diff --git a/README.md b/README.md
index 78d6fdd8..c6ff289b 100644
--- a/README.md
+++ b/README.md
@@ -58,7 +58,7 @@ Depending on board hardware following features are supported:
 - Silicon unique ID
 - Battery voltage monitoring
 - GPS (Generic serial NMEA, or Quectel L76 I2C)
-- Environmental sensor (Bosch BMP180/BME280/BME680 I2C)
+- Environmental sensors (Bosch BMP180/BME280/BME680 I2C; SDS011 serial)
 - Real Time Clock (Maxim DS3231 I2C)
 - IF482 (serial) and DCF77 (gpio) time telegram generator
 - Switch external power / battery
@@ -167,7 +167,7 @@ by pressing the button of the device.
 
 # Sensors and Peripherals
 
-You can add up to 3 user defined sensors. Insert sensor's payload scheme in [*sensor.cpp*](src/sensor.cpp). Bosch BMP180 / BME280 / BME680 environment sensors are supported. Enable flag *lib_deps_sensors* for your board in [*platformio.ini*](src/platformio.ini) and configure BME in board's hal file before build. If you need Bosch's proprietary BSEC libraray (e.g. to get indoor air quality value from BME680) further enable *build_flags_sensors*, which comes on the price of reduced RAM and increased build size. RTC DS3231, generic serial NMEA GPS, I2C LoPy GPS are supported, and to be configured in board's hal file. See [*generic.h*](src/hal/generic.h) for all options and for proper configuration of BME280/BME680.
+You can add up to 3 user defined sensors. Insert sensor's payload scheme in [*sensor.cpp*](src/sensor.cpp). Bosch BMP180 / BME280 / BME680 environment sensors are supported. Enable flag *lib_deps_sensors* for your board in [*platformio.ini*](src/platformio.ini) and configure BME in board's hal file before build. If you need Bosch's proprietary BSEC libraray (e.g. to get indoor air quality value from BME680) further enable *build_flags_sensors*, which comes on the price of reduced RAM and increased build size. Furthermore, SDS011, RTC DS3231, generic serial NMEA GPS, I2C LoPy GPS are supported, and to be configured in board's hal file. See [*generic.h*](src/hal/generic.h) for all options and for proper configuration of BME280/BME680.
 
 Output of user sensor data can be switched by user remote control command 0x14 sent to Port 2. 
 
@@ -548,4 +548,4 @@ Thanks to
 - [terrillmoore](https://github.com/mcci-catena) for maintaining the LMIC for arduino LoRaWAN stack
 - [sbamueller](https://github.com/sbamueller) for writing the tutorial in Make Magazine
 - [Stefan](https://github.com/nerdyscout) for paxcounter opensensebox integration
-- [August Quint](https://github.com/AugustQu) for adding SD card data logger support
+- [August Quint](https://github.com/AugustQu) for adding SD card data logger and SDS011 support
diff --git a/include/cyclic.h b/include/cyclic.h
index 4b402360..ccadbb65 100644
--- a/include/cyclic.h
+++ b/include/cyclic.h
@@ -18,6 +18,15 @@
 #include "display.h"
 #endif
 
+#if (HAS_SDS011)
+#include "sds011read.h"
+#endif
+
+#if (HAS_SDCARD)
+#include "sdcard.h"
+#endif
+
+
 extern Ticker housekeeper;
 
 void housekeeping(void);
diff --git a/include/globals.h b/include/globals.h
index a733a7fe..d56998e3 100644
--- a/include/globals.h
+++ b/include/globals.h
@@ -111,6 +111,11 @@ typedef struct {
   float gas;             // raw gas sensor signal
 } bmeStatus_t;
 
+typedef struct {
+  float pm10;
+  float pm25;
+} sdsStatus_t;
+
 extern std::set<uint16_t, std::less<uint16_t>, Mallocator<uint16_t>> macs;
 extern std::array<uint64_t, 0xff>::iterator it;
 extern std::array<uint64_t, 0xff> beacons;
diff --git a/include/payload.h b/include/payload.h
index b41bb113..889c164d 100644
--- a/include/payload.h
+++ b/include/payload.h
@@ -3,6 +3,10 @@
 
