You combine a dir and a filename.But this "SD.exists((" and "SD.open((" have double parentheses, that is very weird. Are you used with another programming language ?Please read how to use them:http://arduino.cc/en/Reference/SDexistshttp://arduino.cc/en/Reference/SDopenYou could make a buffer and use strcat() to create the full filename with path. You have to use a '/' between them. I checked my code, and I have something like this: "/ARDUINO/LOG.TXT"
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