD.h
index 386d81141..20b427448 100644
--- a/tasmota/language/ca_AD.h
+++ b/tasmota/language/ca_AD.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "massa baix"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "temps de bomba excedit"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "dosi mitjana de radiació"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_CA_AD_H_
diff --git a/tasmota/language/cs_CZ.h b/tasmota/language/cs_CZ.h
index 4a9adf845..0752be295 100644
--- a/tasmota/language/cs_CZ.h
+++ b/tasmota/language/cs_CZ.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "too low"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "pump time exceeded"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "průměrná dávka záření"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_CS_CZ_H_
diff --git a/tasmota/language/de_DE.h b/tasmota/language/de_DE.h
index 5c57c51c1..7ced98891 100644
--- a/tasmota/language/de_DE.h
+++ b/tasmota/language/de_DE.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "zu niedrig"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "Pumpzeit überschritten"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "durchschnittliche Strahlendosis"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_DE_DE_H_
diff --git a/tasmota/language/el_GR.h b/tasmota/language/el_GR.h
index d4faa63d7..7228d86bb 100644
--- a/tasmota/language/el_GR.h
+++ b/tasmota/language/el_GR.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "too low"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "pump time exceeded"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "μέση δόση ακτινοβολίας"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_EL_GR_H_
diff --git a/tasmota/language/en_GB.h b/tasmota/language/en_GB.h
index d603de544..899a5691c 100644
--- a/tasmota/language/en_GB.h
+++ b/tasmota/language/en_GB.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "too low"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "pump time exceeded"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "Average Radiation Dose"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_EN_GB_H_
diff --git a/tasmota/language/es_ES.h b/tasmota/language/es_ES.h
index 6ca71b901..4a8585a01 100644
--- a/tasmota/language/es_ES.h
+++ b/tasmota/language/es_ES.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "muy bajo"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "tiempo de bomba excedido"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "dosis media de radiación"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_ES_ES_H_
diff --git a/tasmota/language/fr_FR.h b/tasmota/language/fr_FR.h
index 58751d164..3991ac470 100644
--- a/tasmota/language/fr_FR.h
+++ b/tasmota/language/fr_FR.h
@@ -1190,4 +1190,8 @@
 #define D_NEOPOOL_PH_LOW                  "Trop bas"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "durée pompage expirée"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "dose moyenne de rayonnement"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_FR_FR_H_
diff --git a/tasmota/language/fy_NL.h b/tasmota/language/fy_NL.h
index 55a7c39d1..eab5616e8 100644
--- a/tasmota/language/fy_NL.h
+++ b/tasmota/language/fy_NL.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "too low"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "pump time exceeded"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "gemiddelde stralingsdosis"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_FY_NL_H_
diff --git a/tasmota/language/he_HE.h b/tasmota/language/he_HE.h
index 07caf4f39..971d6c3e5 100644
--- a/tasmota/language/he_HE.h
+++ b/tasmota/language/he_HE.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "too low"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "pump time exceeded"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "מינון קרינה ממוצע"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_HE_HE_H_
diff --git a/tasmota/language/hu_HU.h b/tasmota/language/hu_HU.h
index ad3a0c60e..71944db5a 100644
--- a/tasmota/language/hu_HU.h
+++ b/tasmota/language/hu_HU.h
@@ -1192,4 +1192,8 @@
 #define D_NEOPOOL_PH_LOW                  "too low"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "pump time exceeded"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "átlagos sugárdózis"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_HU_HU_H_
diff --git a/tasmota/language/it_IT.h b/tasmota/language/it_IT.h
index 764609c50..c0495adb9 100644
--- a/tasmota/language/it_IT.h
+++ b/tasmota/language/it_IT.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "troppo basso"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "tempo pompa superato"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "dose media di radiazioni"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_IT_IT_H_
diff --git a/tasmota/language/ko_KO.h b/tasmota/language/ko_KO.h
index 365facce3..13213e643 100644
--- a/tasmota/language/ko_KO.h
+++ b/tasmota/language/ko_KO.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "too low"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "pump time exceeded"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "average radiation dose"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_KO_KO_H_
diff --git a/tasmota/language/nl_NL.h b/tasmota/language/nl_NL.h
index 68920272e..e4fd27026 100644
--- a/tasmota/language/nl_NL.h
+++ b/tasmota/language/nl_NL.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "te laag"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "pomptijd bereikt"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "gemiddelde stralingsdosis"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_NL_NL_H_
