An Open Source Tempeh Fermenter
Produce protein-rich tempeh in this Raspberry Pi Pico-controlled fermenter.
Tempeh, as described by Maud Bausier, “is a natural source of plant protein obtained by fermenting legumes with mushrooms, discovered in Indonesia several hundred years ago.” Indonesia’s climate is ideal for producing this type of food. To enable its growth and consumption in other areas, the Domingo Club has built an open source fermenter that replicates its native environment heat-wise.
The fermenter electronics are fairly simple, consisting of a small fan, heating pad, and temperature sensor, along with a Raspberry Pi Pico for overall control. A 1.3" OLED display and button are implemented as a user interface.
The device is designed to be sufficient to reproduce the environment required for mycelium growth, but simple enough to understand, improve and repair if needed. Refreshingly, it doesn’t connect to the Internet for interface and tracking, which would waste power and make it more complicated. On the other hand, one could probably add this functionality if so desired.
The build's structure is produced using digital fabrication techniques: CNC milling, laser cutting, and 3D printing. The outer enclosure is made of dyed natural wood fiber, which reportedly produces an excellent finish and texture. Wood sections slot together without the use of fasteners for an elegant design. Technical panels and shelves are crafted out laser cut stainless steel, and a variety of supporting components are printed out of PLA.
It’s an interesting design, and something that could provide an introduction to a type of food that you may not have tried before. As seen in the images below, it looks quite appetizing!