Story
See https://selectiveappeal.org/posts/dough133/
Dough133 is an intelligent heated enclosure for fermenting and proofing sourdough. It uses a small Coleman cooler as the container for the dough, a PTC heater, a simple temperature/humidity sensor in the cooler to monitor conditions, and my own microcontroller board mounted on the outside of the cooler for control.
It consists of these basic elements:
- Enclosure: An insulated space for the dough,
- Heater: Heats the air in the enclosure,
- Temperature/humidity sensor: Allows the controller to react to the conditions inside the enclosure,
- User interface: Used for enabling and disabling temperature control, setting the goal temperature, and monitoring the device,
- Microprocessor board: Implements the user interface and controls the conditions in the enclosure,
- Power supply: Powers the heater, sensors, and microprocessor board,
- Safety system: Ensures that problems with the overall system will not lead to overheating.
The C++ firmware, KiCAD design for the PCBA, and OpenSCAD sources for all 3D-printed components are available with the MIT license at GitHub Dough133.
A full writeup and details of the hardware design are disussed at SelectiveAppeal.
