I've been bored lately, needing a break from another project I've been working on for quite some time... so I went digging around my samples box, and came up with the MAX1668.
I received a few samples of the MAX1668 a few years back, for another project that is so far on the back burner, well… anyway.
The MAX1668 is a 5 channel centigrade temperature sensor. It sports one internal temperature probe and four external probes. The external probes are diode-connected transistors, opposed to thermisters or temperature to voltage converts like the lm35.
**broken link removed**
So, I threw a small project together to feel this thing out, and wound up with another involved project.
I plan to interface the probe with a large VFD to make an indoor/outdoor temperature readout of sorts.
I have a write-up with a ton of pictures typed up... check it out:
Gordon , it looks great..
one pic didnot come out though. https://projects.dimension-x.net/pictures/techproj/max1668/max1668_2.jpg
i havnt finished it yet but i just thought i would let ya know..
thats wierd , when i clicked on the pic just above it comes up, but it still shows a red on the site.. wierd..
that is strange a picture is not loading for you ... hopefully it is just one of those random internet things that will clear up. I don't see any errors in the server log regarding that picture (or any picture)
anyway, here's a taste of whats to come ... need to sleep on a user interface and some features.
I've started envisioning what I want to do with this system.
I'm thinking I'll make a super indoor/outdoor data-logging thermometer.
These probes are kinda expensive ... I found them on Newark and Digikey, for nearly $10, I have two samples, so I'll probably build two thermometers instead of a single thermometer with 8 (external) channels. I guess I could get two more samples
Anyway, I'm thinking the thermometer needs a clock and a seeprom (or maybe a small SD) for storing data, a menu driven user interface for setting the clock, changing settings and reviewing the data.