Attempting to get owfs running with Owfs_Item

[Greg Moeller]

I've finally wired up my hobby-boards.com 1wire hardware and am trying
to get MH to chat with it.
I'm wanting to read some inputs from my doorbell button, garage door
sensors, a temp sensor or two, and open/close the garage door.
I have the 6 port master hub (2480b, 3x2409P), 8 relay IO board (2408),
and a temp board (18s20)
I've got owserver working and owhttpd chatting with it. Using owfs-2.7p38.
I've put owfs_port in mh.private
And my code dir in owfs.pl

use Owfs_Item;
use Owfs_Thermostat;

# Fetch a new temperature value once a minute
my $therm1   = new Owfs_Item ( "10.0C7694010800", "Sewing Room" );
my $temp;
if (new_minute) {
   $temp = $therm1->get( "temperature");
#    $temp = (($temp*9)/5)+32;
       print_log "The temperature in the Sewing Room is now $temp degree
Fahrenheit";
       }

Don't seem to get anything useful back out of $temp but don't seem to
have any errors either even with debug owfs

Am I missing something?

Greg


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[Jim Duda]

On Mon, 05 Jul 2010 21:19:51 -0500, Greg Moeller wrote:

> I've finally wired up my hobby-boards.com 1wire hardware and am trying
> to get MH to chat with it.
> I'm wanting to read some inputs from my doorbell button, garage door
> sensors, a temp sensor or two, and open/close the garage door. I have
> the 6 port master hub (2480b, 3x2409P), 8 relay IO board (2408), and a
> temp board (18s20)
> I've got owserver working and owhttpd chatting with it. Using
> owfs-2.7p38. I've put owfs_port in mh.private
> And my code dir in owfs.pl
>
> use Owfs_Item;
> use Owfs_Thermostat;
>
> # Fetch a new temperature value once a minute my $therm1   = new
> Owfs_Item ( "10.0C7694010800", "Sewing Room" ); my $temp;
> if (new_minute) {
>    $temp = $therm1->get( "temperature");
> #    $temp = (($temp*9)/5)+32;
>        print_log "The temperature in the Sewing Room is now $temp degree
> Fahrenheit";
>        }
>
> Don't seem to get anything useful back out of $temp but don't seem to
> have any errors either even with debug owfs
>
> Am I missing something?

Greg,

What do you set owfs_port to in your mh.private.ini?  The library code
defaults to port 3030.  I have this:

owfs_port = 3030

I start my owfs_server using port 3030 like this:

/usr/local/bin/owfs -F -s 3030 -m /mnt/owfs --nozero

If you are using something other than port 3030 for your server, then you
need to change owfs_port in your mh.private.ini file to match.

If you get this working, you can try this next:
my $therm1 =  new Owfs_DS18S20 ( "10.0C7694010800", "Sewing Room" );

Then you can do $term1->get_temperature( ) anytime you want.  The
Owfs_DS18S20 has it's own timer to avoid banging on the OWFS bus too
often.

Regards,

Jim



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[Marc MERLIN-7]

On Wed, Jul 07, 2010 at 12:42:17AM +0000, Jim Duda wrote:
> If you are using something other than port 3030 for your server, then you
> need to change owfs_port in your mh.private.ini file to match.
>
> If you get this working, you can try this next:
> my $therm1 =  new Owfs_DS18S20 ( "10.0C7694010800", "Sewing Room" );
>
> Then you can do $term1->get_temperature( ) anytime you want.  The
> Owfs_DS18S20 has it's own timer to avoid banging on the OWFS bus too
> often.

Hi Jim,

So I had meant to ask you. For now I'm using owfs through XPL since it does
out of band querying and caching so that mh never hangs when getting owfs
values.

Since I had issues getting the owfs perl library working, I never was able
to try your code, but I'm curious: does your code prefetch all owfs values
and return them from the cache, or it will hit the owfs tree and possibly
hang for a bit if the owfs cache is out of date?

Marc
--
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems & security ....
                                      .... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/ 

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[Jim Duda]

On Wed, 07 Jul 2010 22:35:16 -0700, Marc MERLIN wrote:

> On Wed, Jul 07, 2010 at 12:42:17AM +0000, Jim Duda wrote:
>> If you are using something other than port 3030 for your server, then
>> you need to change owfs_port in your mh.private.ini file to match.
>>
>> If you get this working, you can try this next: my $therm1 =  new
>> Owfs_DS18S20 ( "10.0C7694010800", "Sewing Room" );
>>
>> Then you can do $term1->get_temperature( ) anytime you want.  The
>> Owfs_DS18S20 has it's own timer to avoid banging on the OWFS bus too
>> often.
>
> Hi Jim,
>
> So I had meant to ask you. For now I'm using owfs through XPL since it
> does out of band querying and caching so that mh never hangs when
> getting owfs values.

Marc,

If you use the Owfs_DS18S20 or Owfs_DS2450 you'll get what you are
looking for (no stalls).  What they do is use the "simultaneous"
mechanism in order to update the cache.  A timer is used to go back and
read the value from the cache.  The similiar mechanism is used in
Owfs_Thermostat which I use to control all of my Heat and AC in my house.

I personally don't experience any stalls in my environment, however, I
wrote Owfs_Item (and friends) and therefore know how they work.

Personally, I think using xAP or xPL is the proper way to handle this
sort of thing.  I would like to use a backend processor of OWFS like that
as well, however, what I have is working for me.

Jim



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