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Dan
@MarioRuiz I think this might be a duplicate of #22 Before getting into that thread though, check that your user is a member of the gpio group.
Same issue on a Pi 3B, with Ruby 3.0.0 and 2.5.1. Before finding this thread I'd tried rbenv, RVM and a clean install of Raspbian.
> @mbegley "I haven't been able to get get the first mapping working yet, because I don't have permission as a user to read from this device. I think I...