An in depth look at Breville Bambino electronics...

I walkthrough the wiring and PCB schematic for a Breville Bambino. This might be a useful reference for anyone looking to repair/hack a Bambino or perhaps for people looking to DIY their own espresso machine (Gagguinio?).
Prior teardown video: • The Most Absurd Brevil...
Link to schematic, photos, and datasheets: github.com/techdregs/Breville...
=== Timestamps ===
00:00 Introduction
01:28 Hardware Wiring
08:28 Mains Voltage Switching
13:28 Low Voltage Power Supply
18:34 Microcontroller and Controls
29:20 Summary and Conclusion

[@user-hw1do7sw9y]

Excellent video. Thank you very much for sharing.

[@joelbetancourt8359]

WOW, thank you so much for this video.Pure Gold. Excellent guide and detailed information. I accidentally plug the espresso machine to 220v outlet and this info may come handy. I have my finger crossed and maybe I just have to replace the fuse and the varistor. Mine is the Bambino Plus I hope it has very similar electronics at least the area that blew up. Thank you and keep the good work.

[@TechDregs]

Hope it's an easy fix!

[@ameliabuns4058]

Did you open it? was the PCB very different?

[@ovi_4]

It would be a fantastic addition if one could decipher the programming code and figure out a simple mod to add a 7-segment led display or a small 32x64 OLED and 2 push buttons to allow you to constantly monitor the current temp at the group head and make negative or positive micro-adjustments to it. My dream comes true....

[@arcmchair_roboticist]

The presence of the eeprom is fascinating.
The stm32 itself has 128k of program storage and the eeprom has just 64, so I wonder what it's even there for. The only thing I can think of is that when you switch on the machine for the first time it refuses to make coffee and requires that you purge 500ml of water through it first.
Maybe the eeprom is just there so that it can switch between those modes? That seems like kind of a crazy reason to add a whole additional component, and I'm not even sure if that's how things work, I'm not an electrical engineer or anything. This aligns with pin 7 on the eeprom being left floating though which would make it writable. This might be by far the easiest PID mod if we just have to reprogram that stm32.

[@TechDregs]

Yeah, I figured it was for user defined settings maybe? Like, when you program your own shot volumes perhaps? Definitely odd, given the chip capabilities.

[@arcmchair_roboticist]

@@TechDregs Oh duh, that is a way more important reason. I wonder why they couldn't just store that in the stm32, maybe they thought the flash on the controller would be less reliable for some reason? I wonder if I can find any connectors to put into T_CON since those pins have usart and that would open the door to either just connecting to a display, or even better connecting to a raspberry pi or something mounted on top of the machine.

[@TechDregs]

IIRC, they were 1mm pitch. I looked around a bit, and never did ID what connector they are using. Kind of looks like a Molex Pico Lock, but they aren't quite the same.

[@islou]

Fantastic work! Would you be willing to commit the KiCad schematic files you drew up to the Github repo ?
It inspired me to go down the route of a custom firmware / PCB replacement for the Bambino Plus. I've just ordered a slightly broken Bambino Plus (to avoid sacrificing the daily driver) and wonder if the unpopulated parts of the board are for the plus model 🤔

[@ameliabuns4058]

damn this looks so freaking easy to mod, surprised nobody else has, if I add temp ccontrol and remove the cleaning faetures I genuinely think this would be as good as a super expensive machine for me :| tempting but I need my machine and don't want to buy a second.
also with an stm32f070 i can just... reprogram it instead of making my own PCB!
somethings are confusing tho, why the seperate eeprom chip...