trying to datalog vernier shield data onto SD

Projects Programming
1

I'm using Sparkfun's vernier shield and analogAutoID sketch, and trying to add the SD card datalog language. The problem is what to add at the Open SD part:

// open the file. note that only one file can be open at a time,
// so you have to close this one before opening another.
File dataFile = SD.open("datalog.txt", FILE_WRITE);

// if the file is available, write to it:
if (dataFile) {
dataFile.println( );
dataFile.close( );
// print to the serial port too:
Serial.println();
}
// if the file isn't open, pop up an error:
else {
Serial.println("error opening datalog.txt");
}
}

I can't figure out how to get it to compile. When I put "Channel" in the print.ln () and close () I get a "Channel wasn't declared in this scope". It's declared earlier in the sketch, though. The entire sketch I'm working on is attached.

analogAutoID_with_SD_attempt.ino (22.1 KB)

2

Are you able to get examples from the SD library to work?

The problem with your variable is probably scope but I haven't gone through your ino. If it's too big to post in a code window (made with code tags) then there's more to read than I'm up for just now.

3

Gotcha. Thanks for moving. A little bit after sending I realized, "oh crap, I put my message in the wrong topic folder."

I'm able to use the SD library/language with basic analog read, so I know the core of it is fine. I'm still pretty inexperienced in programming, so I at least get the idea of something not declared, but like I said in the earlier post, it seems declared already.

4

I looked at you code and Channel is declared as a passed argument for many functions but not

float Thermistor(int Raw)

So perhaps you should include int Channel to int Raw and pass the value to Thermistor().