We’ve been rebuilding an Astoria two group espresso machine at the NYCR space and have finally made steam and espresso with it after a few weeks of cleaning. The pressure-stat triggered at 1.5 bar and the boiler held the pressure just fine. The pump produced precisely 9 bar. The hot water tap even looked sort of clean! Now that all functionality has been restored it is time to start on the computer control.
The controller will need:
- Six relays (two heater elements, two group heads solenoids, one fill valve and one pump motor)
- Three thermocouples (one per group head and one for the main boiler)
- Two pressure measurement (one main boiler up to 3 bar, one for the group heads up to 15 bar)
- At least two switches
- A multi-line LCD
- RFID reader
- An iPhone or Android app?