 #include "paxcounter.conf"
 
+#if (HAS_SDS011)
+#include "sds011read.h"
+#endif
+
 // MyDevices CayenneLPP 1.0 channels for Synamic sensor payload format
 // all payload goes out on LoRa FPort 1
 #if (PAYLOAD_ENCODER == 3)
@@ -19,6 +23,8 @@
 #define LPP_HUMIDITY_CHANNEL 29
 #define LPP_BAROMETER_CHANNEL 30
 #define LPP_AIR_CHANNEL 31
+#define LPP_PARTMATTER10_CHANNEL 32    // particular matter for PM 10
+#define LPP_PARTMATTER25_CHANNEL 33    // particular matter for PM 2.5
 
 // MyDevices CayenneLPP 2.0 types for Packed Sensor Payload, not using channels,
 // but different FPorts
@@ -55,6 +61,9 @@ public:
   void addButton(uint8_t value);
   void addSensor(uint8_t[]);
   void addTime(time_t value);
+  void addSDS(sdsStatus_t value);
+private:
+  void addChars( char* string, int len);
 
 #if (PAYLOAD_ENCODER == 1) // format plain
 
@@ -95,4 +104,4 @@ private:
 
 extern PayloadConvert payload;
 
-#endif // _PAYLOAD_H_
\ No newline at end of file
+#endif // _PAYLOAD_H_
diff --git a/include/sdcard.h b/include/sdcard.h
index 051baa19..99e784cb 100644
--- a/include/sdcard.h
+++ b/include/sdcard.h
@@ -10,7 +10,7 @@
 #define SDCARD_FILE_NAME       "paxcount.%02d"
 #define SDCARD_FILE_HEADER     "date, time, wifi, bluet"
 
-bool sdcardInit( void );
+bool sdcard_init( void );
 void sdcardWriteData( uint16_t, uint16_t);
 
-#endif
\ No newline at end of file
+#endif
diff --git a/include/sds011read.h b/include/sds011read.h
new file mode 100644
index 00000000..97307d1c
--- /dev/null
+++ b/include/sds011read.h
@@ -0,0 +1,15 @@
+#ifndef _SDS011READ_H
+#define _SDS011READ_H
+
+#include "globals.h"
+#include <SDS011.h>
+
+#define SDCARD_FILE_HEADER_SDS011     ", PM10,PM25"
+
+bool sds011_init();
+void sds011_loop();
+void sds011_sleep(void);
+void sds011_wakeup(void);
+void sds011_store(sdsStatus_t *sds_store);
+
+#endif // _SDS011READ_H
diff --git a/platformio.ini b/platformio.ini
index 0ee61057..69dca5eb 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -73,6 +73,7 @@ lib_deps_sensors =
     Adafruit BME280 Library@>=2.0.0
     Adafruit BMP085 Library@>=1.0.1
     BSEC Software Library@1.5.1474
+    https://github.com/ricki-z/SDS011.git
 lib_deps_basic =
     ArduinoJson@^5.13.1
     76@>=1.2.4 ; #76 Timezone by Jack Christensen
diff --git a/src/cyclic.cpp b/src/cyclic.cpp
index 89f8e3e2..b0223381 100644
--- a/src/cyclic.cpp
+++ b/src/cyclic.cpp
@@ -9,6 +9,10 @@ static const char TAG[] = __FILE__;
 
 Ticker housekeeper;
 
+#if (HAS_SDS011)
+extern boolean isSDS011Active;
+#endif
+
 void housekeeping() {
   xTaskNotifyFromISR(irqHandlerTask, CYCLIC_IRQ, eSetBits, NULL);
 }
@@ -18,7 +22,6 @@ void doHousekeeping() {
 
