From: Gary Tait
Subject: Re: Need help designing a circuit...
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Date: Wed, 15 Jan 2003 16:43:48 -0500
NNTP-Posting-Date: Wed, 15 Jan 2003 16:46:20 EST
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On Wed, 15 Jan 2003 14:16:09 -0600, "ryanm"
> 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, I
>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 within
>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 component
>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 software
>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.
The circuit is rather simple too, or findable, just inteface the
analog enviroment sensors to the ADC of the micro (choose a micro that
has an ADC, or use and external ADC). You could do it is Assembler,
C, or even Basic (if the chip you choose has a Basic compiler)