diff --git a/tasmota/language/af_AF.h b/tasmota/language/af_AF.h
index 4b72c6837..60460a97a 100644
--- a/tasmota/language/af_AF.h
+++ b/tasmota/language/af_AF.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/tasmota/language/bg_BG.h b/tasmota/language/bg_BG.h
index 7e7cf52d0..602091030 100644
--- a/tasmota/language/bg_BG.h
+++ b/tasmota/language/bg_BG.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/tasmota/language/cs_CZ.h b/tasmota/language/cs_CZ.h
index cfa6c5625..1a731d7fa 100644
--- a/tasmota/language/cs_CZ.h
+++ b/tasmota/language/cs_CZ.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/tasmota/language/de_DE.h b/tasmota/language/de_DE.h
index b67a77851..bd4306de9 100644
--- a/tasmota/language/de_DE.h
+++ b/tasmota/language/de_DE.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/tasmota/language/el_GR.h b/tasmota/language/el_GR.h
index 1ce06a5bb..df9fd6fff 100644
--- a/tasmota/language/el_GR.h
+++ b/tasmota/language/el_GR.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/tasmota/language/en_GB.h b/tasmota/language/en_GB.h
index 45a0ca3ca..71bd64bac 100644
--- a/tasmota/language/en_GB.h
+++ b/tasmota/language/en_GB.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/tasmota/language/es_ES.h b/tasmota/language/es_ES.h
index 621f97679..a317601ad 100644
--- a/tasmota/language/es_ES.h
+++ b/tasmota/language/es_ES.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/tasmota/language/fr_FR.h b/tasmota/language/fr_FR.h
index 83b2063c9..8a28c747d 100644
--- a/tasmota/language/fr_FR.h
+++ b/tasmota/language/fr_FR.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/tasmota/language/fy_NL.h b/tasmota/language/fy_NL.h
index 86be5540a..7addac432 100644
--- a/tasmota/language/fy_NL.h
+++ b/tasmota/language/fy_NL.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/tasmota/language/he_HE.h b/tasmota/language/he_HE.h
index 649df5e4b..9c0941429 100644
--- a/tasmota/language/he_HE.h
+++ b/tasmota/language/he_HE.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/tasmota/language/hu_HU.h b/tasmota/language/hu_HU.h
index d09d68b55..6fad9fbb5 100644
--- a/tasmota/language/hu_HU.h
+++ b/tasmota/language/hu_HU.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/tasmota/language/it_IT.h b/tasmota/language/it_IT.h
index 56b9f1944..f48d7f1e4 100644
--- a/tasmota/language/it_IT.h
+++ b/tasmota/language/it_IT.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK            "74x595 - RCLK"
 #define D_GPIO_SHIFT595_OE              "74x595 - OE"
 #define D_GPIO_SHIFT595_SER             "74x595 - SER"
+#define D_SENSOR_CM11_TX                "CM110x TX"
+#define D_SENSOR_CM11_RX                "CM110x RX"
 
 // Units
 #define D_UNIT_AMPERE                     "A"
diff --git a/tasmota/language/ko_KO.h b/tasmota/language/ko_KO.h
index e503f55d4..85306451c 100644
--- a/tasmota/language/ko_KO.h
+++ b/tasmota/language/ko_KO.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/tasmota/language/nl_NL.h b/tasmota/language/nl_NL.h
index afe73ad75..17803a9b0 100644
--- a/tasmota/language/nl_NL.h
+++ b/tasmota/language/nl_NL.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/tasmota/language/pl_PL.h b/tasmota/language/pl_PL.h
index e69836af6..68ea8596c 100644
--- a/tasmota/language/pl_PL.h
+++ b/tasmota/language/pl_PL.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/tasmota/language/pt_BR.h b/tasmota/language/pt_BR.h
index 4ab70c0b6..b3314554e 100644
--- a/tasmota/language/pt_BR.h
+++ b/tasmota/language/pt_BR.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/tasmota/language/pt_PT.h b/tasmota/language/pt_PT.h
index c7d398fbb..357aec476 100644
