Last Updated: 27.03.2025
General Information
- Measurements: 380 x 465 x 515 mm (WxHxD)
- Power draw: 230V, 50Hz, 2050W
- Boiler capacity: 3.9L
- Weight: 35 kg
Volumetrics
Setting the volumetrics
- Press and hold the right most button (the one which doesn't picture a cup) until water stops flowing out of the group head, and it starts blinking to enter programming mode
- Put in your portafilter
- Press the button you want to program
- Press the rightmost button again to stop the flow and store the value
- Press the rightmost button again to exit programming mode
Standard Deviation
When using the volumetrics to pull a 18g in / 36g out shot of espresso, I observed a standard deviation of just 2.02g, which is pretty good.
Grounding of the Flowmeter
I ran into a small issue where the Flowmeter wouldn't report flow in an understandable and reproducible way.
This happened because some scaling had occurred on the flowmeter itself due to a brittle O-ring. Once I replaced it and sanded down the Flowmeter, so the grounding wire made contact to ground again, the flowmeter works flawlessly once more.
Hardware Exploration
Pinout of the Keypad
| Pin | Name | Comment |
|---|---|---|
| 1 | GND Continous LED | |
| 2 | GND Dose 4 LED | |
| 3 | GND Dose 3 LED | |
| 4 | GND Dose 2 LED | |
| 5 | GND Dose 1 LED | |
| 6 | Button Dose 3 1 | |
| 7 | Button Dose 3 2 | |
| 8 | Button Dose 2 | |
| 9 | Button Dose 1 | |
| 10 | Button Dose 4 | |
| 11 | Button Continuous | |
| 12 | Common Anode for the LEDs | +3.3V / +5V => Needs to be checked |
Doses are counted from the left of the keypad to the right