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@grishka @gilesgoat @tubetime If it's slow enough you can use the earth ground for that. See https://en.wikipedia.org/wiki/Earth-return_telegraph (I'm not suggesting this as a recommended solution, but as an interesting tidbit!) |
Giles, actually I don't think 1-pin connectors are a thing at all. You need at least 2 pins to do something useful because there has to be a ground connection.