Hi Mick, On 02/03/2012 04:23 PM, Mick Sulley wrote:
> Does anyone have any experience of the DHT11 temp/humidity sensor? I > just found it while looking for something else, it sounds very cheap for > a combined temp and humidity sensor, £2.75 on eBay, but I am not > convinced that it is compatible with 1-wire and owfs as I don't see any > address in the description. > > There is a description here > http://www.ladyada.net/learn/sensors/dht.html but my limited technical > knowledge can't determine if it would work or what else would need to be > done to get it to work. I have experience with the DHT11's older brother, the RHT03. Both work very similarly and as far as I know the only difference is price (one has better accuracy and temperature and humidity range than the other). Without a doubt, these guys do not speak Maxim/Dallas 1-Wire protocol; it's its own thing. I am working on a microcontroller-based 1-Wire slave that uses an RHT03 as the humidity/temperature sensor and it works great. I have not deployed one of these yet so I am not sure how well the RHT03 will work in a production environment (like in my garage, basement, or outside) but at least in inside tests it is looking pretty good. I'd say these cheap sensors are a great option, but you definitely need to hook them up to a microcontroller (it's not hard at all but it is not typical PC development). Cheers, Eloy Paris.- P.S. There are Arduino libraries to talk to these sensors so using an Arduino is an option if hardware development is not desired. The problem would be getting the Arduino to behave like a Dallas 1-Wire slave, though there is at least one GPL implementation out there that someone could use as a starting point. ------------------------------------------------------------------------------ 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