--- a/tasmota/language/pt_PT.h
+++ b/tasmota/language/pt_PT.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/tasmota/language/ro_RO.h b/tasmota/language/ro_RO.h
index e2f01aff9..ab325f19a 100644
--- a/tasmota/language/ro_RO.h
+++ b/tasmota/language/ro_RO.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/tasmota/language/ru_RU.h b/tasmota/language/ru_RU.h
index ad70639de..927a5e38d 100644
--- a/tasmota/language/ru_RU.h
+++ b/tasmota/language/ru_RU.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "А"
diff --git a/tasmota/language/sk_SK.h b/tasmota/language/sk_SK.h
index e61bc00ec..322b412cb 100644
--- a/tasmota/language/sk_SK.h
+++ b/tasmota/language/sk_SK.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/tasmota/language/sv_SE.h b/tasmota/language/sv_SE.h
index 8f47e8be7..ed1298eb2 100644
--- a/tasmota/language/sv_SE.h
+++ b/tasmota/language/sv_SE.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/tasmota/language/tr_TR.h b/tasmota/language/tr_TR.h
index 70c6c958a..b238b88b9 100644
--- a/tasmota/language/tr_TR.h
+++ b/tasmota/language/tr_TR.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/tasmota/language/uk_UA.h b/tasmota/language/uk_UA.h
index a2903fdc6..b75e1f04a 100644
--- a/tasmota/language/uk_UA.h
+++ b/tasmota/language/uk_UA.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE                    "А"
diff --git a/tasmota/language/vi_VN.h b/tasmota/language/vi_VN.h
index fb91d7201..13242d134 100644
--- a/tasmota/language/vi_VN.h
+++ b/tasmota/language/vi_VN.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/tasmota/language/zh_CN.h b/tasmota/language/zh_CN.h
index c7cc7a136..bd9b96293 100644
--- a/tasmota/language/zh_CN.h
+++ b/tasmota/language/zh_CN.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "A"
diff --git a/tasmota/language/zh_TW.h b/tasmota/language/zh_TW.h
index 563e2f666..8689fcddd 100644
--- a/tasmota/language/zh_TW.h
+++ b/tasmota/language/zh_TW.h
@@ -852,6 +852,8 @@
 #define D_GPIO_SHIFT595_RCLK   "74x595 RCLK"
 #define D_GPIO_SHIFT595_OE     "74x595 OE"
 #define D_GPIO_SHIFT595_SER    "74x595 SER"
+#define D_SENSOR_CM11_TX       "CM110x TX" 
+#define D_SENSOR_CM11_RX       "CM110x RX" 
 
 // Units
 #define D_UNIT_AMPERE "安培"
diff --git a/tasmota/my_user_config.h b/tasmota/my_user_config.h
index 444aa1bad..9d43927e8 100644
--- a/tasmota/my_user_config.h
+++ b/tasmota/my_user_config.h
@@ -724,6 +724,7 @@
 // -- Serial sensors ------------------------------
 //#define USE_MHZ19                                // Add support for MH-Z19 CO2 sensor (+2k code)
 //#define USE_SENSEAIR                             // Add support for SenseAir K30, K70 and S8 CO2 sensor (+2k3 code)
+//#define USE_CM110x                                // Add support for CM110x CO2 sensors (+2k7code)
   #define CO2_LOW              800               // Below this CO2 value show green light (needs PWM or WS2812 RG(B) led and enable with SetOption18 1)
   #define CO2_HIGH             1200              // Above this CO2 value show red light (needs PWM or WS2812 RG(B) led and enable with SetOption18 1)
 //#define USE_PMS5003                              // Add support for PMS5003 and PMS7003 particle concentration sensor (+1k3 code)
diff --git a/tasmota/support_features.ino b/tasmota/support_features.ino
index d9bbd259b..a8be4bd25 100644
--- a/tasmota/support_features.ino
+++ b/tasmota/support_features.ino
@@ -788,7 +788,9 @@ void ResponseAppendFeatures(void)
 #ifdef USE_SDM230
     feature8 |= 0x00100000;  // xnrg_21_sdm230.ino
 #endif
-//    feature8 |= 0x00200000;
+#ifdef USE_CM110x
+    feature8 |= 0x00200000; // xsns_95_cm110x.ino
+#endif
