Date: Wed, 06 Aug 2003 08:15:05 -0500 From: Jim King <jim@jimking.net> To: patpro <patpro@patpro.net> Cc: freebsd-hardware@freebsd.org Subject: Re: temperature acquisition on FreeBSD Message-ID: <3F30FF59.4060301@jimking.net> In-Reply-To: <D8C40B16-C7EB-11D7-BB40-003065CDEB78@patpro.net> References: <D8C40B16-C7EB-11D7-BB40-003065CDEB78@patpro.net>
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patpro wrote: >>> What I would do today is continue to use the Dallas Semiconductor >>> temperature probe devices and just drive them from the Dallas >>> 1-wire to RS-232 serial port adapter. You'll need some additional >>> software to discover, address, fetch and convert measurements from >>> each of the probes as compared to the Spiderplant box. >>> >>> As far as software, you can start with /usr/ports/comms/mlan or >>> /usr/ports/comms/mlan3 to talk to the adapter. >> > > > If I understand well, you're talking about this device : > > https://store.ibutton.com/cgi-bin/ncommerce3/ > ProductDisplay?prrfnbr=2531&prmenbr=776 That's the one (DS9097U). > But it looks like one can only plug 1 probe, and by the way, I can't > find simple temp probes. > The starter kit looks good > (http://www.ibutton.com/ibuttons/1921Kit.html) but the DS9097U-S09 > has no addressable 1-Wire chip onboard. And it seems it uses TMEX > driver, so I'm not sure mlan or mlan3 freebsd ports can read data > from it. DS9097U is just an adapter to allow you to plug a 1-Wire bus into an RS232 port. > Thermocron looks really good too > (https://store.ibutton.com/cgi-bin/ncommerce3/ > ProductDisplay?prrfnbr=2438&prmenbr=776) and is apparently supported > by mlan : Thermochron would be more expensive. They're $25 each; a plain temperature iButton is $7, and bare DS1920s are probably a lot less than that. Also, DalSemi has had major problems producing Thermochrons and quantities have been pretty limited for the last couple years. (A Thermochron is a nifty toy to have though - I've had fun with mine.) > So now, will TMEX driven hardware work on FreeBSD with mlan ? and > does anybody have experience pluging more than one temp. probe on > the DS9097U adapter family ? The DalSemi 1-Wire bus is really a bus - if you want more devices you just wire them onto the bus (i.e. connect them in parallel with the other devices). fyi, I played with mlan3 a little bit. I connected one of the DS1920 probes from my Spiderplant HLT into a DS9097U, and the 'temp' program from mlan3 worked fine and was able to display temperature readings from the probe. Jim
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