   // update uptime counter
   uptime();
-
   // check if update mode trigger switch was set
   if (RTC_runmode == RUNMODE_UPDATE) {
     // check battery status if we can before doing ota
@@ -112,6 +115,17 @@ void doHousekeeping() {
   }
 #endif
 
+#if (HAS_SDS011)
+    if ( isSDS011Active ) {
+        ESP_LOGD(TAG, "SDS011: go to sleep");
+        sds011_loop();
+    }
+    else {
+        ESP_LOGD(TAG, "SDS011: wakeup");
+        sds011_wakeup();
+    }
+#endif
+
 } // doHousekeeping()
 
 // uptime counter 64bit to prevent millis() rollover after 49 days
@@ -143,4 +157,4 @@ void reset_counters() {
 #endif
 
 #endif
-}
\ No newline at end of file
+}
diff --git a/src/gpsread.cpp b/src/gpsread.cpp
index b1f6db81..8530bbca 100644
--- a/src/gpsread.cpp
+++ b/src/gpsread.cpp
@@ -10,8 +10,7 @@ static const char TAG[] = __FILE__;
 TinyGPSPlus gps;
 TinyGPSCustom gpstime(gps, "GPZDA", 1); // field 1 = UTC time
 static const String ZDA_Request = "$EIGPQ,ZDA*39\r\n";
-
-gpsStatus_t gps_status = {0};
+static gpsStatus_t gps_status = {0};
 TaskHandle_t GpsTask;
 
 #ifdef GPS_SERIAL
diff --git a/src/hal/generic.h b/src/hal/generic.h
index 5d56e591..b63cea89 100644
--- a/src/hal/generic.h
+++ b/src/hal/generic.h
@@ -48,8 +48,14 @@
 //#define HAS_BMP180
 //#define BMP180_ADDR 0x77
 
+// SDS011 dust sensor settings
+#define HAS_SDS011 1 // use SDS011
+// used pins on the ESP-side:
+#define SDS_TX 19     // connect to RX on the SDS011
+#define SDS_RX 23     // connect to TX on the SDS011
+
 // user defined sensors
-//#define HAS_SENSORS 1 // comment out if device has user defined sensors
+#define HAS_SENSORS 1 // comment out if device has user defined sensors
 
 #define CFG_sx1276_radio 1 // select LoRa chip
 //#define CFG_sx1272_radio 1 // select LoRa chip
@@ -100,4 +106,4 @@
 #define MCP_24AA02E64_I2C_ADDRESS 0x50 // I2C address for the 24AA02E64 
 #define MCP_24AA02E64_MAC_ADDRESS 0xF8 // Memory adress of unique deveui 64 bits
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/hal/ttgov21new.h b/src/hal/ttgov21new.h
index 90f93c7a..e7292f2a 100644
--- a/src/hal/ttgov21new.h
+++ b/src/hal/ttgov21new.h
@@ -12,6 +12,12 @@
 // This settings are for boards labeled v1.6 on pcb, NOT for v1.5 or older
 */
 
+// SDS011 dust sensor settings
+#define HAS_SDS011 1 // use SDS011
+// used pins on the ESP-side:
+#define SDS_TX 19     // connect to RX on the SDS011
+#define SDS_RX 23     // connect to TX on the SDS011
+
 #define HAS_LORA 1       // comment out if device shall not send data via LoRa
 #define CFG_sx1276_radio 1 // HPD13A LoRa SoC
 
@@ -48,4 +54,4 @@
 #define LORA_IO1  (33)
 #define LORA_IO2  (32)
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/main.cpp b/src/main.cpp
index 7dd14a81..3e1814bd 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -323,10 +323,16 @@ void setup() {
 #endif
 
 #ifdef HAS_SDCARD
-  if (sdcardInit())
+  if (sdcard_init())
     strcat_P(features, " SD");
 #endif
 
