English: This colored, animated gif image, shows clearly a 9 sensor single-track gray code. Each degree of rotation of the outer ring cause one and only one sensor to come into contact or to loose contact with an arc of the ring. The sensor subtly changes its color to indicate the change. