Temperature control for a coffee machine

The old Coffee machines from VBM are beautiful and makes amazing coffee. Unfortunately, the electronics and control are outdated. For challenging myself and learning new stuff, I decide to update the electronics.

Using microcontroller for precise temperature control on a 30 years old Domobar Inox with useless feature like Wi-Fi, a webpage in the local network for monitoring and controlling

Hardware

1. Esp32
2. Measuring Amplifier MAX 31865
3. PT100
4. Solid-State-Relay
5. OLED Display SSD1306
   • actual value
   • target value
   • process variable
   • water level

6. Modified VDO fuel tank sensor for water level

Added Features

1. PID proportional–integral–derivative controller for temperature control
2. PT100 Sensor
3. Water level
4. Asynchronous web interface
5. Visualized water level in CSS picture, blue rectangle represents water level
6. Using both core of the ESP32. One for temperature/controlling, one for the webpage

6.Slider for target temperature

7.Chart for temperature

8.Time over NTP

9.Wake-up timer

Shout-out to https://randomnerdtutorials.com/, https://www.youtube.com/c/AndreasSpiess, https://lenadesign.org/2020/04/27/css-coffee-express-animation/ and the amazing open source community for sharing their stuff and knowledge!! Thanks Timm for the cinematic picture!