TODO

• Update requirements and install script
• Re-include web interface and make it a config whether or not to use it
• Make a F/C switch

silvia-pi

A Raspberry Pi modification to the Rancilio Silvia Espresso Machine implementing PID temperature control.

This is based on http://github.com/brycesub/silvia-pi and adapted to graph current and target temperatures on a PiTFT28 fitted above the steam valve.

UI

Target temp can be controlled via buttons. Bottom button dims the led backlight and turns off heating.

Hardware

• Raspberry Pi 2
  • $35 - http://www.amazon.com/Raspberry-Pi-Model-Project-Board/dp/B00T2U7R7I
  • $5 - Raspberry Pi Zero should work too
• PiTFT 2.8"
  • $45 Capacitive https://www.adafruit.com/product/2423
  • $35 Resistive https://www.adafruit.com/product/2298
• Power Adapter
  • Any Micro USB 5v / 2A supply will do, the longer the cable the better
  • $9 - http://www.amazon.com/CanaKit-Raspberry-Supply-Adapter-Charger/dp/B00GF9T3I0
• Micro SD Card
  • 4GB minimum, 8GB Class 10 recommended
  • $7 - http://www.amazon.com/Samsung-Class-Adapter-MB-MP16DA-AM/dp/B00IVPU7KE
• 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
• Ribbon Cable - For connecting everything together
  • $7 - http://www.amazon.com/Veewon-Flexible-Multicolored-Female-Breadboard/dp/B00N7XX4XM
    • Female to Female if using the Raspberry Pi 2
  • $5 - http://www.amazon.com/uxcell-Width-Colorful-Flexible-Ribbon/dp/B00BWFY6JI
    • Bare wire if using the Raspberry Pi Zero
• 14 gauge wire - For connecting the A/C side of the relay to the circuit
  • $5 - Hardware Store / Scrap
    • Don't skimp here. Remember this wire will be in close proximit to a ~240*F boiler

Hardware Installation

Installation Instructions / Pictures

Circuit Diagram

High-level circuit diagram:

Software

• OS - Raspbian Jessie
  • Full - https://downloads.raspberrypi.org/raspbian_latest
  • Lite (for smaller SD Cards) - https://downloads.raspberrypi.org/raspbian_lite_latest

Install Raspbian and configure Wi-Fi and timezone.

silvia-pi Software Installation Instructions

*** Outdated ***

Execute on the pi bash shell:

sudo apt-get -y update
sudo apt-get -y upgrade
sudo apt-get -y install rpi-update git build-essential python-dev python-smbus python-pip
sudo rpi-update
sudo bash -c 'echo "dtparam=spi=on" >> /boot/config.txt'
sudo reboot

After the reboot:

sudo git clone https://github.com/brycesub/silvia-pi.git /root/silvia-pi
sudo /root/silvia-pi/setup.sh

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

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