+#if (HAS_SDS011)
+    ESP_LOGI(TAG, "init fine-dust-sensor");
+    if ( sds011_init() )
+        strcat_P(features, " SDS");
+#endif
+
 #if (VENDORFILTER)
   strcat_P(features, " FILTER");
 #endif
diff --git a/src/payload.cpp b/src/payload.cpp
index 323e402b..10c04ddc 100644
--- a/src/payload.cpp
+++ b/src/payload.cpp
@@ -80,7 +80,7 @@ void PayloadConvert::addStatus(uint16_t voltage, uint64_t uptime, float cputemp,
 }
 
 void PayloadConvert::addGPS(gpsStatus_t value) {
-#if(HAS_GPS)
+#if (HAS_GPS)
   buffer[cursor++] = (byte)((value.latitude & 0xFF000000) >> 24);
   buffer[cursor++] = (byte)((value.latitude & 0x00FF0000) >> 16);
   buffer[cursor++] = (byte)((value.latitude & 0x0000FF00) >> 8);
@@ -100,7 +100,7 @@ void PayloadConvert::addGPS(gpsStatus_t value) {
 }
 
 void PayloadConvert::addSensor(uint8_t buf[]) {
-#if(HAS_SENSORS)
+#if (HAS_SENSORS)
   uint8_t length = buf[0];
   memcpy(buffer, buf + 1, length);
   cursor += length; // length of buffer
@@ -108,7 +108,7 @@ void PayloadConvert::addSensor(uint8_t buf[]) {
 }
 
 void PayloadConvert::addBME(bmeStatus_t value) {
-#if(HAS_BME)
+#if (HAS_BME)
   int16_t temperature = (int16_t)(value.temperature); // float -> int
   uint16_t humidity = (uint16_t)(value.humidity);     // float -> int
   uint16_t pressure = (uint16_t)(value.pressure);     // float -> int
@@ -124,6 +124,16 @@ void PayloadConvert::addBME(bmeStatus_t value) {
 #endif
 }
 
+void PayloadConvert::addSDS(sdsStatus_t sds) {
+#if (HAS_SDS011)
+  char tempBuffer[10 + 1];
+  sprintf(tempBuffer, ",%5.1f", sds.pm10);
+  addChars(tempBuffer, strlen(tempBuffer));
+  sprintf(tempBuffer, ",%5.1f", sds.pm25);
+  addChars(tempBuffer, strlen(tempBuffer));
+#endif // HAS_SDS011
+}
+
 void PayloadConvert::addButton(uint8_t value) {
 #ifdef HAS_BUTTON
   buffer[cursor++] = value;
@@ -193,7 +203,7 @@ void PayloadConvert::addStatus(uint16_t voltage, uint64_t uptime, float cputemp,
 }
 
 void PayloadConvert::addGPS(gpsStatus_t value) {
-#if(HAS_GPS)
+#if (HAS_GPS)
   writeLatLng(value.latitude, value.longitude);
 #if (!PAYLOAD_OPENSENSEBOX)
   writeUint8(value.satellites);
@@ -204,7 +214,7 @@ void PayloadConvert::addGPS(gpsStatus_t value) {
 }
 
 void PayloadConvert::addSensor(uint8_t buf[]) {
-#if(HAS_SENSORS)
+#if (HAS_SENSORS)
   uint8_t length = buf[0];
   memcpy(buffer, buf + 1, length);
   cursor += length; // length of buffer
@@ -212,7 +222,7 @@ void PayloadConvert::addSensor(uint8_t buf[]) {
 }
 
 void PayloadConvert::addBME(bmeStatus_t value) {
-#if(HAS_BME)
+#if (HAS_BME)
   writeFloat(value.temperature);
   writePressure(value.pressure);
   writeUFloat(value.humidity);
@@ -220,6 +230,13 @@ void PayloadConvert::addBME(bmeStatus_t value) {
 #endif
 }
 
