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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I linked to this article exactly for the same reason! Interesting use for the PIO even if in this case, the hype fell a bit short of expectations. There's also some code available for more "traditional" MCUs, maybe this will work better on a black pill (STM32F411): https://github.com/Xerxes3rd/libmaple
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.