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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.
Can I suggest a https://github.com/cpq/bare-metal-programming-guide ? Spend a couple of hours, follow it, maybe that is the fundamental basics you're searching for?
My favorite resource for this is dwlech: https://github.com/dwelch67/raspberrypi
NOTE:
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Hence, a higher number means a more popular project.