Hi Mick,

I'm also running a heating system with owfs and 1-wire, some perl and 
python scripts and MB-Logic as HMI. I have a wood-burning oven with 18kW 
heating water in a 800l buffer. Then this water is mixed down to a lower 
temperature for each heating circuit: a floor-heating-circuit and a 
radiant-heater-circuit.

I have 15 temperature sensors all over the house and I used only one 
long strand as topology (ca. 30m long) - as per one of the 
recommendations of Dallas-Maxim.

I use the LinkUSBi as bus-master. All Slaves are externally powered (5V) 
by my PC-powersupply, because the LinkUSBi was not able to supply all 
the slaves.

The sensors are soldered to the main-strand, because I have no need for 
plugging them in or out all the time and it would just introduce 
problems in a rough enviroment (some sensors get frequently heated up to 
95 degC).

I am switching relais for pumps and mixers with 230V. This is realised 
by a self-built IO-board with 3 DS2408 and another self-built board 
holding the relais. I have the IO-board and the relais-board as 
Eagle-Schematics if you are interested - the IO-board is based on the 
original design of H. Roelle.

The system is very stable and reliable (well, the hardware-part of it, 
since the software is still very much WIP).

Feel free to ask more questions.

Greetings,

Martin


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