1-wire info and recommendations

Gina · **Posted:** Tue Nov 23, 2010 2:11 pm

Useful site that

I've bought a book on weather stations, sensors and the 1-wire system http://www.amazon.co.uk/gp/product/0470040467/ref=oss_product which uses the HobbyBoard modules modules and kits in their examples. From a quick look through it (only came this morning) it seems to be a useful book

OK I dare say all the info is on-line but a book is easier to read.

steve · **Posted:** Tue Nov 23, 2010 2:31 pm

Oooh - I've seen that book before and thought about buying it...

Gina · **Posted:** Tue Nov 23, 2010 3:30 pm

I think it's good value for a book. 450 pages. Covers general info about how weather is/was measured, shows a couple of weather stations including the Davis Vantage Pro 2 and goes on to talk about 1-wire principles, circuits and systems and the software to run them. It looks like 1-wire should be cheap and reasonably easy to implement. The latter will be a case of "the proof of the pudding is in the eating" :lol:

I have ordered a couple of things from HomeChip. Their prices seem very reasonable and ordering from their UK site avoids any problems with international delivery. I've ordered their low cost serial to 1-wire adaptor, some DS18B20 1-wire temperature sensors and a DS2450S+ 1-wire quad A/D converter. That should do to get me going

Synewave · **Posted:** Tue Nov 23, 2010 4:28 pm

Gina,

Remember your forum chums when you go to market and make £millions, won't you?

Gina · **Posted:** Tue Nov 23, 2010 5:56 pm

Synewave wrote:

Gina,

Remember your forum chums when you go to market and make £millions, won't you?

But of course

What a lovely thought :lol:

malc-c · **Posted:** Fri Nov 26, 2010 10:41 pm

I've just completed a project to maintain the temperatures in my reptile enclosures, this uses the DS18B20 one wire temperature sensor (well 4 actually as it's a multi channel device) which communicates to the PIC micro.

I used PicBASIC PRO to write the code for the PIC, but there are loads of other language examples on the net. I have been looking at the more expensive temperature / humidity sensors, but they use a different protocol and have two data lines (SLC and SDA). I did however come across one page I bookmarked which uses a cheap one wire sensor and PIC micro as a data logger to record temperatures and then upload them to a PC all in a neat package

Full details can be found http://www.compendiumarcana.com/datalog/

malc-c · **Posted:** Fri Nov 26, 2010 10:43 pm

Synewave wrote:

Gina,

Remember your forum chums when you go to market and make £millions, won't you?

Is that after it's cost nearly as much to get the thing fully tested to be able to sign off the CE declaration

Gina · **Posted:** Fri Nov 26, 2010 11:13 pm

malc-c wrote:

I've just completed a project to maintain the temperatures in my reptile enclosures, this uses the DS18B20 one wire temperature sensor (well 4 actually as it's a multi channel device) which communicates to the PIC micro.
---
Full details can be found http://www.compendiumarcana.com/datalog/

Thanks Malcolm, that's very interesting

I've bookmarked your link to study later.

I hope to be experimenting soon - my 1-wire stuff came today

malc-c · **Posted:** Fri Nov 26, 2010 11:37 pm

Gina,

Sounds like you're gonna have some fun... Those modules seem a good starting point... Whilst it's taken me around 9 months on and off to get my thermostat project to the stage it's at now, it's been fun taking the thing from the development board, through breadboarding, on to the stripboard prototype and finally to the stage where I designed the PCB and had half a dozen made in Hong Kong. I don't intend to retail them due to the costs and legalities of selling no CE marked items in the EU, but at least making up the remaining 5 units gives me the opportunity of recovering my costs by selling them to close friends, which according to trading standards is acceptable as it couldn't be classed as a business venture and thus doesn't need CE marking. However like all law it's open to interpretation, so if something did happen and it was one of my units at fault and I found myself before a judge, it would be dependent on what side of bed he /she got out of bed on the day

At the end of the day I set out to build myself a 4 channel pulse proportional thermostat with lighting controllers built into one unit -I've achieved that so I'm happy and anything more has been a bonus. I hope you get the same thrill and result with your project as I am with mine.

Gina · **Posted:** Fri Dec 17, 2010 10:59 am

Another useful link for 1-wire weather station sensors :- http://www.sensorsmag.com/sensors-mag/1-wire-addressable-digital-instruments-environmental-monitor-1065

1-wire is still a secondary project after getting my current system reliable - I think my anemometer froze up in the night, it's very rare to get so little breeze that it doesn't move at all in several hours (and the vane did). I'm building a thermostatic heater circuit for the rain gauge and looking into same for the wind sensors (as mentioned elsewhere).

