Unfortunately, I've had some experience with the HA7NET boxes... Based on some information that I'd received that indicated that there is a technical problem with most of the humidity sensors at low humidities, and the fact that the testing we do is at low humidities, we bought one HA7NET box and an HMP-2001s sensor.
The first sensor had problems at low humidities too.. so we talked to the manufacturer about it.. They indicated that they had a previously undiagnosed problem, and that they would fix it. They did.. and based on that, we ordered 5 more units/sensors. After we placed the order, they indicated that they were re-engineering the sensor.. and that it would be a little while before they would ship. We were willing to accept the delay, in exchange for the accuracy they promised. The specs were: +-.5% RH Linearity, an operating range extending to 100% RH, humidity stability at 50% RH of +-1% over 5 years. All of these were well within the tolerances we needed. It took over 7 months before the new sensors showed up... and when they did show up, they were worse than the pre-re-engineered sensors. When we went back to they for a fix.. we got told that there was likely a problem in the re-engineered firmware... and they'd let us know... Weeks went by and I could not even get a scheduled ship date. As of this morning, I'm being told that the outside source for the firmware is now offering the manufacturer a "non-commital" three weeks... Frankly, I'm not holding my breath on when they will get it fixed. It's really kind of sad. The problem looks to be as simple as a change in the slope of the calibration curve, from testing these sensors in a calibrated humidity chamber, that we have done.. but, apparently, because the software was outsourced, it looks like Embeded Data Systems hands' are tied. This could be a really neat product. I wish Embedded Data Systems would make a few changes.. 1) do power over ethernet.. doing so would permit the HA7Net box to be at the end of the ethernet cable, with no need for a wall wart and 2) would open-source the software so others could work on the problems with it.. If so, I think it would go like gangbusters. Look at the success Linksys has had with the WRT54 series of boxes, at least in part driven by the demand for a platform on which to put open source solutions, like Asterisk VOIP and OWFS! I made one, half-hearted attempt to get OWFS running with the HA7NET and tossed in the towel. I've moved to Dan Klein's thermd because it's easier to maintain the config files. I still think OWFS has a lot of uses.. so I keep watching the developemnts here.. but I can't speak for the OWFS-HA7Net connection because I haven't given it a "fair shot". I may take another look at it when I get some time. IF you stay in the middle range of humidities, you would probably be happy with the HA7Net... but if you need to go down into the lower range.. you had better be prepared to wait, (and wait and wait and wait) for a solution from Embeded. Steve [In a message on Thu, 06 Dec 2007 18:44:40 +0100, ""Michael Weber"" wrote:] >Anybody has some experience with the HA7NEt device? Is it reliably >working with owfs? > >Michael > >------------------------------------------------------------------------- >SF.Net email is sponsored by: The Future of Linux Business White Paper >from Novell. From the desktop to the data center, Linux is going >mainstream. Let it simplify your IT future. >http://altfarm.mediaplex.com/ad/ck/8857-50307-18918-4 >_______________________________________________ >Owfs-developers mailing list >Owfs-developers@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/owfs-developers Steve ------------------------------------------------------------------------- SF.Net email is sponsored by: The Future of Linux Business White Paper from Novell. From the desktop to the data center, Linux is going mainstream. Let it simplify your IT future. http://altfarm.mediaplex.com/ad/ck/8857-50307-18918-4 _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
