Hakan, I had an episode (on a BBB with I2C connection) where for a couple of weeks the temperature resolution would randomly drop from 12-bit to 1/2 degree C. Looking at the owserver presentation of all of the various bit resolutions, sometimes the lower resolutions were not proper representations of the higher-bit values. I couldn't tell if some values were delayed, or just plain offset, but depending on which resolution happened to get written into my filesystem where my logger reads them, the temperature could appear to jump by 1/2 degree. I verified that the values in the filesystem files were being logged correctly. It would happen for a few minutes or a few hours, and then fix itself. And then without me doing anything at all, it just stopped happening!
Looking at your graph, it appears you usually get full resolution gradual changes on either side of your 1/2 degree steps. My graphs were always more like the later part of your blue line - chattering by 1/2 degree where there should have been a smooth transition. I have no clues why this started or stopped... | Loren Amelang | lo...@pacific.net | On Saturday, September 13, 2014 at 10:29 PM, owfs-developers-requ...@lists.sourceforge.net wrote: > 1. unruly temperatures (H?kan Elmqvist) > > ---------------------------------------------------------------------- > > Message: 1 > Date: Fri, 12 Sep 2014 17:18:53 +0200 > From: H?kan Elmqvist <hak...@smeden.org> > Subject: [Owfs-developers] unruly temperatures > To: "OWFS (One-wire file system) discussion and help" > <owfs-developers@lists.sourceforge.net> > Message-ID: <54130edd.5070...@smeden.org> > Content-Type: text/plain; charset="iso-8859-1" > > Suddenly my temperature readings have started to jump up and down about > 0.5 degree C at infrequent but random points of time. See: > http://smeden.org/jumps.jpg > (the green trace is the temperature of my watermaker, the blue sea- and > the red outdoor-temperature) > I have had this system since 2005 but not seen this behaviour before. > Today I am using owfs 2.9p5. The sensors are a mix of old and new ones. > Has anyone seen this behaviour? Is there any explanation? ------------------------------------------------------------------------------ Want excitement? Manually upgrade your production database. When you want reliability, choose Perforce Perforce version control. Predictably reliable. http://pubads.g.doubleclick.net/gampad/clk?id=157508191&iu=/4140/ostg.clktrk _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
