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From: bc338569@longs.LANCE.ColoState.Edu (Brian Catlin)
Newsgroups: sci.electronics
Subject: Re: Temperature Probes
Message-ID: <13988@ccncsu.ColoState.EDU>
Date: 4 Apr 91 18:30:48 GMT
References: <1991Apr1.130656.29392@kuhub.cc.ukans.edu> <9247@sail.LABS.TEK.COM> <1991Apr4.003110.4141@csis.dit.csiro.au>
Sender: news@ccncsu.ColoState.EDU
Reply-To: bc338569@longs.LANCE.ColoState.Edu.UUCP (Brian Catlin)
Organization: Engineering College, Colorado State U.  Ft. Collins, CO  80523
Lines: 25

In article <1991Apr4.003110.4141@csis.dit.csiro.au> ken@csis.dit.csiro.au (Ken Yap) writes:
>While we are on temperature probes, has anybody dissected one of those
>cheap digital indoor/outdoor thermometers made by Micronta and sold by
>Radio Shack, but probably sold under many other brand names? I notice
>that the PCB has contacts for additional buttons. Two seem to be for
>min and max readings.

  I've taken several of these apart.  If I can remember right, it has sixteen
  pins on it.  These pins are ground, positive, high temp, low temp, memory,
  alarm on/off, high temp out, low temp out, alarm out, set alarm, piezo buzzer
  out, C/F select, and some others that I can't seem to remember.

  We use these to run fans and heaters in our greenhouses and they are pretty
  good for this.  They not only have min/max temperature memories, but they
  also have alarm outputs that can run LEDs or relays to run larger loads.
  The piezo buzzer output connects to (you guessed it) a piezo buzzer.  This
  buzzer sounds any time either the min or the max alarm temperature is reached.
  It comes with a small paper that shows all of the connections and it shows
  how to add LEDs to the three outputs.  Sorry, no serial outputs though.

  Hope this helps!

  B. J. Catlin

  bc338569@longs.lance.colostate.edu