restructure: splitting out sensor functions into their own source files

ens.h

@@ -0,0 +1,21 @@
+#ifndef ENS_H
+#define ENS_H
+
+#include <stdint.h>
+
+#define ENS_ADDR 0x53
+#define ENS_TEMP_IN 0x13
+#define ENS_HUM_IN 0x15
+#define ENS_STATUS 0x20
+#define ENS_STATUS_MASK 0x0C
+#define ENS_AQI 0x21
+#define ENS_TVOC 0x22
+#define ENS_ECO2 0x24
+#define ENS_ETOH 0x26
+
+void activateENS(void);
+void deactivateENS(void);
+uint8_t getENSData(double *t, double *h, uint8_t *AQI, uint16_t *TVOC,
+                   uint16_t *ECO2, uint16_t *ETOH);
+
+#endif // ENS_H