From: email@example.com (James Osborne)
Subject: Re: Need help designing a circuit...
Date: 16 Jan 2003 16:08:52 -0800
NNTP-Posting-Date: 17 Jan 2003 00:08:52 GMT
Without reading most of the replies I would offer this advice. Use one
of Texas Instruments latest micro-controllers such as the MSP430F149.
They are design for exactly this type of application. Some have
display segment controls with 14-bit A/D.
"Innes Cathcart" wrote in message news:...
> Why don't you just let the animal go free? Why would anyone wish to
> imprison a live being? Did it commit a crime worthy of imprisonment? :)
> "ryanm" wrote in message
> > Ok, I'm handy with mechanical things and have a basic understanding of
> > electronics and can read a schematic, but when it comes to circuit design,
> > don't even know where to begin. I need a fairly simple circuit, consisting
> > of an LED or LCD display, a thermistor, and some kind of humidity sensor,
> > both on about a 5' length of wire. To start at the beginning, I'm building
> > an animal enclosure and need to monitor the temperature and humidity
> > the enclosure. I have looked for a consumer-level product that does what I
> > need, but no one seems to make one, and the higher-end panel mount
> > indicators start at about $85 for temperature and $120 for humidity, which
> > is way too much for $25 worth of parts.
> > So, basically, what I need is a circuit that will monitor two probes
> > twice per second and return the values to an LCD. I can handle any
> > needed, I know Java, VisualBasic, and C++, so even if I don't know the
> > language it needs to be written in I can figure out enough of it to hack
> > some code together for it. Any help, suggestions, references to premade
> > schematics online, etc, are appreciated.
> > Thanks,
> > ryanm