 //    feature8 |= 0x00400000;
 //    feature8 |= 0x00800000;
 
diff --git a/tasmota/tasmota_configurations_ESP32.h b/tasmota/tasmota_configurations_ESP32.h
index bdcfcee65..16c7fc488 100644
--- a/tasmota/tasmota_configurations_ESP32.h
+++ b/tasmota/tasmota_configurations_ESP32.h
@@ -340,6 +340,7 @@
 
 //#define USE_MHZ19                                // Add support for MH-Z19 CO2 sensor (+2k code)
 //#define USE_SENSEAIR                             // Add support for SenseAir K30, K70 and S8 CO2 sensor (+2k3 code)
+//#define USE_CM110x                               // Add support for CM110x CO2 sensors (+2k7 code)
 #ifndef CO2_LOW
   #define CO2_LOW              800               // Below this CO2 value show green light (needs PWM or WS2812 RG(B) led and enable with SetOption18 1)
 #endif
@@ -476,6 +477,7 @@
 
 #define USE_MHZ19                                // Add support for MH-Z19 CO2 sensor (+2k code)
 #define USE_SENSEAIR                             // Add support for SenseAir K30, K70 and S8 CO2 sensor (+2k3 code)
+#define USE_CM110x                               // Add support for CM110x CO2 sensors (+2k7 code)
 #ifndef CO2_LOW
   #define CO2_LOW              800               // Below this CO2 value show green light (needs PWM or WS2812 RG(B) led and enable with SetOption18 1)
 #endif
diff --git a/tasmota/tasmota_template.h b/tasmota/tasmota_template.h
index 5ccb040d3..7501fc407 100644
--- a/tasmota/tasmota_template.h
+++ b/tasmota/tasmota_template.h
@@ -181,6 +181,7 @@ enum UserSelectablePins {
   GPIO_OPTION_E,                       // Emulated module
   GPIO_SDM230_TX, GPIO_SDM230_RX,      // SDM230 Serial interface
   GPIO_ADC_MQ,                         // Analog MQ Sensor
+  GPIO_CM11_TXD, GPIO_CM11_RXD,        // CM11 Serial interface
   GPIO_SENSOR_END };
 
 enum ProgramSelectablePins {
@@ -400,7 +401,8 @@ const char kSensorNames[] PROGMEM =
   D_SENSOR_SOLAXX1_RTS "|"
   D_SENSOR_OPTION " E|"
   D_SENSOR_SDM230_TX "|" D_SENSOR_SDM230_RX "|"
-  D_SENSOR_ADC_MQ
+  D_SENSOR_ADC_MQ "|"
+  D_SENSOR_CM11_TX "|" D_SENSOR_CM11_RX "|"
   ;
 
 const char kSensorNamesFixed[] PROGMEM =
@@ -934,6 +936,10 @@ const uint16_t kGpioNiceList[] PROGMEM = {
   AGPIO(GPIO_MAX7219CS),
 #endif  // USE_DISPLAY_MAX7219
 
+#ifdef USE_CM110x
+  AGPIO(GPIO_CM11_TXD),        // CM110x Serial interface
+  AGPIO(GPIO_CM11_RXD),        // CM110x Serial interface
+#endif
 /*-------------------------------------------------------------------------------------------*\
  * ESP32 specifics
 \*-------------------------------------------------------------------------------------------*/
diff --git a/tasmota/xsns_95_cm110x.ino b/tasmota/xsns_95_cm110x.ino
new file mode 100644
index 000000000..17c090c10
--- /dev/null
+++ b/tasmota/xsns_95_cm110x.ino
@@ -0,0 +1,465 @@
+/*
+  XSNS_95_cm1107.ino - CM1107(B) CO2 sensor support for Tasmota
+
+  Copyright (C) 2021  Theo Arends
+
+  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_CM110x
+/*********************************************************************************************\
+ * CM11xx - CO2 sensor
+ * https://en.gassensor.com.cn/CO2Sensor/list.html
+ * Adapted from Mhz19 plugin by Maksim (rekin.m ___ gmail.com)
+ *
+ * Hardware Serial will be selected if GPIO1 = [CM11 Rx] and GPIO3 = [CM11 Tx]
+ **********************************************************************************************
+ * Filter usage
+ *
+ * Select filter usage on low stability readings
+ * 
+ * *******************************************************************************************
+ * Some CM11 models has manual or continuos modes - this logic not implemented.
