void txSD() {
  Serial.println("*** txSD ***");
  // if the file opened okay, write to it:
  if (myFile = SD.open("post.csv", FILE_WRITE)) {
  #if debuggEnabled
      Serial.println(F("Writing...")); 
  #endif 
    myFile.print(SENSORvalue[0]);
    myFile.print(",");
    myFile.print(sckRTCtime());
    myFile.println();
    // close the file:
    myFile.close();
#if debuggEnabled
    Serial.println(F("Closing...")); 
#endif 
  }
}

char* SENSOR[10]={
  "Temperature",
  "Humidity",
  "Light",
  "Battery",
  "Solar Panel",
  "Carbon Monxide",
  "Nitrogen Dioxide",
  "Noise",
  "Wifi Spots",
  "UTC"
};

char* UNITS[10]={
#if F_CPU == 8000000 
#if DataRaw
  " C RAW",
  " % RAW",
#else
  " C",
  " %",
#endif
#else
  " C",
  " %",
#endif
#if F_CPU == 8000000 
  " lx",
#else
  " %",
#endif
  " %",
  " V",
  " kOhm",
  " kOhm",
#if DataRaw
  " mV",
#else
  " dB",
#endif
  "",
  "" 
};            

void updateSensorsSD() {
  SENSORvalue[0] = average(S0)*Vcc/1023.*3;
}

void txDebugSD() {
  Serial.println("*** txDebugSD ***");
  Serial.print(SENSORvalue[0]);
  Serial.println(" mV");
  Serial.println(sckRTCtime());
  Serial.println(F("*******************"));     
}