Read the position of the Y-axis of the joystick. When the joystick is in the center, it returns zero. Positive values indicate the joystick has moved up and negative values when moved down.
int : 0 when the joystick is in the middle of the y-axis; 1 to 512 when the joystick is moved up; -1 to -512 when the joystick is moved down.
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