I purchased a new Gaggia Classic Pro (Cherry Red) coffee machine the other day with the intention of converting it into a Gaggiuino.
I have been hunting for a used Classic on Facebook marketplace for ages, and almost bought one, but the deal didn't happen. So in frustration, I decided to buy a new one.
Hopefully, the extra dollars I spend on a new machine will be offset as there should be no mechanical defects. It's probably a good idea to use the new machine for a few months to make sure everything is OK. It's got a 12 month warranty.
In this time, I can order parts, do some research, etc, etc
The model I bought is a 2024 Gaggia Classic Evo Pro.
Model number: (SIN035UR) RI9481/12.
https://gaggiuino.github.io/#/?id=home
This should be a fun project.
I can either do what's called a Lego build, or buy a pre built PCB.
The developer, Zer0-bit is doing all this work for free.
I think its so cool.
It's a community based (not for profit) model with I think lots of people giving their time and effort for free in the pursuit of that prefect glass of black gold.
The community uses discord:
The main additions that are added to the Gaggia are a MAX6675 thermocouple module paired with a K-Type thermocouple sensor for closed loop control over the temperature. Options for adding an AC dimmer module that attaches to the pump motor and a 0 Mpa to 1.2 Mpa ranged XDB401 pressure sensor, installed in line between the pump and the boiler, provide further closed loop control over the pressure and flow profiling.
I recommend you buy from one of the official suppliers.
I ordered a Peak Coffee Kit.
They are based in Hong Kong.
This uses a prebuilt PCB with all the parts installed.
I think this is the easiest way to go. (for the record, the parts are below).
I understand that you need to be patient with the orders... could take a few months to arrive.
My machine uses a Gaggiuino PCB v3.1:
BOM - Parts needed for
(STM32 Blackpill and gaggia classic pro):
+ PCBv3.1
+ STM32 blackpill (included on the Pcb)
+ ST-Link-STM32.... allows you to flash the board.
+ MAX6675 Thermocouple Module
... it reads the temperature from the boiler.
Controls when to turn on/off the boiler so
the temp remains constant
+ Ungrounded Thermocouple Sensor | K-type, M4, 0.5 m long
Sensor Finglai ? M4 thread - screws into the boiler
+ Dimmer switch (used in light switches) .
Controls the cycles/sec of the vibratory pump. (changes the pressure of the water delivered from the pump to the boiler?).
+ Pressure transducer (pressure sensor - 0-1.2Mpa ) .... measures the pressure
+ ADS 1115 Module ADC with ProGain Microcontroller 16 Bit Amplifier Board.
This amplifies the signal from the Pressure transducer.
+ 40DA SSR Relay
5V Low-level trigger 1 channel relay module..... opens & closes the solenoid to control waterflow
into the portafilter.
+ Power supply boards ...x 2
12V/1A PSU .... takes AC & turns it into 12VDC... connected into the wall Power Supply
12V to 5V stepdown
+ RC Surge Absorption/ Snubber circuit Protection Module.
Its connected in parallel into the relay to prevent voltage spikes turning on & off the solenoid.
+ Display - 2.4" Nextion LCD + MicroSD card (Class10 HC 8GB to 32GB)
+ Flat gasket/o-ring | 1|4 inch pipe (11 x 6 mm), 3 mm thick
Links
+ Hackaday
+ Nomans Substack - building a c0ffee machine from scratch
OPV - over pressure valve
3 way solenoid valve - allows water to run from the boiler to the brewhead
or back from the brewhead when there is excess pressure & water... this removes a soggy coffee biscuit...... discharges the pressure into the drip tray.
----------------
3PLN
3 3-Way Valve 3-Way Solenoid Valve that controls flow between the group head, boiler,
and vent tube
P Pump Vibratory pump that pumps the water
L Line AC Line voltage
N Neutral AC Neutral voltage
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Aluminium boiler
Don't buy the 2015 version
Things to buy:
Buy a blind filter to back flush the machine.
springs - 9Bar, 6.5Bar, 5Bar
for Gaggiuino the OPV should be 10-12 bar?
My 2024 Evo model doesn't appear to need the OPV mod ... it already has an appropriate pressure?
The standard basket will fit 20g coffee fairly well.
Swap the two hole steam tip with a one hole tip.
Load cells can be attached to the drip tray to allow for feedback about the pour weight
---------------
To print:
1. component housing
or
2. Touchscreen Housing and Funnel Plate Mount
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Part 2 Gaggiuino V3 - Build Log Notes - switches, PCB
This build log is a bit confusing on parts. The dimmer, the amplifier board, the stepdown converters, the relay and the snubber are all part of the PCB build... They are needed for the lego build only.
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