Ok, I have committed the support code for the DS1821 thermostat and Paul
uploaded my document on the reset circuit to the examples section,
here<http://owfs.org/index.php?page=ds1821-thermostat-circuit----doug-collinge>
This stuff finally makes the DS1821 a usable device, actually fairly nice,
even. I have used it in two projects already and I'm pretty happy with it.
On Jan 20, 2008 6:44 PM, Doug Collinge <[EMAIL PROTECTED]> wrote:
> I have just completed support for the DS1821 thermostat chip,
> implementing all the features in the datasheet. It is tested and
> ready to commit as far as I can tell. What should I do with it?
>
> One of the little issues with the DS1821 is that, once you program it
> to be a thermostat it stops listening to the 1-wire bus so you can't
> unprogram it anymore. That is, unless you generate a magic reset
> sequence, which you can't generate on the 1-wire bus.
>
> Not to worry... I designed a little two-chip circuit that generates
> the necessary sequence that you could whip up in 20 minutes on a
> protoboard. You might even have all the parts on hand...
>
> It's all documented and ready to upload if you think anyone else might
> find it useful.
>
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