diff --git a/I2CDEVICES.md b/I2CDEVICES.md
index 75c0a1a9a..9eea5f2bc 100644
--- a/I2CDEVICES.md
+++ b/I2CDEVICES.md
@@ -67,3 +67,4 @@ Index | Define | Driver | Device | Address(es) | Description
43 | USE_AHT1x | xsns_63 | AHT10/15 | 0x38 | Temperature and humidity sensor
44 | USE_WEMOS_MOTOR_V1 | xdrv_34 | | 0x2D - 0x30 | WEMOS motor shield v1.0.0 (6612FNG)
45 | USE_HDC1080 | xsns_65 | HDC1080 | 0x40 | Temperature and Humidity sensor
+ 46 | USE_IAQ | xsns_66 | IAQ | 0x5a | Air quality sensor
diff --git a/tasmota/my_user_config.h b/tasmota/my_user_config.h
index 1226b55fe..50c2387ad 100644
--- a/tasmota/my_user_config.h
+++ b/tasmota/my_user_config.h
@@ -499,6 +499,7 @@
// #define WEMOS_MOTOR_V1_ADDR 0x30 // Default I2C address 0x30
// #define WEMOS_MOTOR_V1_FREQ 1000 // Default frequency
// #define USE_HDC1080 // [I2cDriver45] Enable HDC1080 temperature/humidity sensor (I2C address 0x40) (+1k5 code)
+ #define USE_IAQ // [I2cDriver46] Enable iAQ-core air quality sensor (I2C address 0x5a) (+0k6 code)
// #define USE_DISPLAY // Add I2C Display Support (+2k code)
#define USE_DISPLAY_MODES1TO5 // Enable display mode 1 to 5 in addition to mode 0
diff --git a/tasmota/support_features.ino b/tasmota/support_features.ino
index 201711e48..7b094d534 100644
--- a/tasmota/support_features.ino
+++ b/tasmota/support_features.ino
@@ -542,8 +542,10 @@ void GetFeatures(void)
#ifdef USE_HDC1080
feature6 |= 0x00000008; // xsns_65_hdc1080.ino
#endif
+#ifdef USE_IAQ
+ feature6 |= 0x00000010; // xsns_66_iAQ.ino
+#endif
-// feature6 |= 0x00000010;
// feature6 |= 0x00000020;
// feature6 |= 0x00000040;
// feature6 |= 0x00000080;
diff --git a/tasmota/xsns_66_iAQ.ino b/tasmota/xsns_66_iAQ.ino
new file mode 100644
index 000000000..d115d0965
--- /dev/null
+++ b/tasmota/xsns_66_iAQ.ino
@@ -0,0 +1,137 @@
+/*
+ xsns_66_iAQ.ino - Support for iAQ-Core - Indoor Air Quality Sensor Module
+
+ Copyright (C) 2020 Christian Baars and 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 .
+*/
+
+#ifdef USE_I2C
+#ifdef USE_IAQ
+
+#define XSNS_66 66
+#define XI2C_46 46 // See I2CDEVICES.md
+
+#define I2_ADR_IAQ 0x5a // collides with MLX90614 and maybe others
+
+#define IAQ_STATUS_OK 0x00
+#define IAQ_STATUS_BUSY 0x01
+#define IAQ_STATUS_WARM 0x10
+#define IAQ_STATUS_ERR 0x80
+#define IAQ_STATUS_I2C_ERR 0xFF
+
+struct {
+ int32_t resistance;
+ uint16_t pred;
+ uint16_t Tvoc;
+ uint8_t status;
+ bool ready;
+} iAQ;
+
+void IAQ_Init(void)
+{
+ if (!I2cSetDevice(I2_ADR_IAQ)) { return; }
+ I2cSetActiveFound(I2_ADR_IAQ, "IAQ");
+ iAQ.ready = true;
+}
+
+void IAQ_Read(void)
+{
+ uint8_t buf[9];
+ buf[2] = IAQ_STATUS_I2C_ERR; // populate entry with error code
+ Wire.requestFrom((uint8_t)I2_ADR_IAQ,sizeof(buf));
