initial

src/sds011read.cpp

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+// routines for fetching data from the SDS011-sensor
+
+// Local logging tag
+static const char TAG[] = __FILE__;
+
+#include <sds011read.h>
+
+// 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:
+float pm25;              
+float pm10;
+
+// init
+bool sds011_init()
+{
+    pm25 = pm10 = 0.0;
+    sdsSerial.begin(9600, SERIAL_8N1, ESP_PIN_RX, ESP_PIN_TX);
+    sdsSensor.begin (&sdsSerial);
+    sdsSensor.contmode(0);              // for safety: wakeup/sleep - if we want it we do it by ourselves
+    sdsSensor.wakeup();                 // always wake up
+    return true;
+}
+// reading data:
+void sds011_loop()
+{
+    pm25 = pm10 = 0.0;
+    int sdsErrorCode = sdsSensor.read(&pm25, &pm10);
+    if (!sdsErrorCode) 
+    {
+        ESP_LOGD(TAG, "SDS011 error: %d", sdsErrorCode);
+    } 
+    return;
+}