pic microcontroller discussion list wrote:
> It seems that I'll start my tests with a no-frost deep-freezer that =
my
> fridge has (~18=B0C) and for the heat, I'll use my wifes blow
> dryer.  And go
> from there...
>=20

I'll offer another suggestion. The home brewing industry has these
little temperature controllers for around $150 or so. You turn your
freezer to the coldest temperature, but the freezer is plugged into
the temperature controller. The controller turns the freezer on or
off as required. It can be set for heating or cooling IIRC. So,=20
there's the cooling side already taken care of.

For heating, you could dismantle a toaster oven and mount the coils
on a suitable bracket to the inside of the freezer so the plastic
doesn't melt. Unplug the freezer, and plug in the oven coils
instead.=20

It should also be simple to build a PIC circuit that could control
both heating/cooling at the same time; using ready-made components
would allow you to quickly test the feasability of this=20
concept.

Phil Eisermann
Electronics Engineer
The Ridge Tool Company
(440)329-4680

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