Merge pull request #531 from AugustQu/patch-4

initial

lib/SDS011/src/SDS011.h

@@ -0,0 +1,40 @@
+// SDS011 dust sensor PM2.5 and PM10
+// ---------------------------------
+//
+// By R. Zschiegner (rz@madavi.de)
+// April 2016
+//
+// Documentation:
+//    - The iNovaFitness SDS011 datasheet
+//
+
+#if ARDUINO >= 100
+  #include "Arduino.h"
+#else
+  #include "WProgram.h"
+#endif
+
+#include <SoftwareSerial.h>
+
+// Definition SDS011 sensor 'commands'
+#define SDS_START_CMD             1
+#define SDS_STOP_CMD              2
+#define SDS_CONTINUOUS_MODE_CMD   3
+#define SDS_VERSION_DATE_CMD      4
+
+class SDS011 {
+  public:
+    SDS011(void);
+    void begin(uint8_t pin_rx, uint8_t pin_tx);
+    void begin(HardwareSerial* serial);
+    void begin(SoftwareSerial* serial);
+    int read(float *p25, float *p10);
+    void sleep();
+    void wakeup();
+    void contmode( int );
+  private:
+    void SDS_cmd(const uint8_t);
+    uint8_t calcChecksum( byte *);
+    uint8_t _pin_rx, _pin_tx;
+    Stream *sds_data;
+};