diff --git a/include/globals.h b/include/globals.h
index 41002c32..22ed8954 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 719d59ec..a7de4ddd 100644
--- a/include/payload.h
+++ b/include/payload.h
@@ -59,8 +59,7 @@ public:
   void addButton(uint8_t value);
   void addSensor(uint8_t[]);
   void addTime(time_t value);
-  void addPM10(float value);
-  void addPM25(float value);
+  void addSDS(sdsStatus_t value);
 private:
   void addChars( char* string, int len);
 
diff --git a/include/sds011read.h b/include/sds011read.h
index 8c573c0d..97307d1c 100644
--- a/include/sds011read.h
+++ b/include/sds011read.h
@@ -1,6 +1,7 @@
 #ifndef _SDS011READ_H
 #define _SDS011READ_H
 
+#include "globals.h"
 #include <SDS011.h>
 
 #define SDCARD_FILE_HEADER_SDS011     ", PM10,PM25"
@@ -9,5 +10,6 @@ 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 704ebdc7..3a1e9cfb 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -73,8 +73,7 @@ lib_deps_sensors =
     Adafruit BME280 Library@>=2.0.0
     Adafruit BMP085 Library@>=1.0.1
     BSEC Software Library@1.5.1474
-    ;SDS011 sensor Library
-    https://github.com/ricki-z/SDS011.git#33fd8b6
+    https://github.com/ricki-z/SDS011.git#33fd8b6 ;SDS011 sensor Library
 lib_deps_basic =
     ArduinoJson@^5.13.1
     76@>=1.2.4 ; #76 Timezone by Jack Christensen
diff --git a/src/gpsread.cpp b/src/gpsread.cpp
index 03318284..0205cc9d 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 fa1d14c7..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
diff --git a/src/hal/ttgov21new.h b/src/hal/ttgov21new.h
index 9fa665f2..e7292f2a 100644
--- a/src/hal/ttgov21new.h
+++ b/src/hal/ttgov21new.h
@@ -15,8 +15,8 @@
 // SDS011 dust sensor settings
 #define HAS_SDS011 1 // use SDS011
 // used pins on the ESP-side:
-#define ESP_PIN_TX 19     // connect to RX on the SDS011
-#define ESP_PIN_RX 23     // connect to TX on the SDS011
+#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
diff --git a/src/payload.cpp b/src/payload.cpp
index 57428234..b3291348 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 +323,25 @@ 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)
+
+#if (PAYLOAD_ENCODER == 3) // Cayenne LPP dynamic
+#error not implemented yet
+#endif
+
+#if (PAYLOAD_ENCODER == 4) // Cayenne LPP packed
+#error not implemented yet
+#endif
+
+#endif // HAS_SDS011
+}
 
 void PayloadConvert::addCount(uint16_t value, uint8_t snifftype) {
   switch (snifftype) {
@@ -393,7 +419,7 @@ 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 +440,18 @@ 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
@@ -491,39 +517,7 @@ void PayloadConvert::addTime(time_t value) {
 }
 #endif // PAYLOAD_ENCODER
 
-void PayloadConvert::addPM10( float value) {
-#if (HAS_SDS011)
-#if (PAYLOAD_ENCODER == 1)   // plain
-    char tempBuffer[10+1];
-    sprintf( tempBuffer, ",%5.1f", value);
-    addChars(tempBuffer, strlen(tempBuffer));
-#elif (PAYLOAD_ENCODER == 2 ) // packed
-    writeUint16( (uint16_t) (value*10) );
-#elif (PAYLOAD_ENCODER == 3 ) // Cayenne LPP dynamic
-#error not implemented yet
-#elif (PAYLOAD_ENCODER == 4 ) // Cayenne LPP packed
-#error not implemented yet
-#endif
-#endif // HAS_SDS011
-}
-
-void PayloadConvert::addPM25( float value) {
-#if (HAS_SDS011)
-#if (PAYLOAD_ENCODER == 1)   // plain
-    char tempBuffer[10+1];
-    sprintf( tempBuffer, ",%5.1f", value);
-    addChars(tempBuffer, strlen(tempBuffer));
-#elif (PAYLOAD_ENCODER == 2 ) // packed
-    writeUint16( (uint16_t) (value*10) );
-#elif (PAYLOAD_ENCODER == 3 ) // Cayenne LPP dynamic
-#error not implemented yet
-#elif (PAYLOAD_ENCODER == 4 ) // Cayenne LPP packed
-#error not implemented yet
-#endif
-#endif // HAS_SDS011
-}
-
-void PayloadConvert::addChars( char * string, int len) {
-  for (int i=0; i < len; i++)
-      addByte(string[i]);
-}
+void PayloadConvert::addChars(char *string, int len) {
+  for (int i = 0; i < len; i++)
+    addByte(string[i]);
+}
\ No newline at end of file
diff --git a/src/sdcard.cpp b/src/sdcard.cpp
index 002cfdf8..5faab5cd 100644
--- a/src/sdcard.cpp
+++ b/src/sdcard.cpp
@@ -6,12 +6,6 @@
 static const char TAG[] = __FILE__;
 
