Taking samples every exact second

[Alexander_Sobolev]

Just a small comment:

Why build and write arrays? is not it easier / faster / scalable to write string:

Format into string rules!

And original topic starter's question:

Period varies +/- 1 ms, recorded time varies +/- 7 ms. 

It does not depend if Get time is forced to be right after Wait ms multiple.

Time Temperature Period

15:35:24.328    0.50   99
15:35:24.421    0.41   100
15:35:24.531    0.24   101
15:35:24.625    0.61    99
15:35:24.718    0.80    101
15:35:24.828    0.46    99