Issue with STR and FLOAT

[Whandall]

Your function

@hoeby

static char * dec (unsigned long long Dec) {
      sprintf(Str, "%lld", Dec);
      return Str;
}

tries to convert a binary uint64_t to a string representation in base 10, and fails on 8 bit Arduinos.

My code works.

If you want a different type of conversion, maybe your snippet should have been different?

And please post a complete sketch, not unrelated snippets.