Which espresso machine to mod? look for those that has big empty space inside, eg Gaggia classic, or Rancilio Silvia, or Brasilia Lady.
Typically these machines have existed for more than 30 years, and do not have any electronics inside. They use a single brass or aluminum boiler, controlling on/off by thermostats.
The pump is typically a vibration pump
steam generation by another thermostat
provides the principles, code, schematic, builds, instructables. ( but not very active)
hacking a Brasilia from Rhys Goodwin
iSPRESSO and instructable
Es(pi)presso and on home automations
arduino-PID-controller-for-espresso by Ross Satchell and published on hackster
Espressuino based on arduino
pressure control in gemilai crm3605 by pierreye
gravimetric mod on home-barista
auto flow profiling using raspberry pi
saeco intelia mod
Commercial:
Homebarista UK for gaggia
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