Yes good points, desk lamp is not an issue but I guess it could be a voltage reg issue. I have also just discovered that my wiring does not supply +5 to the sensors, which I thought it did. Need to review that and test again, but that's a job for tomorrow, it's getting late now!
Mick On 27/02/12 23:16, p4trykx wrote: > Dnia 27.02.2012 o 23:58 Mick Sulley <m...@sulley.info> Mick Sulley > <m...@sulley.info> napisał(a): > >> The 4 DS18S20's read 18.3125, 18.625, 18.675 and 18.125, so all within >> half a degree. > > I was wondering if this error is persistent? If I put all my sensors > in one > place take readings and calculate each sensor's deviation from average. > Will this deviation be the same over time and in different places? > >> The Humidity sensor box has a built in DS18S20 which reads 22.25 and >> also the humidity sensor itself has a temperature register which >> reads 23.5. >> It seems odd to me that although the 4 separate sensor agree, both the >> temperature readings in the humidity sensor are several degrees higher. >> Any ideas why this should happen? > > Maybe the voltage regulator generates some heat and transfers it through > the copper paths in the board? > Unplug the sensor for ~15 min. and then plug it and quickly take > readings. > > Maybe your desk lamp heats up the sensor? > > > ------------------------------------------------------------------------------ Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
