Purchased a Gaggia New Classic Pro Cherry Red Coffee Machine
https://gaggiuino.github.io/#/?id=home
This should be a fun project.
The main additions 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 ordered a Peak Coffee Kit but for the record, the parts are below.
BOM - Parts needed for
(STM32 Blackpill and gaggia classic pro):
+ PCBv3
+ 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.
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?
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
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