[oopic] Re: Cooling control system

--- In oopic@yahoogroups.com, "rtstofer" <rstofer@...> wrote:
>
> --- In oopic@yahoogroups.com, "cha_aman" <popa-r@> wrote:
> >
> > I'm looking at using an oopic to monitor temperatures and
activate a
> > cooling/heating system as required, and to display system status
> >
> > Temps monitored will be:
> > Averaged Ambient External (2 samples)
> > Averaged Internal Ambient (2 samples)
> > Averaged Internal Core (2 samples)
> >
> > the H/C system will attempt to maintain an even temperature
> >
> > the display:
> > Will consist of colored LEDs arainged into a 4x4 grid
> > General temp (hot, warm, good, cool) for each of the monitored
temps
> > and whether the H/C system is heating, idling, off, or cooling
> >
> > I was wondering if anyone had suggestions about boards to use or
how
> > to configure them (I'll worry about programming later, have to
> > decide on layout and components first)
> >
> > I was planning on using a seperate display board that would link
to
> > the temp controller. Do I need a seperate board to collect and
> > weight the samples, or am I overlooking anything?
> >
>
> I would wander over to Maxim (www.maxim-ic.com) and find some SPI or
> I2C based LED drivers. Maybe the MAX6966 is a candidate. Using
these
> devices will allow you to drive the LEDs without taking up all the
IO
> pins of the OOPic.
>
> As a practical matter, the R board is handy but you can't get to 6
A/D
> inputs. I would use the S board and buy an RS232 level changer for
> the serial port: http://www.pololu.com/products/pololu/0126/

Or use
> their design on your own board. The S board really just uses a 40
pin
> DIP package. No reason not to dump the board and keep the chip and
> EEPROM. But the board is a nice way to prototype.
>
> You biggest problem will be temperature sensors with an output that
is
> meaningful over the temperature range of interest while producing an
> output voltage that swings over a large part of the 0-5V input range
> of the A/D port. You will have to do some research on sensors and
> their output swings. You can offset and rescale the sensor with a
> single op amp using the information in Chapter 4 of "Op Amps For
> Everyone" http://www.ti.com/litv/pdf/slod006b
>
> Richard
>

Thanx, I'll do a little research and see what I can come up with.
Anymore ideads? Keep 'em coming!

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