diff --git a/tasmota/language/pl_PL.h b/tasmota/language/pl_PL.h
index 0f7001baa..71d11945c 100644
--- a/tasmota/language/pl_PL.h
+++ b/tasmota/language/pl_PL.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "too low"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "czas pompowania przekroczony"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "Średnia Dawka Promieniowania"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_PL_PL_D_H_
diff --git a/tasmota/language/pt_BR.h b/tasmota/language/pt_BR.h
index 11d615803..6d43be611 100644
--- a/tasmota/language/pt_BR.h
+++ b/tasmota/language/pt_BR.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "Muito baixo"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "tempo da bomba excedido"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "dose média de radiação"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_PT_BR_H_
diff --git a/tasmota/language/pt_PT.h b/tasmota/language/pt_PT.h
index 8d7ce12ef..a91db261a 100644
--- a/tasmota/language/pt_PT.h
+++ b/tasmota/language/pt_PT.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "Muito baixo"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "tempo da bomba excedido"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "dose média de radiação"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_PT_PT_H_
diff --git a/tasmota/language/ro_RO.h b/tasmota/language/ro_RO.h
index a9300f72b..f9b5b79b7 100644
--- a/tasmota/language/ro_RO.h
+++ b/tasmota/language/ro_RO.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "too low"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "pump time exceeded"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "doza medie de radiație"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_RO_RO_H_
diff --git a/tasmota/language/ru_RU.h b/tasmota/language/ru_RU.h
index 2ace1a9dc..d1192b842 100644
--- a/tasmota/language/ru_RU.h
+++ b/tasmota/language/ru_RU.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "too low"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "pump time exceeded"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "средняя доза облучения"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_RU_RU_H_
diff --git a/tasmota/language/sk_SK.h b/tasmota/language/sk_SK.h
index bc5568259..30ebb0149 100644
--- a/tasmota/language/sk_SK.h
+++ b/tasmota/language/sk_SK.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "too low"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "pump time exceeded"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "priemerná dávka žiarenia"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_SK_SK_H_
diff --git a/tasmota/language/sv_SE.h b/tasmota/language/sv_SE.h
index 817255fae..1881739c6 100644
--- a/tasmota/language/sv_SE.h
+++ b/tasmota/language/sv_SE.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "too low"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "pump time exceeded"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "genomsnittlig stråldos"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_SV_SE_H_
diff --git a/tasmota/language/tr_TR.h b/tasmota/language/tr_TR.h
index df98b26cc..7fecfa418 100644
--- a/tasmota/language/tr_TR.h
+++ b/tasmota/language/tr_TR.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "too low"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "pump time exceeded"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "ortalama radyasyon dozu"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_TR_TR_H_
diff --git a/tasmota/language/uk_UA.h b/tasmota/language/uk_UA.h
index 54fb6e4f0..70acfb5b0 100644
--- a/tasmota/language/uk_UA.h
+++ b/tasmota/language/uk_UA.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "too low"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "pump time exceeded"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "середня доза радіації"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif // _LANGUAGE_UK_UA_H_
diff --git a/tasmota/language/vi_VN.h b/tasmota/language/vi_VN.h
index 267a9d403..9a0c740c4 100644
--- a/tasmota/language/vi_VN.h
+++ b/tasmota/language/vi_VN.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "too low"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "pump time exceeded"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "liều bức xạ trung bình"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_VI_VN_H_
diff --git a/tasmota/language/zh_CN.h b/tasmota/language/zh_CN.h
index 624fa32b9..f32ab17bd 100644
--- a/tasmota/language/zh_CN.h
+++ b/tasmota/language/zh_CN.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "too low"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "pump time exceeded"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "平均辐射剂量"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_ZH_CN_H_
diff --git a/tasmota/language/zh_TW.h b/tasmota/language/zh_TW.h
index 8b0433312..d34686626 100644
--- a/tasmota/language/zh_TW.h
+++ b/tasmota/language/zh_TW.h
@@ -1189,4 +1189,8 @@
 #define D_NEOPOOL_PH_LOW                  "too low"
 #define D_NEOPOOL_PUMP_TIME_EXCEEDED      "pump time exceeded"
 
+// xsns_106_gdk101.ino
+#define D_AVG_RAD_DOSE                    "平均輻射劑量"
+#define D_UNIT_US_H                       "uSv/h"
+
 #endif  // _LANGUAGE_ZH_TW_H_
diff --git a/tasmota/my_user_config.h b/tasmota/my_user_config.h
index ebc224061..a246126ab 100644
--- a/tasmota/my_user_config.h
+++ b/tasmota/my_user_config.h
@@ -701,6 +701,12 @@
 //    #define INA3221_MAX_COUNT                    // change the number of devices to search for (default 4).
