There are lots of people who have "Arduinoed" their coffee machines, especially the Rancilio Silvia, which is an ugly-but-good-value machine, which can be PIDed

There are lots of people who have "Arduinoed" their coffee machines, especially the Rancilio Silvia, which is an ugly-but-good-value machine, which can be PIDed and hotwired. That's a good place to start.