use Mix.Config log_level = System.get_env("LOG_LEVEL") config :logger, level: String.to_atom(log_level || "debug") config :blinkchain, canvas: {8, 4} config :blinkchain, :channel0, pin: 18, arrangement: [ %{ type: :matrix, origin: {0, 0}, count: {8, 4}, direction: {:right, :down}, progressive: true } ]