Somewhat related to the "diagnosing disappearing devices" thread, I have also noted that sometimes my temperature readings go crazy. Example from a temperature log:
2013-11-05 04:31:10 ,Basement Fridge Thermometer, 7.125 2013-11-05 04:32:10 ,Basement Fridge Thermometer, 7.0625 2013-11-05 04:35:10 ,Basement Fridge Thermometer, 45 2013-11-05 04:36:10 ,Basement Fridge Thermometer, 40.5 2013-11-05 04:37:10 ,Basement Fridge Thermometer, 43.4375 2013-11-05 04:38:10 ,Basement Fridge Thermometer, 43.375 2013-11-05 04:39:10 ,Basement Fridge Thermometer, 45.3125 2013-11-05 04:40:11 ,Basement Fridge Thermometer, 45.875 2013-11-05 04:41:10 ,Basement Fridge Thermometer, 85 2013-11-05 04:42:10 ,Basement Fridge Thermometer, 46.125 2013-11-05 04:43:10 ,Basement Fridge Thermometer, 7.4375 2013-11-05 04:44:10 ,Basement Fridge Thermometer, 7.5625 2013-11-05 04:45:10 ,Basement Fridge Thermometer, 7.6875 2013-11-05 04:46:10 ,Basement Fridge Thermometer, 11.1875 2013-11-05 04:47:10 ,Basement Fridge Thermometer, 11.375 2013-11-05 04:48:10 ,Basement Fridge Thermometer, 7.875 2013-11-05 04:49:10 ,Basement Fridge Thermometer, 10.4375 2013-11-05 04:50:10 ,Basement Fridge Thermometer, 10 2013-11-05 04:51:11 ,Basement Fridge Thermometer, 43.1875 2013-11-05 04:52:10 ,Basement Fridge Thermometer, 46.25 2013-11-05 04:53:10 ,Basement Fridge Thermometer, 45.75 2013-11-05 04:54:10 ,Basement Fridge Thermometer, 46 2013-11-05 04:56:10 ,Basement Fridge Thermometer, 46.875 2013-11-05 04:57:11 ,Basement Fridge Thermometer, 7.5625 2013-11-05 04:58:10 ,Basement Fridge Thermometer, 9 2013-11-05 04:59:10 ,Basement Fridge Thermometer, 85 2013-11-05 05:00:10 ,Basement Fridge Thermometer, 85 The logging is supposed to happen every minute so any minutes with no logs means the temperature data was invalid (probably null). But then there are readings like these three: 2013-11-05 04:41:10 ,Basement Fridge Thermometer, 85 2013-11-05 04:42:10 ,Basement Fridge Thermometer, 46.125 2013-11-05 04:43:10 ,Basement Fridge Thermometer, 7.4375 I know for certain there is no way the temperature inside the fridge went from 85 C to 7 C in two minutes! So what is going on here? Is this a problem with a rampant device on the wire, or the reader (a DS9490), or owfs? If the values are checksumed then this seems like a software issue since any corruption of the data on the wire should have failed the checksum and been flagged as invalid. Also, in case it helps, other 1wire sensors, including a family 10 sensor, also get crazy readings so this is affecting multiple sensors. Any guidance on resolving this would be appreciated. Thanks, Jeff ------------------------------------------------------------------------------ November Webinars for C, C++, Fortran Developers Accelerate application performance with scalable programming models. Explore techniques for threading, error checking, porting, and tuning. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60136231&iu=/4140/ostg.clktrk _______________________________________________ Owfs-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/owfs-developers
