el_supremo:
I would like to save to my card in CSV format.
That means that you have to output all the values as ASCII strings with commas between them so it doesn't matter whether the variables are char, int or float. They'll all end up as strings anyway.
Pete
That does simplify the second question, thank you for that!
Did I choose the right type for my array to contain the values of int and float? I may need to learn how to create ASCII strings from my values. I will start that tomorrow.