ESPressIoT

This project covers somewhat advances features for an espresso machine controller. The basic idea was to have reproducible "espresso results" due to temperature regulation and being able to fine-tune. Especialy small machines have a low heat capacity and quality suffers a lot from different heat-up-times and high hysteresis in standard temperature switches. This work is based on my previous work with with IoT, MQTT and my small controller cofcon. As always - take care, you are working with high voltages and you are switching loads up to a few Kilowatts. Please be sure yo know what you are doing, always disconnect and unplug you machine before installing electronics components, choose your components (cables, connectors, sensors, SSR etc.) wisely...

Dependencies

• Espresso Machine (Gaggic CC, Rancilio Silvia etc.)
• ESP8266 with Arduino for ESP8266
• ArduinoJSON v6
• Arduino-PID-Library v1
• ArduinoStreamUtils
• a suitable temperature sensor (e.g. TSIC 306 - library here)
• a SSR which is capable of switching your heater, has a low trigger threshold and does not draw too much current (otherwise you will toast your ESP8266)
• some electronics skills

Features

• very fast and accurate adaptive PID-Controller for the heater of your espresso machine (heat-up-time about 2 minutes, stability/RMS of ~0.15 °C)
• WWW-Interface for control, configuration and tuning
• Telnet-Server for PID status (analogous to serial terminal)
• MQTT-Interface (needs PubSub-Client)
• OTA-Flash enabled (over-the-air, flash firmware via upload in WWW-Interface)
• Serial Interface for testing, debugging
• JSON-Config in internal SPIFFS (uses ArduinoJSON)
• Re-Written auto-tuning-loop to optimize PID parameters
• integrated simulation to test features and functionality