Reads the digital value one the defined port. These are exposed as TinkerKit connectors on the robot. See the diagrams below for pin locations
port: Valid names are TK0 to TK7 (found on the Control board), TKD0 to TKD5 (on the Control board), and B_TK1 to B_TK4 (on the Motor Board).
Corrections, suggestions, and new documentation should be posted to the Forum.
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