+\*********************************************************************************************/
+
+#define XSNS_95                      95
+
+enum CM11FilterOptions {CM1107_FILTER_OFF, CM1107_FILTER_FAST, CM1107_FILTER_MEDIUM, CM1107_FILTER_MEDIUM2, CM1107_FILTER_SLOW};
+
+#ifndef CM1107_FILTER_OPTION
+  #define CM1107_FILTER_OPTION          CM1107_FILTER_FAST
+#endif
+/*********************************************************************************************\
+ * Source: https://en.gassensor.com.cn/CO2Sensor/list.html (pdf for 1106/1107/1109 sensors)
+ *  
+ * 
+ * Automatic Baseline Correction (ABC logic function) is enabled by default but may be disabled with command
+ * Sensor95 0
+ * and enabled again with command
+ * Sensor95 1
+ *
+ * ABC logic function refers to that sensor itself do zero point judgment and automatic calibration procedure
+ * intelligently after a continuous operation period. The automatic calibration cycle is first 24 hours and 7 days cycle after powered on.
+ *
+ * The zero point of automatic calibration is 400ppm.
+ *
+ * This function is usually suitable for indoor air quality monitor such as offices, schools and homes,
+ * not suitable for greenhouse, farm and refrigeratory where this function should be off.
+ *
+ * Please do zero calibration timely, such as manual or command calibration.
+\*********************************************************************************************/
+
+#include <TasmotaSerial.h>
+
+#ifndef CO2_LOW
+#define CO2_LOW                      800     // Below this CO2 value show green light
+#endif
+#ifndef CO2_HIGH
+#define CO2_HIGH                     1200    // Above this CO2 value show red light
+#endif
+
+#define CM1107_READ_TIMEOUT           400     // Must be way less than 1000 but enough to read 16 bytes at 9600 bps
+#define CM1107_RETRY_COUNT            8
+
+TasmotaSerial *CM11Serial;
+
+
+const char CM11_ABC_ENABLED[] = "ABC is Enabled";
+const char CM11_ABC_DISABLED[] = "ABC is Disabled";
+
+//First [0] element - lenght of cmd and data
+const uint8_t cmd_read[] = {0x01,0x01};   // cm11_cmnd_read_ppm
+uint8_t cmd_abc_enable[] =  {0x07,0x10,0x64,0x00,0x07,0x01,0x90,0x64};   // cm11_cmnd_abc_enable. Not const because can be modified
+const uint8_t cmd_abc_disable[] = {0x07,0x10,0x64,0x02,0x07,0x01,0x90,0x64};   // cm11_cmnd_abc_disable
+const uint8_t cmd_zeropoint[] = {0x03,0x03,0x01,0x90};   // cm11_cmnd_zeropoint_400
+const uint8_t cmd_serial[] = {0x01,0x1F};   // cm11_cmnd_read_serial
+const uint8_t cmd_sw_version[] = {0x01,0x1E};  // cm11_cmnd_read_sw_version
+
+
+enum CM11Commands { CM11_CMND_READPPM, CM11_CMND_ABCENABLE, CM11_CMND_ABCDISABLE, CM11_CMND_ZEROPOINT, CM11_CMND_SERIAL,CM11_CMND_SW_VERSION };
+const uint8_t* kCM11Commands[] PROGMEM = {
+  cmd_read,
+  cmd_abc_enable,
+  cmd_abc_disable,
+  cmd_zeropoint,
+  cmd_serial,
+  cmd_sw_version
+};
+
+
+uint8_t cm11_type = 1;
+uint16_t cm11_last_ppm = 0;
+uint8_t cm11_filter = CM1107_FILTER_OPTION;
