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ReflowMaster
Reflow Master is an open source Toaster Oven reflow controller that includes both hardware and software.
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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.
Have a look at the ESP32 boards (Unexpected Maker has some real small ones) and the attachInterrupt command.
NOTE:
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Hence, a higher number means a more popular project.