+ for( uint32_t i=0; i<9; i++ ) {
+ buf[i]= Wire.read();
+ }
+ // AddLog_P2(LOG_LEVEL_DEBUG, "iAQ: buffer %x %x %x %x %x %x %x %x %x ", buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7], buf[8]);
+ iAQ.pred = (buf[0]<<8) + buf[1];
+ iAQ.status = buf[2];
+ iAQ.resistance = ((uint32_t)buf[3]<<24) + ((uint32_t)buf[4]<<16) + ((uint32_t)buf[5]<<8) + (uint32_t)buf[6];
+ iAQ.Tvoc = (buf[7]<<8) + buf[8];
+}
+
+/*********************************************************************************************\
+ * Presentation
+\*********************************************************************************************/
+
+#ifdef USE_WEBSERVER
+const char HTTP_SNS_IAQ[] PROGMEM =
+ "{s}iAQ-Core " D_ECO2 "{m}%d " D_UNIT_PARTS_PER_MILLION "{e}" // {s} = | , {m} = | , {e} = |
|---|
+ "{s}iAQ-Core " D_TVOC "{m}%d " D_UNIT_PARTS_PER_BILLION "{e}";
+
+const char HTTP_SNS_IAQ_ERROR[] PROGMEM =
+ "{s}iAQ-Core {m} %s {e}";
+#endif
+
+void IAQ_Show(uint8_t json)
+{
+ IAQ_Read();
+
+ if (json) {
+ if (iAQ.status!=IAQ_STATUS_OK){
+ AddLog_P2(LOG_LEVEL_INFO, PSTR("iAQ: " D_ERROR " %x" ),iAQ.status);
+ return;
+ }
+ else {
+ ResponseAppend_P(PSTR(",\"IAQ\":{\"" D_JSON_ECO2 "\":%u,\"" D_JSON_TVOC "\":%u,\"" D_JSON_RESISTANCE "\":%u}"), iAQ.pred, iAQ.Tvoc, iAQ.resistance);
+#ifdef USE_DOMOTICZ
+ if (0 == tele_period) DomoticzSensor(DZ_AIRQUALITY, iAQ.pred);
+#endif // USE_DOMOTICZ
+ }
+#ifdef USE_WEBSERVER
+ } else {
+ switch(iAQ.status){
+ case IAQ_STATUS_OK:
+ WSContentSend_PD(HTTP_SNS_IAQ, iAQ.pred, iAQ.Tvoc);
+ break;
+ case IAQ_STATUS_WARM:
+ WSContentSend_PD(HTTP_SNS_IAQ_ERROR, D_START);
+ break;
+ default:
+ WSContentSend_PD(HTTP_SNS_IAQ_ERROR, D_ERROR);
+ }
+#endif
+ }
+}
+
+/*********************************************************************************************\
+ * Interface
+\*********************************************************************************************/
+
+bool Xsns66(byte function)
+{
+ if (!I2cEnabled(XI2C_46)) { return false; }
+
+ bool result = false;
+
+ if (FUNC_INIT == function) {
+ IAQ_Init();
+ }
+ else if (iAQ.ready) {
+ switch (function) {
+ case FUNC_JSON_APPEND:
+ IAQ_Show(1);
+ break;
+#ifdef USE_WEBSERVER
+ case FUNC_WEB_SENSOR:
+ IAQ_Show(0);
+ break;
+#endif // USE_WEBSERVER
+ }
+ }
+ return result;
+}
+
+#endif // USE_IAQ
+#endif // USE_I2C
\ No newline at end of file
diff --git a/tools/decode-status.py b/tools/decode-status.py
index 25af64a97..d1d361d29 100755
--- a/tools/decode-status.py
+++ b/tools/decode-status.py
@@ -199,7 +199,7 @@ a_features = [[
"USE_AHT1x","USE_WEMOS_MOTOR_V1","USE_DEVICE_GROUPS","USE_PWM_DIMMER"
],[
"USE_KEELOQ","USE_HRXL","USE_SONOFF_D1","USE_HDC1080",
- "","","","",
+ "USE_IAQ","","","",
"","","","",
"","","","",
"","","","",