Adafruit_DHT binary needs updating with RPi 2 Base address

[justasrutkauskas]

DHT22 didn't work with RPi2 so had to update c file with RPi2 details:

#define BCM2709_PERI_BASE 0x3f000000

and recompile with updated bcm2835 lib (which has support for bcm2836 which is in RPi2, used 1.47 v).

Probably worth including this based on platform.

[ladyada]

Thank you for the Issue!
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