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  • It looks to me like you have a copy of the sha256.cpp file in your sketch which is causing the problem. Commented Jan 9, 2016 at 21:25
  • @Majenko , nope, but seeing the sketch would probably be useful... I'll get that into a repo and update the Q. Commented Jan 9, 2016 at 21:27
  • The error message tells me you have. "sketch/sha256.cpp.o:sketch/sha256.cpp:33: first defined here" Commented Jan 9, 2016 at 21:28
  • But I'm not sure how to interpret that. I only have one each of sha256.cpp and sha256.h, and I'm only including sha256.h from one place. I added a link to the sketch I'm using to test above. Commented Jan 9, 2016 at 21:34
  • 1
    Which of the myriad of DHT libraries are you using? Commented Jan 9, 2016 at 21:39