The sourdough craze at the beginning of the pandemic blockade resulted in many delicious crusty breads, as well as this ingenious device: Peanut Butter Jar Equipped with a raspberry pie And an electronic ink screen, it can measure the carbon dioxide level of your yeast starter-or actually anything fermented in a jar-to let you know when it’s suitable for baking.
The brainchild of artists and manufacturers Noah Feihan, Who is blogging Hi hi hi net, E-Ink Starter Monitor shows the CO2 output of the last three hours and how much sourdough has risen during the same time period. This is the result of two years of bubble dough observation and experimentation.
The component is completely built into the lid of the fermentation tank, using a fan to suck a constant flow of air from the tank through its CO2 sensor-Adafruit SCD-30-and the height of the sourdough in the tank is using the Adafruit VL6180X time-of-flight distance sensor, both Connect to a custom PCB (sadly a surfboard rather than a more suitable breadboard). The CO2 sensor also measures the temperature, and Feehan uses it to determine whether the jar has been placed in the refrigerator-if you must save battery power, turn off Wi-Fi. The LilyGo electronic ink screen displays the carbon dioxide level and the height of the starter in the past three hours, and its built-in ESP32 Wi-Fi and Bluetooth module is responsible for wireless communication.
For more fine-grained statistical data, jar can pass its data to Raspberry Pi Zero W through the MQTT (Message Queuing Telemetry Transmission) protocol, which can also record more than three hours of data to obtain long-term trends.
Feehan hinted in his post that he is working with the Massachusetts Institute of Technology on zero-gravity fermentation, so this may be just the first step towards producing delicious, rich sourdough in space.
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