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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.
If you don't want to implement the code for this yourself I wrote the TomServo Arduino Library that actually takes care of all of the details for you. You can install it from within the IDE using the library manager.
NOTE:
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Hence, a higher number means a more popular project.