Limiting observations recorded in a spreadsheet
I have learned how to record sensor values från my Weatherhub sensors in a Google spreadsheet, but the number of recorded observations (rows entered in the spreadsheet) depends on the manufacturer's data refresh interval, as explained in this note
In this case the refresh interval can vary from less than a minute at least the 10 minutes, and I want to put a limit on how many of these observations really should be recorded in my spreadsheet. I can, of course, use the limit parameter in the Google actuator, but the shortest interval therein is 1 hour, and I would like to have one observation recorded every 15 minute (or one of every 5th observation or something like that). I have tried both the Counter and Delay functions, but I can't figure out if the really deliver what I want (or if it is even possible to create a behavour as described above).