CoffeePi

CoffeePi - Automating portafilter machines

CoffeePi is an openly available project for customizing and automating portafilter machines. This project is deployed on a raspberry Pi 3 and a Astoria Argenta AEP. For connecting all sensors and actuators to the IoT-Device, a breakoutboard was develeoped.

Features of this project

The following features are currently implemented or in progress:

• Openhab interface
• SQLite Database backend
• 16x2 LC-Display and two buttons for user interaction
• Multithreaded and signal based Software architecture with very low CPU workload
• 3 5V/230V Relays controlling the main power, pump and the heating circuit
• 1-Wire Temperatur sensor (DS18B20)
• RGB LED Stripe with Controller
• Logging Framework with different verbosity levels
• Timer Framework
• Display Page Management corresponding to the machine state with delayed pages, prepages (page before the actual page corresponding to the current state) and postpages (similar to prepages)
• FSM controlling the and responding to the hardwarestate of the machine
• Event Manager with threads registering events and event subscriber

Software Features

• Auto-Brewing with predefinded Preinfusion (Amount-triggered) and predefinded Soak-Time. The brewing itself stops automatically after 30s or 65ml
• Cleaning Program
• Tracking of the number of brewed espressi and the comsumed energy (in kWh)
• Cleaning reminder after 35 cups or 90 days
• large user menu with information and settings (in progress)
• Reboot of the device and restart of the software available through the menu
• LCD Backlight turn off during idle

Deploy the project in your own coffeemachine:

All sensors(Buttons, LCD, Temperatur-Sensor, I2C-RGB-Stripe Controller) have to be available. The relays have to intercept the powercircuit, pump circuit and the heating circuit. All hardware access is either in a dedicated class (like 1-Wire) or in the hardware abstraction class (hal.h)