+void PayloadConvert::addSDS(sdsStatus_t sds) {
+#if (HAS_SDS011)
+  writeUint16((uint16_t)(sds.pm10 * 10));
+  writeUint16((uint16_t)(sds.pm25 * 10));
+#endif // HAS_SDS011
+}
+
 void PayloadConvert::addButton(uint8_t value) {
 #ifdef HAS_BUTTON
   writeUint8(value);
@@ -242,9 +259,7 @@ void PayloadConvert::uintToBytes(uint64_t value, uint8_t byteSize) {
   }
 }
 
-void PayloadConvert::writeUptime(uint64_t uptime) {
-  writeUint64(uptime);
-}
+void PayloadConvert::writeUptime(uint64_t uptime) { writeUint64(uptime); }
 
 void PayloadConvert::writeVersion(char *version) {
   memcpy(buffer + cursor, version, 10);
@@ -265,13 +280,9 @@ void PayloadConvert::writeUint16(uint16_t i) { uintToBytes(i, 2); }
 
 void PayloadConvert::writeUint8(uint8_t i) { uintToBytes(i, 1); }
 
-void PayloadConvert::writeUFloat(float value) {
-  writeUint16(value * 100);
-}
+void PayloadConvert::writeUFloat(float value) { writeUint16(value * 100); }
 
-void PayloadConvert::writePressure(float value) {
-  writeUint16(value * 10);
-}
+void PayloadConvert::writePressure(float value) { writeUint16(value * 10); }
 
 /**
  * Uses a 16bit two's complement with two decimals, so the range is
@@ -312,10 +323,29 @@ void PayloadConvert::writeBitmap(bool a, bool b, bool c, bool d, bool e, bool f,
 
 #elif ((PAYLOAD_ENCODER == 3) || (PAYLOAD_ENCODER == 4))
 
-void PayloadConvert::addByte(uint8_t value) { 
-  /* 
+void PayloadConvert::addByte(uint8_t value) {
+  /*
   not implemented
-  */ }
+  */
+}
+
+void PayloadConvert::addSDS(sdsStatus_t sds) {
+#if (HAS_SDS011)
+// value of PM10
+#if (PAYLOAD_ENCODER == 3) // Cayenne LPP dynamic
+    buffer[cursor++] = LPP_PARTMATTER10_CHANNEL;    // for PM10 
+#endif
+    buffer[cursor++] = LPP_LUMINOSITY; // workaround since cayenne has no data type meter
+    buffer[cursor++] = highByte((uint16_t)(sds.pm10 * 10));
+    buffer[cursor++] = lowByte((uint16_t)(sds.pm10 * 10));
+// value of PM2.5
+#if (PAYLOAD_ENCODER == 3) // Cayenne LPP dynamic
+    buffer[cursor++] = LPP_PARTMATTER25_CHANNEL;    // for PM2.5
+#endif
+    buffer[cursor++] = LPP_LUMINOSITY; // workaround since cayenne has no data type meter
+    buffer[cursor++] = highByte((uint16_t)(sds.pm25 * 10));
+    buffer[cursor++] = lowByte((uint16_t)(sds.pm25 * 10));
+#endif  // HAS_SDS011
 
 void PayloadConvert::addCount(uint16_t value, uint8_t snifftype) {
   switch (snifftype) {
@@ -393,7 +423,7 @@ void PayloadConvert::addStatus(uint16_t voltage, uint64_t uptime, float celsius,
 }
 
 void PayloadConvert::addGPS(gpsStatus_t value) {
-#if(HAS_GPS)
+#if (HAS_GPS)
   int32_t lat = value.latitude / 100;
   int32_t lon = value.longitude / 100;
   int32_t alt = value.altitude * 100;
@@ -414,18 +444,18 @@ void PayloadConvert::addGPS(gpsStatus_t value) {
 }
 
 void PayloadConvert::addSensor(uint8_t buf[]) {
-#if(HAS_SENSORS)
-// to come
-/*
-  uint8_t length = buf[0];
-  memcpy(buffer, buf+1, length);
-  cursor += length; // length of buffer
-*/
+#if (HAS_SENSORS)
+  // to come
+  /*
+    uint8_t length = buf[0];
+    memcpy(buffer, buf+1, length);
+    cursor += length; // length of buffer
+  */
 #endif // HAS_SENSORS
 }
 
 void PayloadConvert::addBME(bmeStatus_t value) {
-#if(HAS_BME)
+#if (HAS_BME)
 
