This method reads the digital value in a specified port.
These are exposed as TinkerKit connectors on the robot.
The parameter port must be a valid name. Here's a list
*TK0 to TK7 (found on the Control board)
*TKD0 to TKD5 (on the Control board)
*B_TK1 to B_TK4 (on the Motor Board)
HIGH or LOW
Serial.println(Robot.digitalRead(TK0)); //Print the value read on port TK0