Instead of messing with the wiring, [Marco] took the non-invasive approach and is using a DIY coil to detect the magnetic field of the espresso machine’s pump and start a shot timer. An LM358 ...
A common hacker upgrade to an espresso machine is to improve stability and ... We’ve seen [Schematix]’s work before with a DIY induction heater which showed off thoughtful design, and it ...