My daughter and son in law operate a perennial nursery.
Several years ago I built a misting system for one of their
greenhouses. It works fine - all analog, no smarts. A
misting duration of about two seconds every twenty minutes
or so usually does the job.  If the weather changes someone
needs to manually alter the interval. I would like to make
another, microcontroller, version which monitors the
temperature and relative humidity and makes appropriate
changes. I know there are a lot of other factors involved
but they have standardized on soil, pot size, etc. so most
of those are relatively constant. It is gross changes in
temperature and relative humidity that seem to be most
important. There is no wind in the greenhouse.

Are there any algorithms or charts available which would be
helpful in computing the necessary changes?

Allen


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