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Smart espresso machine using a Raspberry Pi 4 and a few sensors.

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Smart Espresso

WORK IN PROGRESS

This project is a work in progress. The goal is to create a smart espresso machine using a Raspberry Pi 4 and few sensors to monitor the pressure of the water in the boiler and in the head of the machine. The pressure sensors are connected to a MCP3008 ADC and the Raspberry Pi is connected to a Home Assistant instance to monitor the pressure.

Prerequisite

Hardware

Items Description Link Notes
1 Raspberry Pi 4 Model B 2GB RAM
1 MCP3008-I/P MCP3008 DIP-16 https://a.aliexpress.com/_olcJc4g
2 Pneumatic Plumbing Brass Pipe Fitting Male/Female Thread 1/8" 1/4" 3/8" 1/2" BSP Tee Type Copper Fittings Water Oil Gas Adapter https://a.aliexpress.com/_okOIGjW Choose the F-F-M 1/8"
1 Water Oil Fuel Gas Air Pressure Sensor Transducer (PT1/4 G1/2 G1/8) 5-12V 0.5-4.5V 0-300Bar Gauge Optional Consumer Electronics https://a.aliexpress.com/_omToNFi Choose the 0-0.5Mpa G1-8 and write to the seller that you need the 3.3v version
1 Water Oil Fuel Gas Air Pressure Sensor Transducer (PT1/4 G1/2 G1/8) 5-12V 0.5-4.5V 0-300Bar Gauge Optional Consumer Electronics https://a.aliexpress.com/_omToNFi Choose the 0-2Mpa G1-8 and write to the seller that you need the 3.3v version
1 60 Values 1/4W 1% Metal Film Resistors Kit 300Pcs 1 ohm - 4.7M ohm 1/4 Watt W High Precision MF Resistance Set Assortment https://a.aliexpress.com/_oBZ1yNa
1 530pcs/Set Polyolefin Shrinking Assorted Heat Shrink Tube Wire Cable Insulated Sleeving Tubing Set 2:1 Waterproof Pipe Sleeve https://a.aliexpress.com/_okRXZ5m
1 DIY Prototype Raspberry Pi Expansion Board PCB Shield Compatible for Raspberry Pi 4B/3B/3B Board For DIY Starter Projects https://a.aliexpress.com/_opgseK8
1 1.3" OLED Display Module White/Blue Color Drive Chip SH1106 128X64 1.3 inch OLED LCD LED IIC I2C Communicate For ArduinoProjects https://a.aliexpress.com/_oEzEfpA Nice but too small

Tools

  • Soldering iron
  • Soldering wire
  • Multimeter
  • Ratchet wrench
  • Screwdriver
  • Teflon tape

Wiring diagram

How to wire the display to the Raspberry Pi

display

RaspberryPi SH1106
Pin 6 (GND) Pin 1 (GND)
Pin 1 (3.3V) Pin 2 (VCC)
Pin 5 (SCL1) Pin 3 (SCL)
Pin 3 (SDA1) Pin 4 (SDA)

https://pinout.xyz/pinout/i2c

How to wire the pressure sensor to the MCP3008 and the MCP3008 to the Raspberry Pi

analog

RaspberryPi MCP3008
Pin 1 (3.3V) Pin 16 (VDD)
Pin 1 (3.3V) Pin 15 (VREF)
Pin 6 (GND) Pin 14 (AGND)
Pin 23 (SCLK) Pin 13 (CLK)
Pin 21 (MISO) Pin 12 (DOUT)
Pin 19 (MOSI) Pin 11 (DIN)
Pin 24 (CE0) Pin 10 (CS/SHDN)
Pin 6 (GND) Pin 9 (DGND)

https://pinout.xyz/pinout/spi

Raspberry Pi configuration

Enable SPI

sudo raspi-config

Select "Interfacing Options" and then "SPI" and enable it.

Install the required packages

sudo apt-get install python3-dev python3-pip
pip3 install smart-esppresso

Usage

Params

Key Description
analog_devices List of analog devices (PressureAnalogSensor)
client_ha Home Assistant Client
display luma oled device

Example

This example is a simple script that reads the pressure from 2 pressure sensors, displays it on the OLED display and sync data with Home-assistant.

References / credits / inspiration

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