Re: [Owfs-developers] 18B20 Calibration

2013-01-26 Thread Paul Alfille
I think the "dire" and "trim, etc have been there for quite a while, but only gathered into the "errata" subdirectory in 2009 (to clean up the directory display for very rarely used and confusing entries). In fact the change was right around when your version was released. On Fri, Jan 25, 2013 at

Re: [Owfs-developers] 18B20 Calibration

2013-01-25 Thread p4trykx
W dniu 25.01.2013 o 23:48 Phil White pisze: > Hi Paul, > > I'm sorry - I cannot locate the 'errata' directory. > Am using OWFS 2.7_p21-r1. I have 2.8p21(latest) and there is errata directory I think it's a recent feature. So you have to compile some more recent version. -- p4trykx ---

Re: [Owfs-developers] 18B20 Calibration

2013-01-25 Thread Phil White
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 wrote: > In general, the DS18B20 should not need calibration. The usual reason for > differing temperatures is either different environment or self-heating. > > The

Re: [Owfs-developers] 18B20 Calibration

2013-01-24 Thread Jerry Scharf
On 01/24/2013 11:22 AM, Phil White 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

Re: [Owfs-developers] 18B20 Calibration

2013-01-24 Thread Paul Alfille
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

[Owfs-developers] 18B20 Calibration

2013-01-24 Thread Phil White
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,