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- From: gajdos@hpavla.lf.hp.com (Larry Gajdos)
- Date: Thu, 19 Nov 1992 14:40:10 GMT
- Subject: Re: Temp sensor with PC interface?
- Message-ID: <45660009@hpavla.lf.hp.com>
- Organization: Hewlett-Packard Little Falls Site
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!cs.utexas.edu!sdd.hp.com!apollo.hp.com!cupnews0.cup.hp.com!nsa.hp.com!hpscit.sc.hp.com!scd.hp.com!hpscdm!hplextra!hpcss01!hpwala!hpavla!gajdos
- Newsgroups: comp.sys.ibm.pc.hardware
- References: <1992Nov2.092127.60298@cc.usu.edu>
- Lines: 39
-
- In comp.sys.ibm.pc.hardware, slh1y@cc.usu.edu (Jay Cliburn) writes:
-
- > I originally wrote:
- > >>> Can anyone recommend an ambient air temperature sensor which interfaces
- > >>> to a PC? It doesn't need to be very sophisticated or super accurate, I
- > >>> just want to use my computer to monitor the temperature in a room and
- > >>> report when the temperature exceeds limits.
-
- > Allen Mulvey <mulvey@blurt.oswego.edu> responded:
- > >>You should be able to rig a thermistor with an adjusting potentiometer
- > >>across a joystick analog input. You would probably have to write your own
- > >>software to monitor it.
-
- > And Kevin Chalker <kcc@pt.com> said:
- > > Radio Shack sells an electronic thermometer module (~$20) that allows you
- > > to program high/low temperature alarms. You could connect this output
- > > to a parallel port on your PC.
-
- > Both good ideas. Thank you. However...
-
- > I left out an important piece of information from my original post -- the
- > room(s) will be up to ~1000 feet from the computer. I believe this will drive
- > me to use an RS-422 interface tied to a serial port with software polling.
- > Can RS-232 devices be transparently connected to an RS-422 interface? Is
- > RS-422 a superset of RS-232? Can anyone recommend a 4-port RS-422 ISA-bus
- > compatible board? I've seen RS-232 temperature modules advertised in various
- > industrial computer application catalogs. Could I use one of these on an
- > RS-422 line?
-
- > Thanks.
- > --
- > Jay Cliburn jay@prometheus.idec.sdl.usu.edu
- > slh1y@cc.usu.edu
-
- Check out Analog Devices or Omega Engineering. I'm not sure how cheap they'd
- be but they would at least offer a serial interface (RS-232 for sure).
-
- Larry Gajdos
- not speaking for HP
-