[TriEmbed] Coffee roaster

[Shane Trent]

Craig,

A hot air roast should take much less than 30 minutes. It was cool this
morning and I roasted two batches, both to medium City Roast (just past the
end of the first crack), and each was less than 6 minutes. I am using a
vintage unit but have had similar performance from other devices. It sounds
like your old air-popper may have had a temperature limit that kept it from
getting hot enough. I did have one popper model that I had to hack into and
bypass the low-temperature thermostat (but it still seemed to roast slow
and did not last as long a unmodified units). In an air popper the roast
should happen so quickly that it is easy to keep an eye on it.

I put some notes about my current roasting/cooling setup into a blog post.
My controls over the roaster are adjusting the recirculation of heat to
increase the temperature of the air going into the popper and controlling
the ventilation with a bilge blower. I think the photos show most of the
details. I hope it makes sense. Ping me if you have any questions.

http://fettricks.blogspot.com/2018/10/roasting-coffee-with-hot-air-poppcorn.html

Shane


On Wed, Oct 24, 2018 at 7:53 PM Craig Cook via TriEmbed <
triembed at triembed.org> wrote:

> I have been using this
> https://smile.amazon.com/gp/product/B00XK3ALS0/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
> for the last 8 years roasting green beans.
>
> That has the side vents, takes ~30 mins to roast.  Works *really* well.  I
> burned the motor out 2 weeks ago. It's discontinued.  Thought I should
> migrate to an arduino based version, hence my questions and asking for
> advice on what parts I should purchase.
>
> Yes, after the roast I dump the beans into a cooling basket.
>
> I have one of these to replace it:
> https://www.gopresto.com/product/presto-poplite-hot-air-corn-popper-04820
> https://smile.amazon.com/gp/product/B00006IUWA/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
>
> Given that new information, would it change the proposed design?
>
> It will be much better if I can control the roasting process though.
> Without control I get a few over roasted beans.
>
> Thanks for everyone's help.
>
> Craig
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