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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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This project uses interrupts for the encoder. It uses the "Encoder" library mentioned in another comment.
https://www.pjrc.com/teensy/td_libs_Encoder.html
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DisKnobUI
Discontinued Experiment in using an old hard-disk as a rotary input device (with an Arduino and a Raspberry Pi).
I built one of those many years ago as well. :)
https://github.com/carlosefr/DisKnobUI
It thought about using that (the spindle motor from a hard-disk) for this project. The issue is that it's not very precise at very low speeds.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.