Daniel MacKay | 3 Mar 00:57 2015
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"Deep Blue" sensor

Hey guys, is this 1-wire? The labelling suggests it is. if so - it's a very good deal.

http://www.dx.com/p/temperature-humidity-sensor-dht11-module-for-arduino-deep-blue-works-with-official-arduino-board-288612?utm_source=dx&utm_medium=edm&utm_campaign=en20150302superbrain
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Paul Alfille | 27 Feb 16:28 2015
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New release 3.0p1

OWFS Release Notes
3.0p1
Feb 27, 2015

New Features.
1. owhttpd supports "sparse arrays"
   A. Based on feedback by Eugenio Torrini
   B. Sparse arrays allow the file extension to have any value, e.g. a password in the case of the DS1991
   C. owhttpd now has an extension input field for sparse arrays
   D. web pages still don't require javascript or HTML5 features
   E. Fully backwards compatible
2. Preliminary DS1WM support
   A. This is the freely available 1-wire bus master design from Maxim
   B. Can be implemented in FPGA
   C. Preliminary feedback and testing from Martin Rapavy
   D. Needs a hardware address for mapping device registers
   E. Maps system memory directly -- root only
   F. Competes with an in-kernel w1 module
  
Fixes
1. Fixed DS1991 support
   A. Based on observations and testing by Eugenio Torrini
   B. Uses a different directory structure
      a. subkey0, subkey1, subkey2
   C. Follows datasheet more closely
   D. NOT BACKWARDS COMPATIBLE
      But the old way didn't work so clearly wasn't being used.

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Daniel MacKay | 26 Feb 20:48 2015
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"temperature" vs "temperature10"

Hi guys, just a reminder (I needed it, so I figure many people on this list must too): it is a LOT quicker to read
"temperature10" than "temperature" - a couple orders of magnitude I think.  

"temperature10" gets you two 10 bits of precision which I think is the same accuracy as the sensor itself, so
there's very little point reading it to 3 or 4 digits of precision, and it's very quick to read.
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Roland Franke | 24 Feb 20:35 2015
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owfs 3.0.0 -> Problems by first startup

Hello <at> all,
i have some problems with the first startup of owfs 3.0.0
My configuration is the same as by 2.9.9 but now i get some faults:
By the first startup of owfs with an combinated configuration-file i get the message
 
fli4l kern.warn kernel: usb 1-2: usbfs: interface 0 claimed by usbfs while 'owserver' sets config #1
 
and owfs will not start.
My configuration (/var/run/owfs.conf) is:
error_print = 3
error_level = 1
format = f.i
cache_size = 0
Celsius
background
allow_other
server: usb
server: port = 127.0.0.1:4304
server: pid_file = /var/run/owsever.pid
http: server = 127.0.0.1:4304
http: port = 8080
http: pid_file = /var/run/owhttpd.pid
owfs: server = 127.0.0.1:4304
owfs: pid_file = /var/run/owfs.pid
owfs: mountpoint = /mnt/1wire
 
I will first start owserver –c /var/run/owfs.conf
then owhttpd –c /var/run/owfs.conf
and as last owfs –c /var/run/owfs.conf
during the startup of my computer and it fail with the message from the kernel.
 
If I after the complete start write manualy the 3 startlines identical, all will work
fine. But that is not the best way. Hope that you can help me in that matter.
In case that you will need more information, please ask.
 
Best regards,
Roland Franke
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Peter Hollenbeck | 21 Feb 20:29 2015
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Voltage Divider

I am using a LinkUSB and an MS-TV to read voltage from a 12 volt system. The MS-TV is limited to 10 volts so a made a voltage divider. I know next to nothing about electronics. Two weeks ago, with a test 12v power supply I played with various resistor values, from 1K to 1M. The 1K resistors appeared to give the best reading, about 6 volts. The higher the value the lower the output. Now, working with a real 12v battery system I am getting values ranging all over - .1, .82, .07, 10+, and rarely something reasonable, like 6.6.Within several minutes I just got 0.7 followed by 9.75. An inverter connected to the battery bank displays 12.1 volts and the output from my program shows .71 volts.

