===== Wiring the AS3935 SPI Bus =====
 

   #define SPI_CS   5     // IO5 (D1)
   #define SPI_MOSI 13     // IO13 (D7)
   #define SPI_MISO 12     // IO12 (D6)
   #define SPI_SCK  14     // IO14 (D5)
   #define AS_INT    15     // IO15  (D8)
   #define NEOPIXEL  4     // IO4  (D2)
   
 I initially tried to hook the device CS to D8 but that prevented the ESP8266 from booting.\\
Instead I put the CS on D1 and placed the INT on D8. This worked.\\