Well, I was working on the 1-wire stuff this weekend and got a temp probe in my sump to monitor the water temp. Even though it looks like an "epoxy monster" it seems to work great so far.
I also converted my pH probe amplifier to a full-fledged 1-wire ready pH sensor. It runs off the 5V supply from the bus, so I need to etch a power injector to add power to my bus, but once I do that it's ready to put into use. I bench-tested it and fit all the guts nicely into the little housing so all you have to do is plug it into the net.
It was a matter of cross-referencing all the right pins and soldering them together. I added a 22uf capacitor to the amplifier's power bus to smooth any power drops, and also a 1uf Cap across the 1-wire AD bus & ground for the same reason. I found I got slightly more consistent readings that way. My accuracy with this puppy is to the hundredth (though I get more digits I don't trust them as they are merely "noise").
Here's a pic:
I was also doing some PERL scripting and have a script that will pull the sensors from my database, grab their values, and store said values back into the database. Then you can do trend, etc from there as you like.
I'm still tweaking the database schema, but you should be able to assign a sensor a roll (sump temp, pH, orp, hood temp, etc) and then at some later time change out that physical sensor without having to go change the script code. Just re-assign that role to a different (or new) sensor and it should work seamlessly. I'll post the database schema sometime here...
), but it is American Meter C700 Polymer 3/4"-9" LL 100% polymer version except for the register itself. There is an addon unit for it that adds a digital counter to it, as well as an optional 3/4" MPT connection kit for it. I ordered it from 
