espresso-mpc

A Raspberry Pi modification to the Rancilio Silvia Espresso Machine implementing model predictive temperature control. Longer description

Features:

• Brew and steam temperature control
• Web interface for displaying temperature and other statistics
• Programmable machine on/off timer and temperature set-point

Hardware

• Raspberry Pi zero W
  • £10 - https://thepihut.com/collections/raspberry-pi-zero/products/raspberry-pi-zero-w
• GPIO Headers
  • £1 - https://thepihut.com/products/40-pin-2x20-hat-dual-male-headers?variant=21454749700
• Power Adapter
  • £5 - https://thepihut.com/collections/raspberry-pi-power-supplies/products/eu-micro-usb-power-supply-for-the-raspberry-pi
• Micro SD Card
  • £6 - https://thepihut.com/collections/raspberry-pi-sd-cards-and-adapters/products/pimame-preinstalled-sd-card?variant=305692867
• Solid State Relay - For switching on and off the heating element
  • $10 - https://www.sparkfun.com/products/13015
• Thermocouple Amplifier - For interfacing between the Raspberry Pi and Thermocouple temperature probe
  • $15 - https://www.sparkfun.com/products/13266
• Type K Thermocouple - For accurate temperature measurement
  • $15 - http://www.auberins.com/index.php?main_page=product_info&cPath=20_3&products_id=307
• Jumper Cables - For connecting everything together
  • £5 - https://thepihut.com/products/adafruit-premium-female-female-jumper-wires-20-x-12-300mm?ref=isp_rel_prd&isp_ref_pos=3
• 14 gauge wire - For connecting the A/C side of the relay to the circuit
  • $5 - Hardware Store / Scrap

Software

• OS - Raspbian Jessie
  • Lite (no need for a GUI) - https://downloads.raspberrypi.org/raspbian_lite_latest

Install Raspbian and configure Wi-Fi and timezone.

Installation Instructions

Execute on the pi bash shell:

sudo apt-get -y update
sudo apt-get -y upgrade
sudo rpi-update
sudo bash -c 'echo "dtparam=spi=on" >> /boot/config.txt'
sudo reboot

After reboot

sudo git clone https://github.com/martinandreasson/espresso-mpc.git /root/espresso-mpc
sudo /root/espresso-mpc/setup.sh

This last step will download the necessariy python libraries and install the espresso-mpc software in /root/espresso-mpc

It also creates an entry in /etc/rc.local to start the software on every boot.