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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.
Cheapest way would be ordering all electronics from aliexpress, and PCBs from jlcpcb. It's definitely not the easiest nor fastest way though. If you'd go with ordering yourself then I highly recommend this wiki https://github.com/joric/jorne/wiki
NOTE:
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Hence, a higher number means a more popular project.