sds011 more cleanups

include/sds011read.h

@@ -6,6 +6,14 @@
 
 #define SDCARD_FILE_HEADER_SDS011     ", PM10,PM25"
 
+// use original pins from HardwareSerial if none defined
+#ifndef SDS_TX
+#define SDS_TX -1
+#endif
+#ifndef SDS_RX
+#define SDS_RX -1
+#endif
+
 extern bool isSDS011Active;
 
 bool sds011_init();
@@ -13,5 +21,4 @@ void sds011_loop();
 void sds011_sleep(void);
 void sds011_wakeup(void);
 void sds011_store(sdsStatus_t *sds_store);
-
 #endif // _SDS011READ_H