Finding maximum and minimum value analogRead

Projects Programming
1

Hi.

In my current project i have a datalogger storing 16 different sensorvalues from analogRead. I have no problem in reading and saving the to SD card. I have made start and stop datalogging with a simple high, low pin.
Every time i start logging i creates a new file and stores the data every 1 second for as long as the pin is high.
But what i would like, is to do some data processing with the stored data. I would like to find the minimum and maximum value of each sensor and some how store them in a buffer, ready for when i call for the values. I need to create a buffer with these values for every time i save a new collection of data.
Like this:
LOGGER00.csv follow by LOGGER00MINMAX.csv
LOGGER01.csv follow by LOGGER01MINMAX.csv

I hope you understand what i am trying to do.

But my question , how should i do it?
I have thinking about 2 different scenarios:

1: Hopefully there is some function/library which is capable of opening a .csv file and find min and max (statistic lib).

2: Create a parallel loop, which starts when i start datalogging, and thus compare is new value to the old value. And i the the end i have 16 Max values and 16 Min values which can be stored in a new csv file.

Which of the two is the best solution? Or is there something much simpler and smarter that what i have been thinking about?

I hope you can help me.

Best regards Bastian Gaardahl

3

2: Create a parallel loop, which starts when i start datalogging, and thus compare is new value to the old value. And i the the end i have 16 Max values and 16 Min values which can be stored in a new csv file.

This is definitely the way to go, although there is no need for a "parallel loop". The comparisons can be done in the same loop that you use for collecting the data.

But why do you need a separate file for the min and max values? Any program that later reads the main data file can determine those values.

4

That you very much for the fast response.

The reason why i need to store min and max values is:

I am trying to create a large datalogging system for motorsport with a LCD screen. The idea is to be able to go back after each race to see the max and min values. Mostly the max values.

Best regards Bastian

5

The idea is to be able to go back after each race to see the max and min values.

Yes, but why put them in separate files ?