Hi,

Rob Conway:
> For your furnace control I'd be placing an external delay off relay on an 
> additional DS2405 output and get the program to provide a pulse train say 
> every 10 seconds to keep the relay energised.  (i.e. watchdog timer)
> DOFF relay contact in series with another DS2405 output to control the 
> furnace.

Surprise, I already designed a circuit (still untested ...) which does
exactly that.

However, that's too low-level for me. Suppose the main system fails in
mid-winter? No central heating until I can get a replacement hard disk?

Nah.

-- 
Matthias Urlichs   |   {M:U} IT Design @ m-u-it.de   |  [EMAIL PROTECTED]
Disclaimer: The quote was selected randomly. Really. | http://smurf.noris.de
 - -
'Tis not in mortals to command success; But we'll do more, Sempronius -- we'll
deserve it.
                                        -- Addison

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