Updating the Blog

I updated the XBee and Swimming Pool pages.  They have links to the various parts to make it easier to find things.  I also added several items here and there.  Notable is the addition of my changes to the swimming pool solar heater to support the low flow rate my new variable speed permanent magnet pool motor (love saying that) can handle.  I can run the solar heater with as low as 5 pounds head pressure.  For you folks that don't understand that, this is a very good thing.  It means I can run the pool at about 270 watts during the peak period and still heat the water....for almost free.