My favourite Arduino project is a data logger (based on Adafruit logging shield) for monitoring temperatures around the house in order to improve energy efficiency. I have now upgraded to a cloud solution with the intention of several data collection things around the house plus a central logger thing still with an SD card for storing th data. However, I am wondering whether I need to log at all since i can download the historic data from my dashboard. However, in order to sensibly process and graph the data in excel I would prefer it if my data is aligned with the time, for example if I update every 15 minutes then I would like it to be at 12.00, 12.15,12.30 etc and for example at 12.04, 12.19, 12.34. Is this possible or am i being too picky?
You can save a timestamp with each recorded value. That's what I do on my home monitoring system. You can then use that as the x-axis on your Excel plots.
Why does it matter, the important part is they are 15 min apart, but the day will come when that breaks. Just use an axis in minutes and let the data points fall where they fall. Excell will take care of smoothing the chart.
So save a time stamp.
Been there, done that.
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OK, Thank you for your help and comments. Seems it isn't worth worrying about it.
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