+bool cm11_abc_must_apply = false;
+
+float cm11_temperature = 0;
+uint16_t cm11_humidity = 0;
+char cm11_sw_version[30] = {0};
+char cm11_serial_number[21] = {0};
+uint8_t cm11_retry = CM1107_RETRY_COUNT;
+uint8_t cm11_received = 0;
+uint8_t cm11_state = 0;
+uint16_t ppm_low_limit = 0;
+uint16_t ppm_high_limit = 5000;
+
+/*********************************************************************************************/
+//256-(HEAD+LEN+CMD+DATA)%256
+uint8_t CM11CalculateChecksum(uint8_t *array,uint8_t start, uint8_t len)
+{
+  uint8_t checksum = 0;
+  for (uint8_t i = start; i < len; i++) {
+    checksum += array[i];
+  }
+  checksum = checksum%256;
+  checksum = 255 - checksum;
+  return (checksum +1);
+}
+
+size_t CM11SendCmd(uint8_t command_id)
+{
+  uint8_t len =kCM11Commands[command_id][0];
+  uint8_t cm11_send[len+3];// = {0}; //Fix length
+  memset( cm11_send, 0, (len+3)*sizeof(uint8_t) );
+
+  cm11_send[0] = 0x11;  // Start byte, fixed
+
+  memcpy_P(&cm11_send[1], kCM11Commands[command_id], (len+1) * sizeof(uint8_t));
+
+  cm11_send[len+2] = CM11CalculateChecksum(cm11_send,0, len+2);
+  
+#ifdef DEBUG_TASMOTA_SENSOR
+  char cmdFull[len+30];// = {0};
+  memset( cmdFull, 0, (len+3)*sizeof(char) );
+  for(int i=0, j=0;i<len+3;i=i+1, j=j+3)
+  {
+    sprintf(&cmdFull[j],"%02x ", cm11_send[i]);
+  }
+  AddLog(LOG_LEVEL_DEBUG, PSTR("Final CM11Command: %s"),cmdFull);
+#endif  // DEBUG_TASMOTA_SENSOR
+  cm11_received = 0;
+  cm11_state = 0;
+  return CM11Serial->write(cm11_send, sizeof(cm11_send));
+}
+
+/*********************************************************************************************/
+
+bool CM11CheckAndApplyFilter(uint16_t ppm, uint8_t drift)
+{
+#ifdef DEBUG_TASMOTA_SENSOR
+  AddLog(LOG_LEVEL_DEBUG, PSTR(D_LOG_DEBUG "CM11 ppm: %u, last ppm: %u"),ppm, cm11_last_ppm);
+#endif //DEBUG_TASMOTA_SENSOR
+  if (cm11_last_ppm < ppm_low_limit || cm11_last_ppm > ppm_high_limit) {
+    // Prevent unrealistic values during start-up with filtering enabled.
+    // Just assume the entered value is correct.
+    cm11_last_ppm = ppm;
+    return true;
+  }
+  int32_t difference = ppm - cm11_last_ppm;
+  if (drift > 0  && cm11_filter != CM1107_FILTER_OFF) {
+    difference >>= CM1107_FILTER_SLOW; // If drifting values -> apply slow filter
+  }else if (CM1107_FILTER_OFF == cm11_filter) {
+    if (drift != 0 ) {
+      return false; //Do not alarm on such unstable values
+    }
+   }else {
+    difference >>=cm11_filter;
+  }
+  
+  AddLog(LOG_LEVEL_DEBUG, PSTR(D_LOG_DEBUG "CM11 diff: %d"),difference);
+  cm11_last_ppm = static_cast<uint16_t>(cm11_last_ppm + difference);
+  return true;
+}
+
+void CM11EverySecond(void)
+{
+  cm11_state++;
+  //If more than one command was send
+  //Reading preffered
+  if (CM11Serial->available() > 0){
+    cm11_received = 0;
+  }
+
+  if ((8 == cm11_state && cm11_received) || 16 == cm11_state) {                   // Every 8 sec start a CM11 measuring cycle (which takes 1005 +5% ms)
+    cm11_state = 0;
+
+    if (cm11_retry) {
