Hi Paul, I'm sorry - I cannot locate the 'errata' directory. Am using OWFS 2.7_p21-r1.
Phil On 24 January 2013 21:35, Paul Alfille <[email protected]> wrote: > In general, the DS18B20 should not need calibration. The usual reason for > differing temperatures is either different environment or self-heating. > > There was a manufacturing problem with the sensors in the past losing > calibration data -- specifically the "B7" lot. There is some data in teh web > site and properties exposed under the /errata/ directory for reading and > setting the calibration data. I have no idea if this can also be used to > more precisely calibrate a given sensor. > > See: > http://www.1wire.org/en-us/pg_15.html > http://www.elektroniikka.org/thermometer/bin/app247.pdf > > On looking up the B7 problem, I came upon a C2 die problem as well -- one > that looks easy to fix: > http://osdir.com/ml/hardware.one-wire.weather/2005-11/msg00045.html > > Can you tell me the die version of the chips (under the errata directory) of > your chips? > > Paul Alfille > > > On Thu, Jan 24, 2013 at 2:22 PM, Phil White <[email protected]> wrote: >> >> Hi All, >> >> I have 30 temperature sensors sitting in front of me at the moment. >> They all report different readings when queried - which I would like >> to fix on a reasonably permenant basis. >> >> Can someone advise how I go about calibrating them? There is, as far >> as I remember, a register I can save into, and I have seen calibrated >> sensors for sale (but can't afford this option) - yet I have no idea >> on the procedure to DIY. >> >> Many thanks, >> >> Phil >> >> >> ------------------------------------------------------------------------------ >> Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, >> MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current >> with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft >> MVPs and experts. ON SALE this month only -- learn more at: >> http://p.sf.net/sfu/learnnow-d2d >> _______________________________________________ >> Owfs-developers mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/owfs-developers > > > > ------------------------------------------------------------------------------ > Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, > MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current > with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft > MVPs and experts. ON SALE this month only -- learn more at: > http://p.sf.net/sfu/learnnow-d2d > _______________________________________________ > Owfs-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/owfs-developers > ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnnow-d2d _______________________________________________ Owfs-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/owfs-developers
