RaspberryPID

Ever wanted to turn your coffee machine into a docker host?

This is a quick collection of docker containers i've put together to get a PID running on my Rancilio Silvia. It's currently able to control both steam and brew temperature. The wiring is pretty simple so i haven't drawn it up yet but the basic premise is:

Boiler --> Thermocouple --> Max31855K --via SPI0--> Pi Zero W 2--via GPIO 23/24--> 2 Relays (Switching where the existing thermostats were connected to the circuit.)

I managed to hide all of that in the front panel.

Current Features

• Brew temperature control
• Steam temperature control
• Configuration API
• Web Portal

Hardware

• Pi Zero 2 W
• MAX31855 Breakout
• Type K Thermocouple
• Relays

Future features

• Redis temperature history (Redis has a timeseries mode that would be good for this, not built for ARM so i'll have to build it myself)
• Auto sleep (incase i leave the coffee machine on too long again)
• Scheduler / Remote wakeup
• Timed shot control
• Built in drip tray scale (for measuring shot weight)
• Automatic weight based shot control
• Pressure sensor
• Pressure control
• Pressure profiling
• Pre-infusion