+      cm11_retry--;
+      if (!cm11_retry) {
+        cm11_last_ppm = 0;
+        cm11_temperature = 0;
+        cm11_humidity = 0;
+      }
+    }
+
+    CM11Serial->flush();                    // Sync reception
+    CM11SendCmd(CM11_CMND_READPPM);
+    cm11_received = 0;
+  }
+
+  if ((cm11_state > 2) && !cm11_received) {  // Start reading response after 3 seconds every second until received
+    uint8_t cm11_response[50];
+    unsigned long start = millis();
+    uint8_t counter = 0;
+    uint8_t resp_len = 50;
+    while (((millis() - start) < CM1107_READ_TIMEOUT) && (counter < resp_len)) {
+      if (CM11Serial->available() > 0) {
+        cm11_response[counter++] = CM11Serial->read();
+        if (counter ==2 && cm11_response[0] == 0x16) { //0x16 - first byte in response
+          resp_len = cm11_response[1] +3 ; // Get expected response len (according protocol desc), +3 - first byte, len and checksum
+        }
+      } else {
+        delay(5);
+      }
+    }
+
+    if (counter < 5) {
+      AddLog(LOG_LEVEL_DEBUG, PSTR(D_LOG_DEBUG "CM1107 timeout (command sent, no responce"));
+      return;
+    }
+
+    uint8_t crc = CM11CalculateChecksum(cm11_response,0, cm11_response[1]+2);
+    if (cm11_response[cm11_response[1]+2] != crc) {
+      AddLog(LOG_LEVEL_DEBUG, PSTR(D_LOG_DEBUG "CM1107 crc error"));
+      return;
+    }
+    if (0x16 != cm11_response[0]) {
+      AddLog(LOG_LEVEL_DEBUG, PSTR(D_LOG_DEBUG "CM1107 bad response"));
+      return;
+    }
+
+    cm11_received = 1;
+
+    if (cm11_response[2]==cmd_read[1]){  //0x01 - read command
+      uint16_t ppm = (cm11_response[3] << 8) | cm11_response[4];
+      AddLog(LOG_LEVEL_DEBUG, PSTR(D_LOG_DEBUG "CM11 PPM: %u"),ppm);
+      if (ppm ==550) { // Preheating mode, fixed value. 
+      //DOCs says that preheating is cm11_response[5] & (1 << 0)) ==1 (first bit ==1), but mine sensor (CM1107, sw V1.07.0.02 )
+      // set first bit 0 when preheating at switch to 1 then finished.
+        AddLog(LOG_LEVEL_DEBUG, PSTR(D_LOG_DEBUG "CM11 preheating"));
+        if (Settings->SensorBits1.mhz19b_abc_disable) {
+          // After bootup of the sensor the ABC will be enabled.
+          // Thus only actively disable after bootup.
+          cm11_abc_must_apply = true;
+      }
+        return;
+      }
+      if(cm11_response[1] ==13) { // CM1107T with temperature and humidity
+        cm11_temperature = (float)(((cm11_response[7] << 8) | cm11_response[8]) - 4685)/100.0f;
+        cm11_humidity =  (((cm11_response[9] << 8) | cm11_response[10]) - 600)/100;
+        cm11_type = 2;
+      }
+      uint8_t cm11_drift = (cm11_response[5] & (1 << 7)) ? 1:0;
+      AddLog(LOG_LEVEL_DEBUG, PSTR(D_LOG_DEBUG "CM11 flags DF3: %02x"),cm11_response[5]);
+
+      if (CM11CheckAndApplyFilter(ppm,cm11_drift)) {
+        cm11_retry = CM1107_RETRY_COUNT;
+#ifdef USE_LIGHT
+        LightSetSignal(CO2_LOW, CO2_HIGH, cm11_last_ppm);
+#endif  // USE_LIGHT
+
+        if (!cm11_drift) {  // Measuring is stable.