 #include "sdcard.h"
-#if (HAS_SDS011)
-#include <sds011read.h>
-// the results of the sensor:
-extern float pm25;              
-extern float pm10;
-#endif
 
 static bool useSDCard;
 
@@ -25,7 +19,7 @@ bool sdcard_init() {
   if (useSDCard)
     createFile();
   else
-      ESP_LOGD(TAG,"SD-card not found");
+    ESP_LOGD(TAG, "SD-card not found");
   return useSDCard;
 }
 
@@ -33,6 +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;
@@ -43,12 +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.print( tempBuffer);
+  fileSDCard.print(tempBuffer);
 #if (HAS_SDS011)
-    sprintf(tempBuffer, ",%5.1f,%4.1f", pm10, pm25);
-    fileSDCard.print( tempBuffer);
+  sds011_store(&sds);
+  sprintf(tempBuffer, ",%5.1f,%4.1f", sds.pm10, sds.pm25);
+  fileSDCard.print(tempBuffer);
 #endif
-  fileSDCard.println( );
+  fileSDCard.println();
 
   if (++counterWrites > 2) {
     // force writing to SD-card
@@ -72,9 +70,9 @@ void createFile(void) {
       fileSDCard = SD.open(bufferFilename, FILE_WRITE);
       if (fileSDCard) {
         ESP_LOGD(TAG, "SD: name opened: <%s>", bufferFilename);
-        fileSDCard.print( SDCARD_FILE_HEADER );
+        fileSDCard.print(SDCARD_FILE_HEADER);
 #if (HAS_SDS011)
-        fileSDCard.print( SDCARD_FILE_HEADER_SDS011 );
+        fileSDCard.print(SDCARD_FILE_HEADER_SDS011);
 #endif
         fileSDCard.println();
         useSDCard = true;
diff --git a/src/sds011read.cpp b/src/sds011read.cpp
index f280fbe6..a693f651 100644
--- a/src/sds011read.cpp
+++ b/src/sds011read.cpp
@@ -1,5 +1,7 @@
 // routines for fetching data from the SDS011-sensor
 
+#if (HAS_SDS011)
+
 // Local logging tag
 static const char TAG[] = __FILE__;
 
@@ -13,17 +15,14 @@ static HardwareSerial sdsSerial(2); // so we use it here
 static SDS011 sdsSensor;            // fine dust sensor
 
 // the results of the sensor:
-float pm25;
-float pm10;
+static float pm10, pm25;
 boolean isSDS011Active;
 
 // init
 bool sds011_init() {
   pm25 = pm10 = 0.0;
-#if (HAS_SDS011)  
-  sdsSensor.begin (&sdsSerial,  ESP_PIN_RX, ESP_PIN_TX);
-#endif  
-  sds011_sleep();        // we do sleep/wakup by ourselves
+  sdsSensor.begin(&sdsSerial, SDS_RX, SDS_TX);
+  sds011_sleep(); // we do sleep/wakup by ourselves
   return true;
 }
 
@@ -42,6 +41,12 @@ void sds011_loop() {
   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();
@@ -56,3 +61,5 @@ void sds011_wakeup() {
     isSDS011Active = true;
   }
 }
+
+#endif // HAS_SDS011
diff --git a/src/senddata.cpp b/src/senddata.cpp
index f5b867f6..a98c129e 100644
--- a/src/senddata.cpp
+++ b/src/senddata.cpp
@@ -3,11 +3,6 @@
 
 Ticker sendcycler;
 
-#if (HAS_SDS011)
-extern float pm10;
-extern float pm25;
-#endif
-
 void sendcycle() {
   xTaskNotifyFromISR(irqHandlerTask, SENDCYCLE_IRQ, eSetBits, NULL);
 }
@@ -68,9 +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) {
@@ -101,8 +99,8 @@ void sendData() {
         payload.addCount(macs_ble, MAC_SNIFF_BLE);
 #endif
 #if (HAS_SDS011)
-      payload.addPM10(pm10);
-      payload.addPM25(pm25);
+      sds011_store(&sds_status);
+      payload.addSDS(sds_status);
 #endif
       SendPayload(COUNTERPORT, prio_normal);
       // clear counter if not in cumulative counter mode