Hello Heimo, after writing to "simultaneous" you have to wait one second.
For Python I would recommend you the library *pyownet *by Stefano Miccoli: > The official OWFS bindings are > > - OW.py, based on SWIG wrapping the C API of libow > - ownet.py, pure python owserver client > > you will find both in debian packages > > - python-ow, https://packages.debian.org/buster/python-ow > - python-ownet, https://packages.debian.org/buster/python-ownet > > My advice is to avoid the use of these packages with python3 (although > python3 versions exist in debian) since they are not actively developed. > > I’m the author of pyownet, a different package, which does not belong > to the official OWFS code base. It is documented at > <https://pyownet.readthedocs.io/en/latest/> and is available only > on pypi.org <http://pypi.org> since, to my knowledge, it is not > packaged by any major linux distribution. > > pyownet is actively mantained, and is perfectly compatible with both > python3 (up from 3.3) and legacy python2 (2.7 only). > > So if you “import pyownet” in your code you have to “pip install > pyownet”. The discussion in this thread is whether it is a good > practice to “sudo pip install pyownet” along the python packages > distributed by debian. In my opinion you should avoid this, and > instead use a virtual environment, as I tried to explain in my messages. > > Bye > > Stefano On 13.03.20 17:05, zeitvertreib.wiss...@web.de wrote: > Hello Jan, > > I'm sorry, you are right. > I do not use bash commands, I do read and write operations from a > Python3 program. I do it step by step, as I'm not used to Python. > I had a version with uncached, but there was another program error and > I forgot adjusting the file path. > > PATH = "/mnt/1wire/bus.0/" > > *initiation of conversion:* > > while True: # Hauptprogramm > t1 = time() > fw = open(PATH + "simultaneous" + "/temperature", "w") > fw.write("1") > fw.close() > > > *reading values:* > > for i in tempList: > deviceFile = PATH + "uncached/" + temps[i] + "/latesttemp" > f = open(deviceFile, "r") > tempBuffer = float(f.read()) > f.close() > if tempBuffer != 85.0: > tempw[i] = tempBuffer > print(temps[i], tempw[i]) > break > t2 = time() > print(t2 - t1) > > However, now I wonder about very short conversion times, shorter than > 700 ms a single 12bit conversion shoul take. > > 1st run: > > 28.0A651B2D1901 26.625 > 28.0A35192D1901 22.875 > 28.0CB479A20003 21.75 > 28.8BE0182D1901 28.875 > 28.80A7112D1901 29.5 > 28.629B082D1901 22.75 > 28.953D062D1901 22.875 > 28.613079A20003 22.25 > 28.CF52142D1901 22.8125 > > 1.3515775203704834 sec > > following runs > > >>> %Run TempLesen.py > 28.0A651B2D1901 22.9375 > 28.0A35192D1901 22.9375 > 28.0CB479A20003 21.75 > 28.8BE0182D1901 23.125 > 28.80A7112D1901 23.125 > 28.629B082D1901 22.75 > 28.953D062D1901 22.875 > 28.613079A20003 22.25 > 28.CF52142D1901 22.875 > > 0.6546370983123779 sec > > no matter whether Thonny or Bash. > > Is there a Python3 library for RaspberryPi > > Actually there is a problem when installing OWFS on Raspian Buster on > PIs. File system an sensors appear in duplicates. I give you a link to > the forum of the manufacturer of the used DS2482-100 adapter: > > https://www.abelectronics.co.uk/forums/thread/303/owfs-duplicates > > Regards > H. Wissing > > > > Dr. med. habil. Dipl.- Ing. Heimo Wissing > Privatdozent, Arzt für Anästhesiologie, > Intensivmedizin und Schmerztherapie > Bioingenieur / Biomedizinische Technik > Neckarweg 1, 69118 Heidelberg > Tel.: 06221/801679 FAX: 06221/803738 > mobil: 0171/4571292 > > > *Gesendet:* Freitag, 13. März 2020 um 15:48 Uhr > *Von:* "Jan Kandziora" <j...@gmx.de> > *An:* owfs-developers@lists.sourceforge.net > *Betreff:* Re: [Owfs-developers] How to Use Simultaneous > Am 13.03.20 um 15:12 schrieb hwissing: > > Hello, > > > > I think one issue from the primary question is not answered.. > > > > /" If I read from '/temperature' then I get them read in much faster > > *but I don't get a fresh conversion each time."*/ > > > This is a very old question, and the mechanism has changed a bit since > 2008. > > > > > > > I have the same issue. First conversion with 8 DS18B20 sensors takes > > about 1 sec, immediately following requests take about 40 ms, but > > values are not updated. It takes a while till updated values are > > acquired, then conversion takes longer. > > > That is because you read /<ID>/temperature instead of > /uncached/<ID>/temperature > > But don't do this either. If you want simultaneos conversions, do instead > > $ owwrite /simultaneous/temperature 1 > $ sleep 1s > $ owread /uncached/<sensor0id>/latesttemp > $ owread /uncached/<sensor1id>/latesttemp > $ owread /uncached/<sensor2id>/latesttemp > $ owread /uncached/<sensor3id>/latesttemp > $ owread /uncached/<sensor4id>/latesttemp > $ owread /uncached/<sensor5id>/latesttemp > $ owread /uncached/<sensor6id>/latesttemp > $ owread /uncached/<sensor7id>/latesttemp > > Latesttemp has the resolution of the previous non-simultaneous > conversion, or, after power-up of the sensor, the resolution set in the > sensor's EEPROM. You can adjust the through /<ID>/tempres. > > See the manpage: https://github.com/owfs/owfs-doc/wiki/DS18B20 > > Kind regards > > Jan > > > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers > > > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers
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