+          if (cm11_abc_must_apply) {
+            cm11_abc_must_apply = false;
+            if (!Settings->SensorBits1.mhz19b_abc_disable) {
+              CM11SendCmd(CM11_CMND_ABCENABLE);
+            } else {
+              CM11SendCmd(CM11_CMND_ABCDISABLE);
+            }
+          }
+        }
+
+      }
+    }
+
+    if (cm11_response[2]==cmd_sw_version[1]){  //0x1E - read SW version
+      memcpy_P(cm11_sw_version, &cm11_response[3], cm11_response[1] * sizeof(uint8_t));
+      AddLog(LOG_LEVEL_INFO, PSTR(D_LOG_DEBUG "SW version: %s"),cm11_sw_version);
+    }
+
+    if (cm11_response[2]==cmd_serial[1]){  //0x1F - read serial
+    // Serial num coded as 5 integers 0..9999. Each integer is uint16_t size
+      for (uint8_t i=0; i<cm11_response[1]-1;i=i+2){ //for each 2 uint8_t
+        uint16_t v = (cm11_response[3+i] <<8) | cm11_response[3+i+1]; // get int value
+        sprintf_P(cm11_serial_number+i*2,"%04u", v); //print int value to result str
+      }
+      AddLog(LOG_LEVEL_INFO, PSTR(D_LOG_DEBUG "Serial number: %s"),cm11_serial_number);
+    }   
+
+  }
+}
+
+/*********************************************************************************************\
+ * Command Sensor15
+ *
+ * 0    - ABC Off
+ * 1    - ABC On (Default)
+ * 2    - Manual start = ABC Off (set zero point)
+ * 3    - Get SW version
+ * 4    - Get serial
+ * 5    - Set limits
+ * 6    - Set filter mode
+\*********************************************************************************************/
+
+
+bool CM11CommandSensor(void)
+{
+  bool serviced = true;
+
+  switch (XdrvMailbox.payload) {
+    case 0:
+      Settings->SensorBits1.mhz19b_abc_disable = true;
+      CM11SendCmd(CM11_CMND_ABCDISABLE);
+      Response_P(S_JSON_SENSOR_INDEX_SVALUE, XSNS_95, CM11_ABC_DISABLED);
+      break;
+    case 1:
+      Settings->SensorBits1.mhz19b_abc_disable = false;
+      CM11SendCmd(CM11_CMND_ABCENABLE);
+      Response_P(S_JSON_SENSOR_INDEX_SVALUE, XSNS_95, CM11_ABC_ENABLED);
+      break;
+    case 2:
+      CM11SendCmd(CM11_CMND_ZEROPOINT); 
+      Response_P(S_JSON_SENSOR_INDEX_SVALUE, XSNS_95, D_JSON_ZERO_POINT_CALIBRATION);
+      break;
+    case 3:
+      CM11SendCmd(CM11_CMND_SW_VERSION);
+      Response_P(S_JSON_SENSOR_INDEX_SVALUE, XSNS_95, "CM11 sw version");
+      break;
+    case 4:
+      CM11SendCmd(CM11_CMND_SERIAL);
+      Response_P(S_JSON_SENSOR_INDEX_SVALUE, XSNS_95, "CM11 serial number");
+      break;
+
+    default:
+     // Set ppm limits: 5,<low_limit>,<high_limit>
+     // ABS period cmd(with enabling ABS): 1,[1..30]
+      uint32_t parm[3] = { 0 };
+      ParseParameters(3, parm);
+      switch (parm[0]) {
+        case 1:
+          if (parm[1]>=1 && parm[1]<=30){
+            cmd_abc_enable[4] = parm[1]; //set uint8 from uint32 *o*, but value limited by 30
+            Settings->SensorBits1.mhz19b_abc_disable = false;
+            CM11SendCmd(CM11_CMND_ABCENABLE);
+            Response_P(S_JSON_SENSOR_INDEX_SVALUE, XSNS_95, CM11_ABC_ENABLED);
+          } else {
+            Response_P(S_JSON_SENSOR_INDEX_SVALUE, XSNS_95, "Valid period value: [1..30]");
+          }
+          break;
+        // Set sensor ppm limit. Default 0..5000, but some sensors has another range.
