I just wanted to share a preview of a open source mod I’ve been working on. My design goals were:
- 0.05g accuracy
- Single-shot self-learning algorithm (no need for tuning, even after changing beans or grind settings)
- Professional appearance
- User-friendly operation
- No permanent modifications to the grinder
Costs are roughly about 40-50 eur.
I’ve iterated on this design, testing various control algorithms and different hardware (ADC converters, load cells, boards, etc.). I’m very happy with the current result. It consistently grinds on target, and if – on the rare occasion – the last pulse triggers an avalanche of grinds and causes an overshoot, at least you’ll know. 🙂
The endgoal is to share the design as an open source project.
by Jaappppppp
28 Comments
Wonderful!
Wow thats pretty awesome!
Pretty cool if you already had a specialita and wanted to have the GBW like the libra.
Tres bien!
I love you man – if that works let me get you a coffee
Which eureka grinders will be compatible with? Would a Silenzio work?
I’m in, do you have a GitHub? I have this same grinder and have done a single dose modification which I’ll happily remove.
Great Job!
How easy/difficult is the mod? This is brilliant!
https://preview.redd.it/kjn73gf09ynf1.png?width=2622&format=png&auto=webp&s=cdc76a233e32740dbbbf668a7ff689c160bd032e
Something fun to share, as a side mission to tune the algorithm i needed good data logging as well, so we have a very elaborte dashboard to view our grinding statistics lol.
Thanks man you’re a genius
Highly interested in this as I have two specialitas. No 3D printer or soldering skills though
Great work! Have done a similar mod myself, using an external display however. How have you been able to use the original touch display?
Oh my god!!!
What a beast!!! That’s insane!!! My Specialità is dying to try that out!!! Hahaha
There is already an openGBW on github, and I finished it about a week ago.
It works great.
Instead of doing little spurts like yours does, this one tries to calculate the amount that will come out after stopping.
It usually hits within 0.1g, when switching beans the worst I saw was 0.3 out.
Uses an ESP32, a load cell, screen, rotary encoder and some 3D prints.
I had to modify the code a little to make it work, but know that it does work I’l never go back to single dosing.
Here’s the link:
https://github.com/jb-xyz/openGBW
On a side note, how does the specialita compares to the encore ESP Pro?
Just… making sure… you all know they make a “gbw specialita” already called Libra, right?
I now have a new need.
Seems like something a lot of people would pay $10-50 for.
Good thing I have a Mignon Zero (plain old delightfully dumb On/Off toggle switch) or I’d be tempted.
Nicely done!
That’s so fucking boss
Could you make this without the Specialita’s screen? Maybe using an android app for the interface. Asking for a crono owner 😀
Can I get this for my Libra? That updated display would be a nice touch.
Bruh I just sold my specialita
Cool! I’m interested to try it out, if you’re open to share it. I am a dev and electronics fan so if you have a repo that’d be great 😇
So many particulates flying around. Do you even spritz your beans?
What? this isn’t r/espressocirclejerk ? My bad.
Awesome