AI & Technology
Smart Sensors for Fermentation Monitoring
Cheap sensors, good apps, and what data is actually worth tracking — and what's just expensive overkill.
Sensors and connected devices have made it possible to track fermentation with scientific precision. Most of it is useful. Some of it is overkill.
What's worth tracking
Ambient temperature — the single most useful data point. A $20 wifi temperature sensor pays for itself in better timing.
Dough temperature — different from ambient, especially during active fermentation. A probe thermometer with a remote display works.
Starter activity — when does it peak? A simple jar with a rubber band tells you, but a proofing dish on a tared scale gives you a curve.
Humidity — relevant for crust and surface drying, less so for fermentation timing.
Useful tools
TP-Link Kasa or Govee sensors — $15–25 wifi temperature/humidity sensors. App alerts when temperature drifts.
ThermoWorks Smoke or RTD probe — for dough or banneton interior temperature monitoring.
Sourdough Companion app — logs feedings and bakes; calculates optimal timing.
A simple kitchen timer with intervals — sometimes the best tool is the simplest one.
What's not worth tracking
pH meters under $50 — too inaccurate to be useful. Pro pH meters are $200+; not necessary for home baking.
CO₂ sensors — fascinating, expensive, marginal benefit.
Computer vision dough analysis — interesting research, not yet practical.
Fermentation jar IoT — overkill. A rubber band on a clear jar gives you the same data.
Building a setup
Minimum useful tracking:
- Wifi temperature sensor near your dough
- Notebook or app for feedings and bake notes
- Probe thermometer for water and final bread temperatures
Cost: $40 total. Worth it.
What the data tells you
Two weeks of temperature data reveals patterns you'd never notice otherwise:
- Your kitchen is 4°F warmer in the afternoon than the morning
- Your starter peaks 2 hours faster on warm days
- Your bulk ferments faster near the stove than across the room
- Winter requires 30% longer fermentation than summer
This data lets you predict times instead of guessing them.
The aliquot method (analog version)
Take a 50g sample from your bulk dough; put it in a tall, narrow clear container; mark the starting level. Watch its rise alongside your main dough. When it's risen 50–70%, your bulk is done.
This gives you the most useful information of any "sensor" — and costs nothing.
Limits of automation
Bread is not a fully automatable craft. The best technology helps you observe better — not replace observation. Spend most of your attention on the dough, not the data.
Recommended starter setup
- $20 wifi temperature sensor (Govee H5179 or similar)
- $20 instant-read probe thermometer
- A notes app on your phone
- A clear jar for the aliquot method
Total: under $50. Reduces guesswork to almost zero.