Re: MMIR X-10 Macro IR Module

["Robert Green" <ROBERT_GREEN1963@xxxxxxxxx>]

"Jeff Volp" <JeffVolp@xxxxxxx> wrote
> "Robert Green" <ROBERT_GREEN1963@xxxxxxxxx> wrote

> > Although thermistors are non-linear, aren't their outputs fairly
> > repeatable?

<stuff snipped>

> Yes, they are very repeatable, and you can actually calculate the voltage
> for each temperature.  So it is possible to build a look-up chart.

Sold!

> I prefer to just crank it through the formula to get degrees.

Ah, but you're one of our star resident PIC-masters.  Not me!  If the
HomeVision unit is put to any kind of temperature related-chore, it's a
pretty good assumption that I'll use a look-up table instead of my bad math.
I was trying to calculate the turbine tip speed of a jet engine for another
thread here and my first try gave me a speed of 458,000 MPH.  I think I
eventually got it right, but it took a few tries.

> I log the daily extremes, and temperature at sunrise.  I use those to
control
> auxiliary ventilation, and calculate the irrigation cycles we use during
the summer.

My wife has expressed my desire to keep temp stats as being a grown-up
version of teenager's obsession with baseball stats.  I disagree, of course,
although it's a moot point regarding the wireless ones, at least.

> Trying to grow anything in a few inches of soil on top of lava is tough.

Is that natural lava or imported?  I'd be reluctant to live anywhere there
were fresh volcano tracks.  Or ANY volcano tracks, come to think of it.  (-:

--
Bobby G.