home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!gatech!usenet.ins.cwru.edu!agate!dog.ee.lbl.gov!hellgate.utah.edu!cc.usu.edu!slh1y
- From: slh1y@cc.usu.edu (Jay Cliburn)
- Newsgroups: comp.sys.ibm.pc.hardware
- Subject: Re: Temp sensor with PC interface?
- Message-ID: <1992Nov10.074004.60602@cc.usu.edu>
- Date: 10 Nov 92 07:40:04 MDT
- References: <1992Nov2.092127.60298@cc.usu.edu> <1992Nov4.133127.739@blurt.oswego.edu> <1992Nov9.184756.2304@pt.com>
- Organization: Utah State University
- Lines: 31
-
- 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
-