Hi, Rebecca Minich here! I'm moonlighting as the CircuitPython wiz Scott Shawcroft today so I can share my Kombucha thermostat project. If you are a fan of sour, this fermented drink might be for you. Unfortunately, it comes with the health food price tag of $3/bottle. Brewing it is much cheaper and way more fun!
For a healthy culture and delicious tasting 'buch you'll need to maintain a pretty high temperature (~77F/25C) while brewing (5-7 days). Keeping the brew that warm is challenging in colder climates. With a little help from a terrarium heater and some electronics, I created a thermostat for brewing year round. Check it out below!
- Glass/Ceramic container: I highly recommend a container with a spigot.
- SCOBY and starter liquid: I bought my SCOBY from a local vendor but I've used this one too.
- Green or black tea
- Sugar: When first starting out it's best to use regular white cane sugar
- Terrarium heater: I have this one but any low output heater will do.
- PowerSwitch Tail 2
- Adafruit Feather: I used the Adalogger in case I decide to store temperature data.
- High Accuracy Temperature Sensor Breakout Board (MCP9808): AKA thermometer
- Micro USB to USB cord and AC wall adapter: An old phone/kindle charger works fine.
- Jumper Extension wires
- Wire Spool (optional): Depending on your Kombucha setup you may need extra long connectors. I used wire spool between my Feather and my PowerSwitch Tail.
- Misc: Small Phillips head screwdriver, electrical tape, infrared thermometer.