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Marlin
Marlin is an optimized firmware for RepRap 3D printers based on the Arduino platform. | Many commercial 3D printers come with Marlin installed. Check with your vendor if you need source code for your specific machine. (by Jyers)
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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 glued 2 5p DuPont connectors back to back and put a red wire for vcc, a black wire for ground, a yellow wire for tx, and a green wire for rx (the colors are irrelevant, just for making sure the correct pins are connected to the pi) according to this schem: https://github.com/Jyers/Marlin/discussions/814
NOTE:
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