Problem creating a log file header

Using Arduino Programming Questions
1

Hi I'm trying to make a temperature logger though struggling to get a header automatically added to my csv files!

For some reason (beyond me!) I can log data to a csv file though can't initially add the headers.

Therm_temp_logger.ino (2.57 KB)

2

You must write the header just after opening a NEW file

3

robtillaart:
You must write the header just after opening a NEW file

I thought I had done that in my sketch! Can you advise further please?

//Write Log File Header
  File logFile = SD.open("LOG.csv, FILE_WRITE");
  if (logFile)
  {
    logFile.println(", ,");  //Just a leading blank line, incase there was previous data
    logFile.println("ID, Temp1");
    logFile.close();
    Serial.println("ID, Temp1");
  }
  else
  {
    Serial.println("buggered");
  }
4

some hints ..

void setup()
{
  Serial.begin(9600);
  analogReference(EXTERNAL);
  
  delay(10000);
  Serial.println("Initializing Card");
  //CS Pin is an output
  pinMode(CS_pin, OUTPUT);
  
  //Check if card ready
  if(!SD.begin(CS_pin))
  {
    Serial.println("Card Failure");
    return;   //////////////////////////////  will continue with loop!
  }
  Serial.println("Card Ready");

  // 
  bool newfile = SD.exists("LOG.csv");  // something like this

  //Write Log File Header
  File logFile = SD.open("LOG.csv, FILE_WRITE");
  if (logFile)
  {
    if (newfile)
    {
       logFile.println("ID, Temp1, Temp2");
    }
    else
    {
      logFile.println(", , "); 
    }
    logFile.close();
    Serial.println("ID, Temp1");
  }
  else
  {
    Serial.println("Couldn't open log file");
  }
}
5

robtillaart:
some hints ..

Unfortunately I'm still receiving:-

Initializing Card
Card Ready
Couldn't open log file
1, 22
2, 22
3, 22

6

replace
File logFile = SD.open("LOG.csv, FILE_WRITE");

with

File logFile = SD.open("LOG.csv", FILE_WRITE);

7

robtillaart:
replace
File logFile = SD.open("LOG.csv, FILE_WRITE");

with

File logFile = SD.open("LOG.csv", FILE_WRITE);

God how simple a mistake! Thanks, your a life saver! If only I could of asked you that 4 hours ago lol

8

I didn't see it in the first quick look either :wink:

9