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Thanks for the info. I am pretty certain the Gagguino is a superior setup out the box with a lot of the guesswork taken out of a custom implementation esp. with the hardware scales etc as you say. I think it's about what you want out of it isn't it. I want to hone my understanding of PID and how temp and pressure are related etc so I am thinking of going the fully custom route with a Pi.
Invent
@Sainsburys_Ed @Light_EDDed - My Gaggiuino thoughts after living with it for 6 months
TL;DR = zero regrets, a fun project that makes great coffee. I use very little of the profile functionality as I'm focusing on grind and puck consistency first.
Main build = straightforward (I was starting with a recommended machine version), the wiring can be a bit complex but take your time and triple check. Just remember, you will be playing with mains supply so don't get lazy.
Hardware scales = This was the game changer for me, originally I didn't bother but now I couldn't do without it, just press brew and walk away. Definitely more difficult given the fiddly soldering, aligning magnets and the annoying process to calibrate (flashing back and forth between brew and scales calibration builds).
I've a Gen 2 build (smaller screen) and I'm not planning to upgrade as I like the aesthetic with the smaller screen.
@Invent - Yeah, it's a shame to have gone closed source but I understand his viewpoint about focusing on on a quality product for specific hardware and avoiding the variant chaos on Discord. Have you considered implementing something yourself? I suppose a headless PID without any profiling complexity would effectively be the same as those PID boxes, but where's the fun in that ;) Other option could be to do both, there's a spare thermocouple point on the boiler and wouldn't be hard to fit another t-junction and pressure sensor