PID Corretto

[Dimal]

Re: PID Corretto

It would be a fairly straight forward Mod to do but to get the best out of your Corretto, youd need a slightly higher spec controller..... one that has the capacity to introduce several ramp/soak stages through the roast cycle and then to take it a step further, a controller with comms capability as well to allow you to store and run Roast Profiles.

Other than that, the installation side of things is not that dissimilar to installing a PID controller to a Silvia, etc. I suppose if someone had the time and resources to do it (a la Jims Silvia PID Kits), a standard kit could be assembled, programmed and packaged for use on pretty well any kind of roaster with slight differences depending on the heat source intended.

Mal.

[Corretto]

Re: PID Corretto


Yes, it does look great indeed.

So can anybody perform this mod?

Re: PID Corretto

Fantastic stuff mate, cant wait for the result.  


MZ.

[wrstikoff]

Re: PID Corretto

I reprogrammed the roaster to roast for longer. Roast profile attached below.

Now just need to wait to try it I guess

[wrstikoff]

Re: PID Corretto

Great work! I too have been thinking of similar. Do you have any details on your black box? Also can you cut the heat and leave the fan to cool the beans? If so does it cool reasonably quickly?

I must confess - the black box was designed and built by brother so I cannt help to much there. He is working on a MKII with a more powerful chip, Im looking forward to playing with that.

Yes the fan continues to run at the end of roasting but it does not cool down very quickly, after about 1 minute the beans get down to around 200. I usually let it run on fan only for around 10 seconds then dump them and cool on my cooling setup (vacuum cleaner, bucket and stainless mesh spatter guard)

[wrstikoff]

Re: PID Corretto

very impressive - nice work indeed......   only Id push your roast a little longer to 16-18 minutes.. so hitting 230-240deg at around 15mins bringing on 2nd crack...  as a general rule anyway...

Some of my roasts hit 18-20mins...

I am limited at the moment to about 14 minutes total roast profile. It is a memory limitation of the chip. The temerature profile is defined in 10 second steps, maybe by making the steps 20 seconds I can double the roast profile time. I think it will still give good enought contol. I have been toying with this one for a while.

[andrew]

Re: PID Corretto

that is really cool.

[dkelly60]

Re: PID Corretto

Great work! I too have been thinking of similar. Do you have any details on your black box? Also can you cut the heat and leave the fan to cool the beans? If so does it cool reasonably quickly?

[marcstolk]

Re: PID Corretto

very impressive - nice work indeed...... only Id push your roast a little longer to 16-18 minutes.. so hitting 230-240deg at around 15mins bringing on 2nd crack... as a general rule anyway...

Some of my roasts hit 18-20mins...

[wrstikoff]

Re: PID Corretto

This is BRILLIANT !!

I love it. I want one. [smiley=beer.gif]

Is the fan in XUI HG able to be varied minutely with the controller?

That profile looks pretty good. How do you design/edit it?


Belinda

Hi Belinda,

I didnt make any allowance for varying the fan speed although I could when the heat gun was used in its fluidised bed roll.

The profile is set up in excel and download via realterm. I have posted the file if anyone is interested. The spreadsheet interacts with realterm via a macro.

[Corretto]

Re: PID Corretto


Actually see: http://picasaweb.google.com/DavidLPaget/PIDCorretto for better photos etc

[JavaB]

Re: PID Corretto

wrstikoff,

Great project. [smiley=thumbsup.gif]

Ive been doing a similar thing (but using my brain rather than a PID) for Corretto roasting for some time now.

The heatgun I use has two elements (Ryobi) - one produces 60C heat and is used as a voltage dropper for the fan - the other is the 2000W actual heater.

I opened the heater circuit and inserted a triac controller... so that I could alter the power to the heater smoothly as required - and left the second element to power the fan ( no need for a transformer)....

I just monitor the temperature of the beans (with the datalogging meter) and alter the power to the heater by small amounts to follow the desired profile. The PID would close this feedback loop much better (well a lot less human involvement at least ).

Where have you located the thermocouple in the bowl?

[Corretto]

Re: PID Corretto

This is BRILLIANT !!

I love it. I want one. [smiley=beer.gif]

Is the fan in XUI HG able to be varied minutely with the controller?

That profile looks pretty good. How do you design/edit it?


Belinda

[wrstikoff]

Re: PID Corretto

Finally, first roast profile and data capture.

[wrstikoff]

Re: PID Corretto

Mods to heat gun. I replace the 2 core power lead with a four core one so it still looks neat.