 //                                                 // Both settings together allow to limit searching for INA3221 to only a subset of addresses
 //  #define USE_PMSA003I                           // [I2cDriver78] Enable PMSA003I Air Quality Sensor (I2C address 0x12) (+1k8 code)
+//  #define USE_GDK101                             // [I2cDriver79] Enable GDK101 sensor (I2C addresses 0x18 - 0x1B) (+1k2 code)
+//    #define GDK101_SHOW_FW_VERSION
+//    #define GDK101_SHOW_STATUS
+//    #define GDK101_SHOW_VIBRATION_STATUS
+//    #define GDK101_SHOW_MEAS_TIME
+
 
 //  #define USE_RTC_CHIPS                          // Enable RTC chip support and NTP server - Select only one
 //    #define USE_DS3231                           // [I2cDriver26] Enable DS3231 RTC (I2C address 0x68) (+1k2 code)
diff --git a/tasmota/tasmota_support/support_features.ino b/tasmota/tasmota_support/support_features.ino
index d889b4c69..7bdb9fb34 100644
--- a/tasmota/tasmota_support/support_features.ino
+++ b/tasmota/tasmota_support/support_features.ino
@@ -885,8 +885,10 @@ void ResponseAppendFeatures(void)
 #ifdef USE_LOX_O2
     feature9 |= 0x00080000;  // xsns_105_lox_o2.ino
 #endif
+#if defined(USE_I2C) && defined(USE_GDK101)
+    feature9 |= 0x00100000;  // xsns_106_gdk101.ino
+#endif
 
-//    feature9 |= 0x00100000;
 //    feature9 |= 0x00200000;
 //    feature9 |= 0x00400000;
 //    feature9 |= 0x00800000;
diff --git a/tasmota/tasmota_xsns_sensor/xsns_106_gdk101.ino b/tasmota/tasmota_xsns_sensor/xsns_106_gdk101.ino
new file mode 100644
index 000000000..e8cdcb782
--- /dev/null
+++ b/tasmota/tasmota_xsns_sensor/xsns_106_gdk101.ino
@@ -0,0 +1,302 @@
+/*
+  xsns_106_gdk101.ino - Support for GDK101 gamma radiation sensor
+   
+  Copyright (C) 2019   Petr Novacek
+
+  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_I2C
+#ifdef USE_GDK101
+
+/*********************************************************************************************\
+ * GDK101 gamma radiation sensor ftlab.co.kr
+ *
+ * For background information see http://allsmartlab.com/eng/294-2/
+ *
+ * I2C Address: 
+ * A0 Short, A1 Short : 0x18
+ * A0 Open,  A1 Short : 0x19
+ * A0 Short, A1 Open  : 0x1A
+ * A0 Open,  A1 Open  : 0x1B
+\*********************************************************************************************/
+
+#define XSNS_106  106
+
+#define XI2C_79   79  // See I2CDEVICES.md
+
+// I2C adresses
+#define GDK101_ADDRESS1					0x18
+#define GDK101_ADDRESS2					0x19
+#define GDK101_ADDRESS3					0x1A
+#define GDK101_ADDRESS4					0x1B
+
+// I2C register
+#define READ_FIRMWARE           0xB4
+#define RESET                   0xA0
+#define READ_STATUS             0xB0
+#define READ_MEASURING_TIME     0xB1
+#define READ_10MIN_AVG          0xB2 
+#define READ_1MIN_AVG           0xB3
+
+// gdk101 variables
+uint8_t gdk101_address;
+uint8_t gdk101_addresses[] = { GDK101_ADDRESS1, GDK101_ADDRESS2, GDK101_ADDRESS3, GDK101_ADDRESS4 };
+uint8_t gdk101_discovered = false;
+
+typedef enum {
+ GDK_STATUS_READY,
+ GDK_STATUS_UNDER_10_MINUTES,
+ GDK_STATUS_NORMAL,
+ GDK_STATUS_INVALID,
+} gdk_status_t;
+