+        case 5:
+          if(parm[1]>=0 && parm[1] <=10000 && parm[2]>=0 && parm[2] <=10000 && parm[1]<parm[2]) {
+            ppm_low_limit = parm[1];
+            ppm_high_limit = parm[2];
+          }else{
+            Response_P(S_JSON_SENSOR_INDEX_SVALUE, XSNS_95, "Invalid PPM limits: [0..10000]");
+          }
+          break;
+        // Set filter mode
+        case 6:
+          if (parm[1] >=0 && parm[1]<=4) {
+            cm11_filter = parm[1];
+            Response_P(S_JSON_SENSOR_INDEX_SVALUE, XSNS_95, "CM11 set filter mode");
+          }
+          else {
+            Response_P(S_JSON_SENSOR_INDEX_SVALUE, XSNS_95, "Invalid filter mode: [0..4]. 0 - Off, 1 (Fast) -> 4 (Slow)");
+          }
+          break;
+        default:
+          Response_P(S_JSON_SENSOR_INDEX_SVALUE, XSNS_95, "Unknown command");
+          break;
+      }
+
+  }
+
+  return serviced;
+}
+
+/*********************************************************************************************/
+
+void CM11Init(void)
+{
+  cm11_type = 0;
+  if (PinUsed(GPIO_CM11_RXD) && PinUsed(GPIO_CM11_TXD)) {
+    CM11Serial = new TasmotaSerial(Pin(GPIO_CM11_RXD), Pin(GPIO_CM11_TXD), 1);
+    if (CM11Serial->begin(9600)) {
+      if (CM11Serial->hardwareSerial()) { ClaimSerial(); }
+      cm11_type = 1;
+      CM11SendCmd(CM11_CMND_SW_VERSION);
+    }
+  }
+}
+
+void CM11Show(bool json)
+{
+  if (json) {
+    ResponseAppend_P(PSTR(",\"CM11\":{\"" D_JSON_CO2 "\":%d,\"" D_JSON_VERSION "\":\"%s\",\"Serial number\":\"%s\""),
+      cm11_last_ppm, cm11_sw_version, cm11_serial_number);
+    if(cm11_type == 2) { // With temp and humidity
+      ResponseAppend_P(PSTR(",\"" D_JSON_TEMPERATURE "\":%*_f"),
+       Settings->flag2.temperature_resolution, &cm11_temperature);
+    }
+    ResponseAppend_P(PSTR("}"));
+#ifdef USE_DOMOTICZ
+    if (0 == TasmotaGlobal.tele_period) {
+      DomoticzSensor(DZ_AIRQUALITY, cm11_last_ppm);
+      if(cm11_type == 2) { // With temp and humidity
+        DomoticzFloatSensor(DZ_TEMP, cm11_temperature);
+      }
+    }
+#endif  // USE_DOMOTICZ
+#ifdef USE_WEBSERVER
+  } else {
+    WSContentSend_PD(HTTP_SNS_CO2, "CM11", cm11_last_ppm);
+    if(cm11_type == 2) { // With temp and humidity
+      WSContentSend_Temp("CM11", cm11_temperature);
+    }
+#endif  // USE_WEBSERVER
+  }
+}
+
+/*********************************************************************************************\
+ * Interface
+\*********************************************************************************************/
+
+bool Xsns95(uint8_t function)
+{
+  bool result = false;
+
+  if (cm11_type) {
+    switch (function) {
+      case FUNC_INIT:
+        CM11Init();
+        break;
+      case FUNC_EVERY_SECOND:
+        CM11EverySecond();
+        break;
+      case FUNC_COMMAND_SENSOR:
+        if (XSNS_95 == XdrvMailbox.index) {
+          result = CM11CommandSensor();
+        }
+        break;
+      case FUNC_JSON_APPEND:
+        CM11Show(1);
+        break;
+#ifdef USE_WEBSERVER
+      case FUNC_WEB_SENSOR:
+        CM11Show(0);
+        break;
+#endif  // USE_WEBSERVER
+    }
+  }
+  return result;
+}
+
+#endif  // USE_CM110x
diff --git a/tools/lv_gpio/lv_gpio_enum.h b/tools/lv_gpio/lv_gpio_enum.h
index 74f6c64f3..51e83ae7e 100644
--- a/tools/lv_gpio/lv_gpio_enum.h
+++ b/tools/lv_gpio/lv_gpio_enum.h
@@ -63,6 +63,8 @@ DSB_OUT = GPIO_DSB_OUT
 WS2812 = GPIO_WS2812
 MHZ_TXD = GPIO_MHZ_TXD
 MHZ_RXD = GPIO_MHZ_RXD
+CM11_TXD = GPIO_CM11_TXD
+CM11_RXD = GPIO_CM11_RXD
 PZEM0XX_TX = GPIO_PZEM0XX_TX
 PZEM004_RX = GPIO_PZEM004_RX
 PZEM016_RX = GPIO_PZEM016_RX