diff --git a/tasmota/xsns_06_dht_v3.ino b/tasmota/xsns_06_dht_v3.ino
index c777f732ed42..8b30cee7f2d1 100644
--- a/tasmota/xsns_06_dht_v3.ino
+++ b/tasmota/xsns_06_dht_v3.ino
@@ -17,7 +17,7 @@
along with this program. If not, see .
*/
-#ifdef USE_DHT
+#ifdef USE_DHT_V3
/*********************************************************************************************\
* DHT11, AM2301 (DHT21, DHT22, AM2302, AM2321), SI7021 - Temperature and Humidy
*
diff --git a/tasmota/xsns_06_dht_v4.ino b/tasmota/xsns_06_dht_v4.ino
new file mode 100644
index 000000000000..d69d1e20f278
--- /dev/null
+++ b/tasmota/xsns_06_dht_v4.ino
@@ -0,0 +1,291 @@
+/*
+ xsns_06_dht.ino - DHTxx, AM23xx and SI7021 temperature and humidity sensor support for Tasmota
+
+ Copyright (C) 2020 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_DHT
+/*********************************************************************************************\
+ * DHT11, AM2301 (DHT21, DHT22, AM2302, AM2321), SI7021 - Temperature and Humidy
+ *
+ * Reading temperature or humidity takes about 250 milliseconds!
+ * Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
+ *
+ * This version is based on ESPEasy _P005_DHT.ino 20191201 and stripped
+\*********************************************************************************************/
+
+#define XSNS_06 6
+
+#define DHT_MAX_SENSORS 4
+#define DHT_MAX_RETRY 8
+
+uint8_t dht_data[5];
+uint8_t dht_sensors = 0;
+uint8_t dht_pin_out = 0; // Shelly GPIO00 output only
+bool dht_active = true; // DHT configured
+bool dht_dual_mode = false; // Single pin mode
+
+struct DHTSTRUCT {
+ uint8_t pin;
+ uint8_t type;
+ char stype[12];
+ uint32_t lastreadtime;
+ uint8_t lastresult;
+ float t = NAN;
+ float h = NAN;
+} Dht[DHT_MAX_SENSORS];
+
+bool DhtExpectPulse(uint32_t sensor, uint32_t level)
+{
+ unsigned long timeout = micros() + 100;
+ while (digitalRead(Dht[sensor].pin) != level) {
+ if (micros() > timeout) { return false; }
+ delayMicroseconds(1);
+ }
+ return true;
+}
+
+bool DhtRead(uint32_t sensor)
+{
+ dht_data[0] = dht_data[1] = dht_data[2] = dht_data[3] = dht_data[4] = 0;
+
+ if (!dht_dual_mode) {
+ pinMode(Dht[sensor].pin, OUTPUT);
+ digitalWrite(Dht[sensor].pin, LOW);
+ } else {
+ digitalWrite(dht_pin_out, LOW);
+ }
+
+ switch (Dht[sensor].type) {
+ case GPIO_DHT11: // DHT11
+ delay(19); // minimum 18ms
+ break;
+ case GPIO_DHT22: // DHT21, DHT22, AM2301, AM2302, AM2321
+ delay(2); // minimum 1ms
+ break;
+ case GPIO_SI7021: // iTead SI7021
+ delayMicroseconds(500);
+ break;
+ }
+
+ if (!dht_dual_mode) {
+ pinMode(Dht[sensor].pin, INPUT_PULLUP);
+ } else {
+ digitalWrite(dht_pin_out, HIGH);
+ }
+
+ switch (Dht[sensor].type) {
+ case GPIO_DHT11: // DHT11
+ case GPIO_DHT22: // DHT21, DHT22, AM2301, AM2302, AM2321
+ delayMicroseconds(50);
+ break;
+ case GPIO_SI7021: // iTead SI7021
+ delayMicroseconds(20); // See: https://github.com/letscontrolit/ESPEasy/issues/1798
+ break;
+ }
+
+ uint32_t level = 9;
+ noInterrupts();
+ for (uint32_t i = 0; i < 3; i++) {
+ level = i &1;
+ if (!DhtExpectPulse(sensor, level)) { break; } // Expect LOW, HIGH, LOW
+ level = 9;
+ }
+ if (9 == level) {
+ int data = 0;
+ for (uint32_t i = 0; i < 5; i++) {
+ data = 0;
+ for (uint32_t j = 0; j < 8; j++) {
+ level = 1;
+ if (!DhtExpectPulse(sensor, level)) { break; } // Expect HIGH
+
+ delayMicroseconds(35); // Was 30
+ if (digitalRead(Dht[sensor].pin)) {
+ data |= (1 << (7 - j));
+ }
+
+ level = 0;
+ if (!DhtExpectPulse(sensor, level)) { break; } // Expect LOW
+ level = 9;
+ }
+ if (level < 2) { break; }
+
+ dht_data[i] = data;
+ }
+ }
+ interrupts();
+ if (level < 2) {
+ AddLog_P2(LOG_LEVEL_DEBUG, PSTR(D_LOG_DHT D_TIMEOUT_WAITING_FOR " %s " D_PULSE), (0 == level) ? D_START_SIGNAL_LOW : D_START_SIGNAL_HIGH);
+ return false;
+ }
+
+ uint8_t checksum = (dht_data[0] + dht_data[1] + dht_data[2] + dht_data[3]) & 0xFF;
+ if (dht_data[4] != checksum) {
+ char hex_char[15];