+typedef struct gdk_status_data {
+  gdk_status_t status;
+  bool vibration;
+} gdk_status_data_t;
+
+typedef struct gdk_measuring_time {
+  uint8_t min;
+  uint8_t sec;
+} gdk_measuring_time_t;
+
+typedef struct gdk_fW_version {
+  uint8_t major;
+  uint8_t minor;
+} gdk_fW_version_t;
+
+typedef struct gdk_avg_dose {
+  uint8_t integral;
+  uint8_t fractional;
+} gdk_avg_dose_t;
+
+bool gdk_ready = false;
+gdk_fW_version_t fw_version;
+gdk_avg_dose_t mea_10min_avg;
+gdk_avg_dose_t mea_1min_avg;
+gdk_status_data_t gdk_status = {GDK_STATUS_INVALID, false};
+gdk_measuring_time_t gdk_time = {0, 0};
+uint8_t evr10 = 0;
+// uint8_t vibr = 0;
+
+#ifdef USE_WEBSERVER
+const char HTTP_GDK101_FW[] PROGMEM = "{s}%s " "FW Version" "{m}%d.%d{e}";
+const char HTTP_GDK101_STATUS[] PROGMEM = "{s}%s " "Status" "{m}%d{e}";
+const char HTTP_GDK101_VIB_STATUS[] PROGMEM = "{s}%s " "Vibration Status" "{m}%d{e}";
+const char HTTP_GDK101_MEAS_TIME[] PROGMEM = "{s}%s " "Measurement Time" "{m}%d:%02d{e}";
+#endif  // USE_WEBSERVER
+
+bool gdk101_reset(bool *reset);
+
+void gdk101_err_log(bool ret) {
+  if(!ret) {
+     DEBUG_SENSOR_LOG("GDK101: I2C read error");
+  }
+}
+
+void gdk101_detect(void)
+{
+  bool ret = false;
+  bool reset = false;
+  for (uint32_t i = 0; i < sizeof(gdk101_addresses); i++) {
+    gdk101_address = gdk101_addresses[i];
+    if (!I2cSetDevice(gdk101_address)) {
+      continue; // do not make the next step without a confirmed device on the bus
+    }
+    ret = gdk101_reset(&reset);
+    if(ret) {
+      if(reset) {
+        delay(10);
+        I2cSetActiveFound(gdk101_address, "GDK101");
+        ret = gdk101_get_fw_version(&fw_version);
+        gdk101_err_log(ret);
+        gdk_ready = true;
+        break;
+      }
+    }
+  }
+}
+
+void gdk101_init() {
+
+  if (gdk_ready) return;
+  
+  gdk101_detect();
+
+}
+
+bool gdk101_reset(bool *reset) {
+  uint8_t buf;
+  bool ret = false;
+  ret = I2cValidRead8(&buf, gdk101_address, RESET);
+  if (ret) {
+    *reset = (bool) buf;
+  }
+  return ret;
+}
+
+bool gdk101_get_fw_version(struct gdk_fW_version *fw) {
+  uint8_t buf[2];
+  bool ret = false;
+  ret = I2cValidRead16LE((uint16_t*) buf, gdk101_address, READ_FIRMWARE);
+  if (ret) {
+    fw->major = buf[0];
+    fw->minor = buf[1];
+  }
+  return ret;
+}
+
+bool gdk101_get_10min_avg(struct gdk_avg_dose *avg) {
+  uint8_t buf[2];
+  bool ret = false;
+  ret = I2cValidRead16LE((uint16_t*) buf, gdk101_address, READ_10MIN_AVG);
+  if (ret) {
+    avg->integral = buf[0];
+    avg->fractional = buf[1];
+  }
+  return ret;
+}
+
+bool gdk101_get_1min_avg(struct gdk_avg_dose *avg) {
+  uint8_t buf[2];
+  bool ret = false;
+  ret = I2cValidRead16LE((uint16_t*) buf, gdk101_address, READ_1MIN_AVG);
+  if (ret) {
+    avg->integral = buf[0];
+    avg->fractional = buf[1];
+  }
+  return ret;
+}
+
+bool gdk101_get_status(struct gdk_status_data *status) {
+  uint8_t buf[2];
+  bool ret = false;
+  ret = I2cValidRead16LE((uint16_t*) buf, gdk101_address, READ_STATUS);
+  if (ret) {
+    status->status = (gdk_status_t) buf[0];
+    status->vibration = (bool) buf[1];