   // data value conversions to meet cayenne data type definition
   // 0.1°C per bit => -3276,7 .. +3276,7 °C
@@ -489,5 +519,9 @@ void PayloadConvert::addTime(time_t value) {
   buffer[cursor++] = (byte)((tx_period & 0x000000FF));
 #endif
 }
+#endif // PAYLOAD_ENCODER
 
-#endif
\ No newline at end of file
+void PayloadConvert::addChars(char *string, int len) {
+  for (int i = 0; i < len; i++)
+    addByte(string[i]);
+}
diff --git a/src/sdcard.cpp b/src/sdcard.cpp
index 0633151f..5faab5cd 100644
--- a/src/sdcard.cpp
+++ b/src/sdcard.cpp
@@ -13,11 +13,13 @@ static void createFile(void);
 
 File fileSDCard;
 
-bool sdcardInit() {
+bool sdcard_init() {
   ESP_LOGD(TAG, "looking for SD-card...");
   useSDCard = SD.begin(SDCARD_CS, SDCARD_MOSI, SDCARD_MISO, SDCARD_SCLK);
   if (useSDCard)
     createFile();
+  else
+    ESP_LOGD(TAG, "SD-card not found");
   return useSDCard;
 }
 
@@ -25,6 +27,9 @@ void sdcardWriteData(uint16_t noWifi, uint16_t noBle) {
   static int counterWrites = 0;
   char tempBuffer[12 + 1];
   time_t t = now();
+#if (HAS_SDS011)
+  sdsStatus_t sds;
+#endif
 
   if (!useSDCard)
     return;
@@ -35,7 +40,13 @@ void sdcardWriteData(uint16_t noWifi, uint16_t noBle) {
   sprintf(tempBuffer, "%02d:%02d:%02d,", hour(t), minute(t), second(t));
   fileSDCard.print(tempBuffer);
   sprintf(tempBuffer, "%d,%d", noWifi, noBle);
-  fileSDCard.println(tempBuffer);
+  fileSDCard.print(tempBuffer);
+#if (HAS_SDS011)
+  sds011_store(&sds);
+  sprintf(tempBuffer, ",%5.1f,%4.1f", sds.pm10, sds.pm25);
+  fileSDCard.print(tempBuffer);
+#endif
+  fileSDCard.println();
 
   if (++counterWrites > 2) {
     // force writing to SD-card
@@ -58,8 +69,12 @@ void createFile(void) {
       ESP_LOGD(TAG, "SD: file does not exist: opening");
       fileSDCard = SD.open(bufferFilename, FILE_WRITE);
       if (fileSDCard) {
-        ESP_LOGD(TAG, "SD: name opended: <%s>", bufferFilename);
-        fileSDCard.println(SDCARD_FILE_HEADER);
+        ESP_LOGD(TAG, "SD: name opened: <%s>", bufferFilename);
+        fileSDCard.print(SDCARD_FILE_HEADER);
+#if (HAS_SDS011)
+        fileSDCard.print(SDCARD_FILE_HEADER_SDS011);
+#endif
+        fileSDCard.println();
         useSDCard = true;
         break;
       }
@@ -68,4 +83,4 @@ void createFile(void) {
   return;
 }
 