My divider looks like this:

                            1K               1K
       ---------^v^v------------^v^v-----------------------
       |                    |                  |                |
       |                    |                  |                |
       |                    |                  |                |
       |                    |                  |                |
 battery (+)              |                  |           battery (-)
                      MS-TV          MS-TV    
                      red wire        black wire

I sure would appreciate suggestions.
Thank you,
Peter

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Matthias Urlichs | 20 Feb 21:40 2015
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How to talk to an 1wire device

Hello,

for home automation I'm (finally) going to implement a couple of
semi-intelligent 1wire slaves. Control the heating system, water the garden,
and other things that can't be done by a central server and dumb 1wire
slaves because the house will burn down and the yard'll get flooded. ;-)
(Don't worry, there'll still be other safeguards.)

However, to actually talk to these things will require some new if there's
no closely-related existing chip to copy.

So, is there some sort of "howto" to that process, do I just copy a device
that sortof seems to do what I want and muddle through -- or do I simply
email the specs of what I want to do to Paul and let him do it? ;-)

Regards,
-- Matthias

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Jan Kandziora | 18 Feb 23:47 2015
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Re: DS2423 strangeness (again)

Am 18.02.2015 um 23:07 schrieb Gregg Levine:
> Hello!
> He cited that the resistor was connected to the counter inputs to the
> Voltage Battery input point.
> 
> However I'm more inclined to try your idea then his. Which is of
> course what I'm looking for.
>
You certainly need a capacitor for debouncing, the resistor alone - it
does nothing.

                  +5V
                   |
                   |
                   /
                   \  10k
                   /
                   |
                   |
CounterInput-------+-----------.
                   |           |
                   |           o |
                  --- 10n        |--
                  ---          o |
                   |           |
                   |           |
                  GND         GND

(With the capacitor but without the resistor, you get a very slow
debouncing effect, as the DS2423 has a very high-ohmic pullup resistor
built-in. So you can try with a 100pF capacitor alone, but I don't
recommend it because of the tolerance of the internal pullup.)

Kind regards

	Jan

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Larry Knox | 18 Feb 16:19 2015
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DS1921G in SSOP16 question

hello all,
been playing around with onewire since the original DS weather station came out. while looking at DS offerings on ebay i came across the following "DS1921G IN SSOP16. i couldn't locate the data sheet for the DS1921G in SSOP16, only in the familiar ibutton. does anyone know of a location for the pin out or datasheet for these. if they work it would be interesting for those who would like to try working them into their own designs. they are VERY cheap, only about a dollar apiece.
larry

thanks for a great group, learned alot off the board.

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Martin Rapavy | 18 Feb 10:35 2015

Add support for additional hardware bus master

Dear owfs developers,

 

I’m currently exploring options of adding custom hardware-based onewire master chip support into owfs. Could you explain which parts of the software stack of owfs would need to be extended/altered in order to add new bus master support (or perhaps point me to relevant documents).

I like what owfs offers very much and would like to use it the project I’m working on. However I’m bound to that custom onewire master chip which is obviously not yet supported by owfs.

 

Thank you very much in advance.

 

Best regards,

Martin Rapavy

 

 

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Gregg Levine | 18 Feb 08:23 2015
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DS2423 strangeness (again)

Hello!
I am again investigating the strange behavior of the DS2423 I have here.

So far the thing does much as it did do earlier on. However I made use of Google giving it "ds2423 resistor" as the search key (inside the quotes) and it promptly presented me with an interesting series of responses. One looked almost promising, which is here:

In it he writes that it needed a 4.7K pull up resistor to Vbat. Well I found one and attached it. Same strange behavior as before. But what I'm concerned with more is what are the rest of us doing with their parts? What resistor value was selected for all of yours, and what is the part doing?
-----
Gregg C Levine gregg.drwho8 <at> gmail.com
"This signature fought the Time Wars, time and again."
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Gregg Levine | 16 Feb 21:21 2015
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Running owfs-3.0p0 on Slackware64-14.1

Hello!
I can safely say that after an interesting series of steps I can now
run the current release on this laptop as its also running
Slackware64-14.1 via an external Flash device.

Those steps involved having to make sure that the underlying library
was properly made and installed. And to make sure that the routines
needed to install everything also worked.

Currently I have the webserver running.

As for making a DS2423 chip work, I've found online the necessary
hints to enable it to count properly, both with a switch in the on
position and then its off one. It seemed that my search talents
worked, this time.
-----
Gregg C Levine gregg.drwho8 <at> gmail.com
"This signature fought the Time Wars, time and again."

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Gmane