I'm doing odd little bits towards 1-wire and following various links on-line to get myself into it. I have OWFS (One Wire File System) installed in Linux and it recognises both the ID in the serial to 1-wire adaptor and the ID in the temperature sensor chip so the hardware is working (as far as it goes). Next step is to sort out the software so that I can read the temperature. Once I get sorted out for temperature I can start adding other sensors. The latter seems quite straight forward. OWFS is also available for Windows so I expect my software solution to be multi-platform. It might also provide an interface that Steve could use to extend Cumulus to 1-wire. I would like to contribute to Cumulus if I can as thanks to Steve for the use of these forums.

Gina · **Posted:** Wed Dec 22, 2010 11:42 am

I now have a very simple 1-wire setup - serial adapter(DS9097U) and temperature chip(DS18B20) connected. Running on AMD64X2 system Linux Mint. I have installed OWFS (One Wire File System) which mounts all the sensors etc. as files and allows access to all their properties through simple file system commands. These may be manual through a terminal or using any programming language. (OWFS is free multi-platform software and available from SourceForge.)

Here is an example of access from the terminal :-

Quote:

gina@AMD64-Mint-9 ~ $ sudo cat /mnt/1wire/28.0F516B020000/temperature
17.375

And here is my complete terminal run including mounting the devices, listing their IDs and properites, and finally reading the temperature.

Quote:

gina@AMD64-Mint-9 ~ $ sudo /opt/owfs/bin/owfs -d /dev/ttyS0 /mnt/1wire
[sudo] password for gina:
gina@AMD64-Mint-9 ~ $ sudo ls /mnt/1wire
09.82CD79060000 28.0F516B020000 alarm bus.0 settings simultaneous statistics structure system uncached
gina@AMD64-Mint-9 ~ $ sudo ls /mnt/1wire/09.82CD79060000
address alias crc8 family id locator memory pages r_address r_id r_locator type
gina@AMD64-Mint-9 ~ $ sudo ls /mnt/1wire/28.0F516B020000
address crc8 family id power r_id temperature temperature11 temperature9 templow
alias errata fasttemp locator r_address r_locator temperature10 temperature12 temphigh type
gina@AMD64-Mint-9 ~ $ sudo cat /mnt/1wire/28.0F516B020000/temperature
17.375

The other device ID is in the serial adapter - they're available with or without ID.

I haven't used a high level language to access it as yet.

P.S. I created the directory /mnt/1wire first.

Gina · **Posted:** Wed Dec 22, 2010 12:40 pm

Trying to sort out permissions now so that I can use it as gina rather than root.

Gina · **Posted:** Wed Dec 22, 2010 8:13 pm

Not managed to sort out permissions but I do have temperature logging set up now using Python. The script reads the temperature and logs it to a text file together with the current date/time. This may be run as a cron job at whatever interval desired. Additional temperature sensors may be added easily and other sensors by simply replacing "temperature" with the appropriate property. The system will be highly modular.

Now to link the log file to GnuPlot to produce temperature plots like my F.O. station. I'll also do processing to produce plots over various time scales etc.

Gina · **Posted:** Thu Dec 23, 2010 10:14 am

Here's the link to the SourceForge page for OWFS giving details :- http://sourceforge.net/projects/owfs/
and OWFS home page :- http://www.owfs.org/

For MS Windows, OWFS runs under Cygwin :- http://en.wikipedia.org/wiki/Cygwin I hope to check out this implementation on my Windows XP machine once I have things running in Linux.

I also expect to test it in Mac OS X.

Gina · **Posted:** Tue Dec 28, 2010 11:11 pm

Just a minor update... I have connected the DS18B20 with about 10 metres of CAT5 cable to the adapter and placed the sensor outside. (I had a bit of fun persuading two wires from the CAT5 cable - blue for data and blue/white for ground - to go into the right holes in an RJ11 plug for crimping). The sensor end was soldered and the joints separated and protected with insulation tape. A proper job would be to encapsulate the connections in a thermosetting plastic. That would make the sensor weatherproof.

I tested this with the Python logger software mentioned above. It showed a nice smooth drop in temperature as the sensor cooled from room temperature down to the outside temperature.

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1-wire info and recommendations

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