It's easy to add "scratchpad" back to the properties. It would be more
elegant to add a specific "distance" value if you know how it's computed.
According to he DS18S20 datasheet, only bytes 2 and 3 (temperature limit
high and low) are writable, but Sensorbus-cm module might emulate and play
tricks. Do you want the CRC8 byte as well?
Paul Alfille
On Mon, Nov 19, 2012 at 4:27 PM, P4trykx <[email protected]> wrote:
> W dniu 19.11.2012 o 22:18 Steinar Midtskogen <[email protected]>
> pisze:
>
> > [email protected] writes:
> >
> >> There's a MS-Windowsprogram coming with the device which shows the
> >> distances nicely, so in principle this should work.
> >> I assume that measuring snow depth should not be much of a problem, but
> >> cannot verify at present time :-)
> >
> > If I had read the item description better, they claim that it can be
> > used to measure snow depth. Or rather the Sensorbus-cm-IP64 module.
> > It seems that the only difference between the Sensorbus-cm and
> > Sensorbus-cm-IP64 is the housing, but I find the price difference a
> > bit too large to jusitfy that, 79 vs 239 euro. My German isn't the
> > best, though. Do I miss something?
> >
> >> Btw, how many write cycles would the DS18S20 scratchpad withstand ?
> >
> > I think it's 100,000? But the DS18S20 is cheap and probably easy to
> > replace.
>
> So there is a microcontroller that reads data from the ultrasonic sensor
> and then somehow writes it DS18S20? It has to have some kind of switch to
> temporarily disconnect it from 1-wire bus while writing. There can't be
> 2 masters on one network.
>
> But I think that making an microcontroller just emulate DS18s20 would be
> an easier(and cheaper) solution so probably there is no real DS18S20
> inside.
>
> All above are just my suspicions maybe it works some other way.
>
>
>
> --
> p4trykx
>
>
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