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InfluxDB
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If you are looking for single switch PCBs with power and row/columns already soldered, there is the Sarcodina single switch PCBs repo with gerber files.
I modded the Kings to be more intuitive: put the Digital I/O in the center of a 5-pad cross and one has to solder the direction of the pin of the signal (up,down,left,right). The code is available here. A picture is available here.
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