COM-GND Espresso is an open-source hardware and firmware project aiming to develop a standard set of sensing and control modules for Espresso machines.
With the growing accessibility of advanced microcontrollers and sensors, it has become significantly easier to develop automated control systems. COM-GND Espresso intends to establish a common set of low-cost, plug-and-play electronic components so that attention can be focused on experimentation through software control.
This hardware project is under active development in conjunction with the GND-CTRL software interface.
This project works with 110V AC Current. Use at your own risk.
This project is unstable and undergoing active development.
- Pressure Sensor for pressure profile feedback
- Variable pump power modulator for pressure profile control
- Pressure knob rotary encoder for manual pump control
- BLE (Bluetooth) interface for App control
- Boiler temperature sensor / PID control
- Bluetooth shot scale integration
- Water-tank scale for flow profiling
- Esp32 DevkitC: Microcontroller with onboard BLE
- Robotdyn AC Modulator: Pump power modulation
- TE Analog Pressure Transducer: 10 Bar boiler pressure sensor
- Note: For new projects, the Digital I2C version is recomended for easier interfacing with the ESP32
- Note: adding a pressure sensor requires altering the machine's internal plumbing.
- Vishay Temperature Sensor
This is a Platform.io based project using the Arduino framework.