-#endif // (HAS_SDCARD)
\ No newline at end of file
+#endif // (HAS_SDCARD)
diff --git a/src/sds011read.cpp b/src/sds011read.cpp
new file mode 100644
index 00000000..a693f651
--- /dev/null
+++ b/src/sds011read.cpp
@@ -0,0 +1,65 @@
+// routines for fetching data from the SDS011-sensor
+
+#if (HAS_SDS011)
+
+// Local logging tag
+static const char TAG[] = __FILE__;
+
+#include "sds011read.h"
+
+#if (HAS_IF482)
+#error cannot use IF482 together with SDS011 (both use UART#2)
+#endif
+// UART(2) is unused in this project
+static HardwareSerial sdsSerial(2); // so we use it here
+static SDS011 sdsSensor;            // fine dust sensor
+
+// the results of the sensor:
+static float pm10, pm25;
+boolean isSDS011Active;
+
+// init
+bool sds011_init() {
+  pm25 = pm10 = 0.0;
+  sdsSensor.begin(&sdsSerial, SDS_RX, SDS_TX);
+  sds011_sleep(); // we do sleep/wakup by ourselves
+  return true;
+}
+
+// reading data:
+void sds011_loop() {
+  if (isSDS011Active) {
+    int sdsErrorCode = sdsSensor.read(&pm25, &pm10);
+    if (sdsErrorCode) {
+      pm25 = pm10 = 0.0;
+      ESP_LOGI(TAG, "SDS011 error: %d", sdsErrorCode);
+    } else {
+      ESP_LOGI(TAG, "fine-dust-values: %5.1f,%4.1f", pm10, pm25);
+    }
+    sds011_sleep();
+  }
+  return;
+}
+
+// retrieving stored data:
+void sds011_store(sdsStatus_t *sds_store) {
+  sds_store->pm10 = pm10;
+  sds_store->pm25 = pm25;
+}
+
+// putting the SDS-sensor to sleep
+void sds011_sleep(void) {
+  sdsSensor.sleep();
+  isSDS011Active = false;
+}
+
+// start the SDS-sensor
+// needs 30 seconds for warming up
+void sds011_wakeup() {
+  if (!isSDS011Active) {
+    sdsSensor.wakeup();
+    isSDS011Active = true;
+  }
+}
+
+#endif // HAS_SDS011
diff --git a/src/senddata.cpp b/src/senddata.cpp
index f4f6b085..a98c129e 100644
--- a/src/senddata.cpp
+++ b/src/senddata.cpp
@@ -63,9 +63,12 @@ void sendData() {
 
   uint8_t bitmask = cfg.payloadmask;
   uint8_t mask = 1;
-  #if (HAS_GPS) 
+#if (HAS_GPS)
   gpsStatus_t gps_status;
-  #endif
+#endif
+#if (HAS_SDS011)
+  sdsStatus_t sds_status;
+#endif
 
   while (bitmask) {
     switch (bitmask & mask) {
@@ -94,6 +97,10 @@ void sendData() {
         payload.addCount(macs_wifi, MAC_SNIFF_WIFI);
       if (cfg.blescan)
         payload.addCount(macs_ble, MAC_SNIFF_BLE);
+#endif
+#if (HAS_SDS011)
+      sds011_store(&sds_status);
+      payload.addSDS(sds_status);
 #endif
       SendPayload(COUNTERPORT, prio_normal);
       // clear counter if not in cumulative counter mode
@@ -172,4 +179,4 @@ void flushQueues() {
 #ifdef HAS_SPI
   spi_queuereset();
 #endif
-}
\ No newline at end of file
+}
diff --git a/src/timekeeper.cpp b/src/timekeeper.cpp
index ada140a6..df178dcb 100644
--- a/src/timekeeper.cpp
+++ b/src/timekeeper.cpp
@@ -16,6 +16,9 @@ static const char TAG[] = __FILE__;
 const char timeSetSymbols[] = {'G', 'R', 'L', '?'};
 
 #ifdef HAS_IF482
+#if (HAS_SDS011)
+#error cannot use IF482 together with SDS011 (both use UART#2)
+#endif
 HardwareSerial IF482(2); // use UART #2 (#1 may be in use for serial GPS)
 #endif