Thanks to jaromir-sukuba, and racerxdl for working on firmware to implement C2 protocol via arduino GPIO. This work largely pulls from them, as well as connorpp. C2 is a 2-pin protocol. Any arduino ...
Hardware inputs were also provided to allow a manual key and a Morse Paddle to be connected, but they were added as secondary option to using the keyboard. While the keyboard option work quite well, ...
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