Interesting data point, and makes me want to take another look. I have
both implementations written up and ended up using os.walk on owfs dir
as I found it fastest, despite having to write more code around it
(obviously).
Colin
On 5/20/2015 12:26 AM, Johan Ström wrote:
Hi,
just want to give +1 for pyownet. I'm using it for my network and it
works 100% flawless, scanning the alarm dir ~10 times per second and
the full bus every 30 second, reading ~25 temperature sensors every 30
seconds.
This have been running for about a year now, using my own master
software which was designed for a mixed network with slow but powered
temperature sensors and "quick" PIO-devices (such as DS2406), where it
is important to service any PIO input changes quickly (alarm + latch):
https://github.com/stromnet/pyowmaster
I have not yet tested the socket persistence though, that is on my
todo-list!
Johan
On 20/05/15 09:16, Stefano Miccoli wrote:
Let me answer to the python part of your question.
To access 1-wire sensors from a python script you have two options:
A) install the owserver daemon and access 1-wire data via the
owserver protocol (aka ownet), see
http://owfs.org/index.php?page=owserver-protocol
B) directly access the “physical bus” from your script.
Let discuss the two approaches.
*A) access via owserver.*
The owserver protocol is a TCP network protocol. In python you can
use either a pure python implementation, or link to an external C
library that implements the protocol.
As what regards pure python there are two options:
* ownet from the official distribution
* pyownet, available on pypi
https://pypi.python.org/pypi/pyownet (pip install pyownet) with
docs here: http://pyownet.readthedocs.org/en/latest/#
(I wrote pyownet to improve the official implementation, which is not
more maintained on pipy where it stuck at version 0.2 of 2006-12-15)
Alternatively you can go for a binary library binding, which will
introduce a run time dependency to libow
* ow from the official distribution
* pyowfs, available on pypi
https://pypi.python.org/pypi/pyowfs (pip install pyowfs) with
docs here: http://priesch.co.at/pyowfs
In the case of the owserver protocol I would suggest using one of the
two pure python implementations: bottleneck is usually the 1-wire
bus, so there is no need to go to a C implementation of the TCP
protocol. Performance is fairly good with both ownet and pyownet,
with a slight edge on pyownet, with implements socket persistence and
is actively maintained. (OK, this is the developer view.)
*B) direct access to the bus.*
This is not possible with pure python so you have to go with one of
the two C API bindings (the official ow or pyowfs). I have no
experience with this approach (I always install owserver first) so I
can’t give informed advice. However I would first try pyowfs since it
is maintained on pypi.
Bye
Stefano
On 20 May 2015, at 00:49, DavidJ61 <davejohn...@gmail.com
<mailto:davejohn...@gmail.com>> wrote:
Further to my above message, I am having a bit of a problem
accessing the
pressure attribute for the EDS environment sensor EDS0066. I have
trawled
google and am not able to find any documentation on how I can do
this. In
fact, as a whole, I have found this to be the case with owpython and it
seems I am missing my crystal ball.
I'd appreciate a bit of help and guidance.
--
View this message in context:
http://owfs-developers.1086194.n5.nabble.com/owpython-tp5410p11354.html
Sent from the OWFS Developers mailing list archive at Nabble.com
<http://Nabble.com>.
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