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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.
I/O bound tasks sit well on ESP style boards (the D1-Mini boards go for under £6 in the U.K. on eBay - better boards are available) and I'm getting interested in low power boards - MakerMeik on YouTube has some great designs but my surface mount skills are zero. I need to play with the bigger ESP boards (Unexpected Maker has some great stuff) and their own network so I can get some info from the garage without extending the WiFi. BLE on the Pi boards has been fine (easier to use than the Apple OS random Mac addresses) but one update messed this up for a week or so (and I needed the update for another bug).