+  }
+  return ret;
+}
+
+bool gdk101_get_measuring_time(struct gdk_measuring_time *meas_time) {
+  uint8_t buf[2];
+  bool ret = false;
+  ret = I2cValidRead16LE((uint16_t*) buf, gdk101_address, READ_MEASURING_TIME);
+  if (ret) {
+    meas_time->min = buf[0];
+    meas_time->sec = buf[1];
+  }
+  return ret;
+}
+
+void every_second(void) {
+  if (!gdk_ready) return;
+  
+  gdk101_every_second();
+  
+  if (evr10 == 10) {
+    gdk101_every_10_second();
+    evr10 = 1;
+  }
+  else {
+    evr10++;
+  }
+
+}
+
+void gdk101_every_second(void) {
+  bool ret = false;
+
+  ret = gdk101_get_status(&gdk_status);
+  gdk101_err_log(ret);
+}
+
+void gdk101_every_10_second(void) {
+  bool ret = false;
+
+  ret = gdk101_get_10min_avg(&mea_10min_avg);
+  gdk101_err_log(ret);
+  ret = gdk101_get_1min_avg(&mea_1min_avg);
+  gdk101_err_log(ret);
+  ret = gdk101_get_measuring_time(&gdk_time);
+  gdk101_err_log(ret);
+}
+
+void gdk101_show(uint8_t json) {
+  char types[16];
+  strcpy_P(types, PSTR("GDK101"));
+
+  if (!gdk_ready) return;
+
+  if (json) {
+    ResponseAppend_P(PSTR(",\"%s\":{"), types);
+    ResponseAppend_P(PSTR("\"FW_V\":%i.%i,"), fw_version.major, fw_version.minor);
+    ResponseAppend_P(PSTR("\"10MIN_AVG\":%i.%02i,"), mea_10min_avg.integral, mea_10min_avg.fractional);
+    ResponseAppend_P(PSTR("\"1MIN_AVG\":%i.%02i,"), mea_1min_avg.integral, mea_1min_avg.fractional);
+    ResponseAppend_P(PSTR("\"STATUS\":%i,"), gdk_status.status);
+    ResponseAppend_P(PSTR("\"VIBRATION\":%i,"), gdk_status.vibration);
+    ResponseAppend_P(PSTR("\"MEAS_TIME\":\"%i:%02i\""), gdk_time.min, gdk_time.sec);
+    ResponseJsonEnd();
+#ifdef USE_WEBSERVER
+  } else {
+#ifdef GDK101_SHOW_FW_VERSION
+    WSContentSend_PD(HTTP_GDK101_FW, types, fw_version.major, fw_version.minor);
+#endif
+    WSContentSend_PD(HTTP_SNS_AVG_RAD_DOSE, types, "@10", mea_10min_avg.integral, mea_10min_avg.fractional);
+    WSContentSend_PD(HTTP_SNS_AVG_RAD_DOSE, types, "@1", mea_1min_avg.integral, mea_1min_avg.fractional);
+#ifdef GDK101_SHOW_STATUS
+    WSContentSend_PD(HTTP_GDK101_STATUS, types, gdk_status.status);
+#endif
+#ifdef GDK101_SHOW_VIBRATION_STATUS
+    WSContentSend_PD(HTTP_GDK101_VIB_STATUS, types, gdk_status.vibration);
+#endif
+#ifdef GDK101_SHOW_MEAS_TIME
+    WSContentSend_PD(HTTP_GDK101_MEAS_TIME, types, gdk_time.min, gdk_time.sec);
+#endif
+#endif  // USE_WEBSERVER
+  }
+}
+/*********************************************************************************************\
+   Interface
+\*********************************************************************************************/
+
+bool Xsns106(uint32_t function)
+{
+  bool result = false;
+
+  if (!I2cEnabled(XI2C_79)) { return false; }
+
+  switch (function) {
+    case FUNC_INIT:
+      gdk101_init();
+      break;
+    case FUNC_EVERY_SECOND:
+      every_second();
+      break;
+    case FUNC_JSON_APPEND:
+      gdk101_show(1);
+      break;
+#ifdef USE_WEBSERVER
+    case FUNC_WEB_SENSOR:
+      gdk101_show(0);
+      break;
+#endif  // USE_WEBSERVER
+  }
+  return result;
+}
+
+#endif  // USE_GDK
+#endif  // USE_I2C