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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.
Well it's an open source project so all the information is available on the project's GitHub page. It should have everything including what micro controller it uses, what type of sensor it uses, and the code if you get stuck on something.
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.