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Alex Rivera
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I am using the Arduino library. I would like to log some data from a sensor, date-time stamp it and write it to a SD card. To build the text file name I have tried String dataFileName = String(String(sedClock.getTime().year(),DEC) + String(sedClock.getTime().month(),DEC) + String(sedClock.getTime().day(),DEC) + String(sedClock.getTime().hour(),DEC) + String(sedClock.getTime().minute(),DEC) + String(sedClock.getTime().second(),DEC) + '_log.txt'); I would then like to log to that file using pinMode(SD_PIN,OUTPUT); dataFile = SD.open(dataFileName,FILE_WRITE); But I get no matching function call to SDClass::open(String&, int) candidates are: File SDClass::open(const char*,uint_8) But it seems that Arduino string doesn't have the equivalent of (const char *) dataFileName.c_str() So I can't figure out how to do the correct conversion Any help would be greatly appreciated.
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