On 02/03/2012 02:16 PM, p4trykx wrote: > Dnia 03-02-2012 o 22:47:26 Mick Sulley<m...@sulley.info> napisał(a): > > I was also thinking about this sensor it has a digital output which can be > connected to uC. There is also DHT22 which has greater range. From what I > read these are based on a capacitor which capacitance is based on > humidity. I wonder how long do they live. I've read that some types of > sensor wear out after about 5 years. > > >> Thanks for that Eloy, I suspected that would be the case. I would be >> interested to hear your experiences with it when it goes into your >> 'production' environment. > I'm also looking forward to see it. > > These devices are usually fairly rugged. The capacitive humidity sensors are used in automotive settings and can take quite a bit of abuse. One manufacturer was telling me that the required tests including repeated cycles of freezing the part and then immediately dipping in in very hot oil. ouch!
Generally anything with significant failure rates in less than 5 years are not acceptable in automotive environments. Most things other than replaceable parts require a 10+ year average expected life in that market. I have two 15+ year old cars, so I am beginning to worry. (in case you had any doubt, I am a sensor geek.) jerry ------------------------------------------------------------------------------ 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
