Mazzer "Bilancia" Mod - Always exact grams and no timer anymore!

#1: Post by **Tobias007** » May 31st, 2020, 10:14 am

Hi all,

after modding several coffee machines over the last years - I thought about modding and improving the grinder as well.

Outcome is the Mazzer "Bilancia" mod

I wondered since years, why is in grinders no built in scale available. So I started to built my own one.

At the moment the following functions are supported:

- Setup coffee powder weight for 1 Cup/2 Cups
- Scale with accuracy of 0.1g
- Grind exactly to the defined gram value and stop motor instantly when target is reached
- Automatic tare and calibration function
- Manual tare function
- Messure of grinding time in 0.1sec steps
- Possibility to enter a correction factor in 0.1g to hit exactly the desired gram amount
- Wifi enabled version (to track and log grind results)

I first built it for the Mazzer Mini Electronic B. After several months of use I decided to mod my Super Jolly as well.

Here some impressions:

Cheers, Tobias

#2: Post by **TomC** » May 31st, 2020, 12:09 pm

Good stuff Tobias!

So you don't have to have the motor slow down toward the end of the dose?

#3: Post by **platinumlotus** » May 31st, 2020, 1:03 pm

Wow. Would love to hear the grinder in operation and how did you mod it.

June 1st, 2020, 6:55 am

TomC wrote:Good stuff Tobias!

So you don't have to have the motor slow down toward the end of the dose?

No, this is not necessary (would be also complicated to drive the 220V AC motor with different speeds).

It is pretty reliable to measure every 0.1s the achieved grams during grinding and then stop at the target value. As usually there is still a little bit coffee in the funnel which falls down after reaching the desired target, I've build the correction factor. Means if target is set to 15g .. it stops the motor already at 14.3g (-0.7 correction factor). The remaining 0.7g fall down from the funnel - and you reach exactly 15g (ok: to be fair, sometimes it is 15.1g or 14.9g - so max deviation is 0.1-0.2g.)

#5: Post by **stoned_survival** » July 14th, 2020, 1:30 pm

Would love to hear more about how you did it !! Looks amazing!

#6: Post by **DamianWarS** » July 15th, 2020, 2:32 am

Tobias007 wrote:Hi all,

after modding several coffee machines over the last years - I thought about modding and improving the grinder as well.

Outcome is the Mazzer "Bilancia" mod

I wondered since years, why is in grinders no built in scale available. So I started to built my own one.

At the moment the following functions are supported:

- Setup coffee powder weight for 1 Cup/2 Cups
- Scale with accuracy of 0.1g
- Grind exactly to the defined gram value and stop motor instantly when target is reached
- Automatic tare and calibration function
- Manual tare function
- Messure of grinding time in 0.1sec steps
- Possibility to enter a correction factor in 0.1g to hit exactly the desired gram amount
- Wifi enabled version (to track and log grind results)

I first built it for the Mazzer Mini Electronic B. After several months of use I decided to mod my Super Jolly as well.

Here some impressions:

image
image
image

Cheers, Tobias

Very cool, I have a Baratza Vario-W which doses by weight. Sometimes it's. ±0.1 grams off or you just want a little more. Does this set up allow to pulse the grind so you can "top it up"?

July 16th, 2020, 4:02 pm

Yes, pulse grind is possible. I've used the manual button for this.

#8: Post by **platinumlotus** » July 18th, 2020, 11:57 am

I wonder why this thread received so few attention. Tobias, could you share how did you do this, and is this possible as a DIY project?

#9: Post by **XS750AU** » July 20th, 2020, 5:09 am

Hi Tobius
Great work, a very neat integration.
Curious as to how you interfaced the load cell into the grinder motor control?
Did you use an arduino module?
Thanks
Tim

#10: Post by **AboHadi** » July 25th, 2020, 7:02 am

That looks amazing Tobius
I'm also curious to read more about the process !