thanks but since i am in europe i can't order from adafruit and the ADC you suggested is the smallest i have ever seen. I will never be cable of soldering it

Anyone knows and can suggest any external low noise ADC for arduino?

[works correct]

sprintf()
works correct
for char[];

about the time module have you got any suggections?
what to buy i mean

What extacly you want to read from?
analog or digital?

[Now anybody has an idea how to time the measuraments?]

That's a good idea, it worked and it is a clever one.

thanks.

Now anybody has an idea how to time the measuraments?

Just declare your variable as a float and myfile.print them to SD.

I was so used of converting everything to String that i didn't thought it
So thanks!!

In the otherhand the other two answers didn't not help because:

Code:

myFile = SD.open(filename, FILE_WRITE);
  myFile.print(test1);
  myFile.print(",");
  myFile.print(test2);
  myFile.print(",");

i don't want to write something different i want to give different filename!

For the date i have to find a way to change it automatically...

Thanks in advance!

I am trying to create a special datalogger for reading tiny amounts o voltage diff,
however i have 2-3 questions about the datalogging problem.

first: i want to create several logs in the form of

Code:

//Open the Data CSV File
  File dataFile = SD.open("test.txt", FILE_WRITE);

test1,
test2,
etc
i have tried

Code:

File dataFile = SD.open("test"+String(k)+".txt", FILE_WRITE);

but it's not working



second:
The dates on my output
all the text file on the Sd card are dated 1/1/2000
[img][file:///C:/Users/nerito/Pictures/arduino.jpg/img]


third :
any ideas how to uses floats on sd?

thank you in advance