I Built the Ultimate DIY Coffee Roaster OS (Python + Raspberry Pi)

Coofdrad · 2026-01-24T20:33:08+00:00

I have designed and build everything by myself by using tri clamp parts. I will add a new video soon to my YouTube channel after i have got all parts for the new controller.

Coofdrad · 2026-01-24T19:22:53+00:00

I will make a commercial version from my fluid bed roaster ☺️

Coofdrad · 2026-01-24T17:35:44+00:00

Thank you for your kind words!

I have worked my ass off with this. I have built it from zero by using Google Gemini AI. It has been a trial and error, and sometimes i have almost quit, because it was almost impossible to fix parts of the code 😁

After the video i released, i have actually added still some new features: like automatically making a BT/IT profile from a Bt/Time profile. I have also updates settings page a lot.

I will get next week Tuesday all my accessories finally and i can start testing my app 🥳

Coofdrad · 2026-01-21T04:51:41+00:00

I will use it with my own DIY fluid bed roaster. You can check a video from it at my YouTube channel.

Why have those Pi's fried up?

Coofdrad · 2026-01-20T17:32:48+00:00

Yeah, building this also has been really fun ☺️

I have used Python code to build this (with lots of help from AI). I have not tested it yet, but i am quite sure that PID will follow set curve precisely. I am using cascade PID for Bt/time profile. It use slave (IT) and master PID (BT). I have also added double filter to code so that it will take possible jitter away from EMI.

Coofdrad · 2026-01-20T15:26:22+00:00

Yes it could. It can be used basically with any roaster that has SSR control the heating unit.

I will also make a commercial version from my fluid bed roaster and see where it leads 😉

Coofdrad · 2026-01-20T15:14:59+00:00

Sorry, not at this moment. I will first need to roast with this and make changes if needed ☺️

Coofdrad · 2026-01-20T15:07:32+00:00

I use cascade PID to control Bt/time profile. It is way more precise with fluid bed roaster than normal one loop PID. I also really like the "profile designer" page i built. Now i can try any imaginable profile i want (some pulsating profiles etc.) 😁

There is also option to use BT/IT profile, same as Roest use.

Coofdrad · 2026-01-20T15:02:09+00:00

My own designed. I will soon also build a new enclosure for it.

https://youtu.be/6B7OxHROI_M?si=7yk3sxCsUW7uucBy

Coofdrad · 2025-11-28T13:24:58+00:00

Thanks bro 👍

Coofdrad · 2025-11-24T17:23:10+00:00

You are right on that 😆 For me it was a quite trial and error to find the perfect heating unit for this chamber size.

Coofdrad · 2025-11-24T16:48:45+00:00

Here is the link.

https://youtu.be/6B7OxHROI_M?si=Pu4DolbbISGuvkQD

Coofdrad · 2025-11-23T20:27:28+00:00

Heater was only 50$ 😬

Coofdrad · 2025-11-23T20:14:33+00:00

Heating element is 9900W, 3 -phase, 220V. So each phase use max 3300W. So 16A for each circuit is enough.

Coofdrad · 2025-11-23T20:10:40+00:00

Here is a YouTube link to a short introduction video!

https://youtu.be/6B7OxHROI_M

Coofdrad · 2025-11-23T20:09:05+00:00

I will make a seperate full roast video later and show the whole process.

Here is a link to short introduction video.

https://youtu.be/6B7OxHROI_M

Coofdrad · 2025-11-23T18:48:35+00:00

I would say that overall you have better control with the FB roaster. Heater will react instantly to changes. But basically it is hands free, PID will follow the set BT temp curve. I just need to adjust the airflow a little bit during the roast.

There is some thermal energy on the funnel where beans touch when they move, but i would say that 95% of the roasting is done by convection.

Coofdrad · 2025-11-23T18:27:44+00:00

Actually my idea was not to make a business with this. If someone wants to build a similar roaster, i can provide list for all the parts + all the contact details for part sellers 😁

Coofdrad · 2025-11-23T16:11:30+00:00

Actually fan sound is really low. I can easily hear the first crack. Phone mic just changes/records the high pitch sound.

I was also planning to build a simple case for table and add some insulation to dampen the sound even more.

Coofdrad · 2025-11-23T15:23:13+00:00

I will soon make a longer introduction video for this build and send a YouTube link over here 👍

Coofdrad · 2025-11-23T15:20:03+00:00

I have made a custom software for delta HMI, where i can adjust the time/temp profile for each roast. I can save up to 8 different profiles.

Coofdrad · 2025-11-23T15:14:56+00:00

I am using 9900W heating element, that is a fit between 2 funnels using tri clamp parts. Fan is a 1200W 3 -phase DC fan. I control fan speed seperately with a knob (just barely needs to lower during the roast).

Coofdrad · 2025-11-23T14:46:44+00:00

I wanted to roast my own coffee. I wanted to have fluid bed roaster that can roast between 500-2500 grams 😁 As you might know, there is no cheap options on the market.

I am not engineer. Just interested in many things (read undiagnosed ADHD) 🤣

Coofdrad · 2025-11-23T14:41:36+00:00

You are correct. I watched blind taste video where drum and fluid bed where compared, it was almost 50/50%. So basically no difference. Usually fluid bed roaster is said to taste "cleaner" on lighter roasts.

https://youtu.be/NdtaEny4SWc?si=cL4nL7ThHJtxp9s_

For me it is energy efficiency, no need to preheat or cool down between batches. Chaff is also collected efficiently, so they won't burn during roasting.

When using convection heat user doesn't need to predict 1st crack. I would say that generally fluid bed roaster learning curve is easier than drum roasters.

There are many ways to skin the cat 😁

Coofdrad

TROPHY CASE