+ AddLog_P2(LOG_LEVEL_DEBUG, PSTR(D_LOG_DHT D_CHECKSUM_FAILURE " %s =? %02X"),
+ ToHex_P(dht_data, 5, hex_char, sizeof(hex_char), ' '), checksum);
+ return false;
+ }
+
+ return true;
+}
+
+void DhtReadTempHum(uint32_t sensor)
+{
+ if ((NAN == Dht[sensor].h) || (Dht[sensor].lastresult > DHT_MAX_RETRY)) { // Reset after 8 misses
+ Dht[sensor].t = NAN;
+ Dht[sensor].h = NAN;
+ }
+ if (DhtRead(sensor)) {
+ switch (Dht[sensor].type) {
+ case GPIO_DHT11:
+ Dht[sensor].h = dht_data[0];
+ Dht[sensor].t = dht_data[2] + ((float)dht_data[3] * 0.1f); // Issue #3164
+ break;
+ case GPIO_DHT22:
+ case GPIO_SI7021:
+ Dht[sensor].h = ((dht_data[0] << 8) | dht_data[1]) * 0.1;
+ Dht[sensor].t = (((dht_data[2] & 0x7F) << 8 ) | dht_data[3]) * 0.1;
+ if (dht_data[2] & 0x80) {
+ Dht[sensor].t *= -1;
+ }
+ break;
+ }
+ Dht[sensor].t = ConvertTemp(Dht[sensor].t);
+ Dht[sensor].h = ConvertHumidity(Dht[sensor].h);
+ Dht[sensor].lastresult = 0;
+ } else {
+ Dht[sensor].lastresult++;
+ }
+}
+
+/********************************************************************************************/
+
+bool DhtPinState()
+{
+ if ((XdrvMailbox.index >= GPIO_DHT11) && (XdrvMailbox.index <= GPIO_SI7021)) {
+ if (dht_sensors < DHT_MAX_SENSORS) {
+ Dht[dht_sensors].pin = XdrvMailbox.payload;
+ Dht[dht_sensors].type = XdrvMailbox.index;
+ dht_sensors++;
+ XdrvMailbox.index = GPIO_DHT11;
+ } else {
+ XdrvMailbox.index = 0;
+ }
+ return true;
+ }
+ return false;
+}
+
+void DhtInit(void)
+{
+ if (dht_sensors) {
+ if (pin[GPIO_DHT11_OUT] < 99) {
+ dht_pin_out = pin[GPIO_DHT11_OUT];
+ dht_dual_mode = true; // Dual pins mode as used by Shelly
+ dht_sensors = 1; // We only support one sensor in pseudo mode
+ pinMode(dht_pin_out, OUTPUT);
+ }
+
+ for (uint32_t i = 0; i < dht_sensors; i++) {
+ pinMode(Dht[i].pin, INPUT_PULLUP);
+ Dht[i].lastreadtime = 0;
+ Dht[i].lastresult = 0;
+ GetTextIndexed(Dht[i].stype, sizeof(Dht[i].stype), Dht[i].type, kSensorNames);
+ if (dht_sensors > 1) {
+ snprintf_P(Dht[i].stype, sizeof(Dht[i].stype), PSTR("%s%c%02d"), Dht[i].stype, IndexSeparator(), Dht[i].pin);
+ }
+ }
+ AddLog_P2(LOG_LEVEL_DEBUG, PSTR(D_LOG_DHT "(v4) " D_SENSORS_FOUND " %d"), dht_sensors);
+ } else {
+ dht_active = false;
+ }
+}
+
+void DhtEverySecond(void)
+{
+ if (uptime &1) {
+ } else {
+ for (uint32_t i = 0; i < dht_sensors; i++) {
+ // DHT11 and AM2301 25mS per sensor, SI7021 5mS per sensor
+ DhtReadTempHum(i);
+ }
+ }
+}
+
+void DhtShow(bool json)
+{
+ for (uint32_t i = 0; i < dht_sensors; i++) {
+ char temperature[33];
+ dtostrfd(Dht[i].t, Settings.flag2.temperature_resolution, temperature);
+ char humidity[33];
+ dtostrfd(Dht[i].h, Settings.flag2.humidity_resolution, humidity);
+
+ if (json) {
+ ResponseAppend_P(JSON_SNS_TEMPHUM, Dht[i].stype, temperature, humidity);
+#ifdef USE_DOMOTICZ
+ if ((0 == tele_period) && (0 == i)) {
+ DomoticzTempHumSensor(temperature, humidity);
+ }
+#endif // USE_DOMOTICZ
+#ifdef USE_KNX
+ if ((0 == tele_period) && (0 == i)) {
+ KnxSensor(KNX_TEMPERATURE, Dht[i].t);
+ KnxSensor(KNX_HUMIDITY, Dht[i].h);
+ }
+#endif // USE_KNX
+#ifdef USE_WEBSERVER
+ } else {
+ WSContentSend_PD(HTTP_SNS_TEMP, Dht[i].stype, temperature, TempUnit());
+ WSContentSend_PD(HTTP_SNS_HUM, Dht[i].stype, humidity);
+#endif // USE_WEBSERVER
+ }
+ }
+}
+
+/*********************************************************************************************\
+ * Interface
+\*********************************************************************************************/
+
+bool Xsns06(uint8_t function)
+{
+ bool result = false;
+
+ if (dht_active) {
+ switch (function) {
+ case FUNC_EVERY_SECOND:
+ DhtEverySecond();
+ break;
+ case FUNC_JSON_APPEND:
+ DhtShow(1);
+ break;
+#ifdef USE_WEBSERVER
+ case FUNC_WEB_SENSOR:
+ DhtShow(0);
+ break;
+#endif // USE_WEBSERVER
+ case FUNC_INIT:
+ DhtInit();
+ break;
+ case FUNC_PIN_STATE:
+ result = DhtPinState();
+ break;
+ }
+ }
+ return result;
+}
+
+#endif // USE_DHT