Fermentation Monitor / Refraction Sensor
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Monitor the yeast activity in your fermentation project
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This Fermentation Monitor can measure the yeast activity by measuring the produced CO2 bubbles with a refraction sensor.
The bubbles are detected by a laser diode and a laser photo resistor. The bubbles refract the laser beam and interrupt the photo resistor signal.
I used an esp8266 with tasmota on it to count the interruptions and send that signal to my monitoring setup (https://gist.github.com/lhns/83ebf9d12aeddd07d24c029c83af36c9). Then I visualize the yeast activity in a Grafana Dashboard.
You can get these packs of laser sensors and photo resistors on amazon:
