Re: Re: Simat 1 wire Hubs

["Frank Mc Alinden" <frankmc@xxxxxxxxxxxxxxxx>]

Hi Jon

Thanks for the feedback......

Good to hear its all working out good for you......

What are Thermocron's...????

Frank


----- Original Message -----
From: "Jon Payne" <jgpayne@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Friday, November 16, 2007 1:09 AM
Subject: Re: [ukha_d] Re: Simat 1 wire Hubs


> (wow, just found this in my 'drafts' folder, obviously been sitting
there
> a while so apologies for those who wonder what this is about!)
>
> Hi Frank,
>
> I made this change (start temperature conversion of all devices on a
> branch and then go back later and read the temperature) and it has
reduced
> the time to take temperature readings.
>
> Unfortunately although all my temperature sensors are DS18B20's, some
are
> family code 0x10 and some are family code 0x28!
> Only the 0x10's work with the SkipRrom/ConvertT method, so I have to
> explicitely select and ConvertT on the 0x28 devices.Even the
combination
> of this, accessing all devices on a branch together and then going
back
> later to actually read the temperatures saves quite a bit of time and
more
> improtantly doesn't tie up the bus for anywhere near as long (because
the
> bus can be used whilst the temperature conversion's are being done).
>
> I've also added support for Louis Swart(sp?) LCDs (with xAP OSD) and
> reading of Thermocron's...
>
> Cheers,
> Jon
>
>
> ----- Original Message ----
> From: Frank Mc Alinden <frankmc@xxxxxxx>
> To: ukha_d@xxxxxxx
> Sent: Wednesday, 23 May, 2007 9:31:42 AM
> Subject: Re: [ukha_d] Re: Simat 1 wire Hubs
>
>
> Hi Jon
>
>> I'm going to look at optimising the temperature gathering now by
grouping
>> sensors by path(location on branches), which will also apply to
polled
>> sensors in general, and by starting >temperature conversion off
>> simultaneously (which I've only just realised can be done) for all
>> >sensors on that path, then fetching their readings
>
> Let us know how this goes ....
>
> Frank
> ----- Original Message -----
> From: "Jon Payne" <jgpayne@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: Wednesday, May 23, 2007 5:21 PM
> Subject: Re: [ukha_d] Re: Simat 1 wire Hubs
>
>
>> Great to know others are using 1-wire on UKHA!
>>
>> I have now speeded up my network scanning a little by using the
DS2409
>> SmartOn feature - this lets you determine whether there are /any/
devices
>> on a branch without having to actually scan it which obviously
saves time
>> if a branch is unused or used for touch contact ibutton
applications.
>>
>> I'm going to look at optimising the temperature gathering now by
grouping
>> sensors by path (location on branches), which will also apply to
polled
>> sensors in general, and by starting temperature conversion off
>> simultaneously (which I've only just realised can be done) for all
>> sensors
>> on that path, then fetching their readings.
>>
>> cheers,
>> jon
>>
>>
>> ----- Original Message ----
>> From: Frank Mc Alinden <frankmc@xxxxxxx>
>> To: ukha_d@xxxxxxx
>> Sent: Wednesday, 23 May, 2007 7:49:12 AM
>> Subject: Re: [ukha_d] Re: Simat 1 wire Hubs
>>
>>
>> Hi Mark / Jon
>>
>>> Sort of - as I understand it, it does a startup scan to detect
new
>>> devices and adds them to the database of connected devices. It
will
>>> then scan for devices in the database so if a device has been
>>> connected at any startup it should then be scanned for.
However, I
>>> think the new hub code breaks this in that the hub branch
number is
>>> remembered at startup and the devices are only searched for on
that
>>> branch.
>>
>> That appears to be the case from my observations as well....
>>
>>> Nice to see some 1-wire discussion here, I'm just getting into
it and
>>> going through the opnode sorce code has helped a lot but it's
good to
>>> hear of other ways of doing things.
>>
>> Keep us posted on your progress
>>
>> Frank
>>
>>
>>
>>
>>
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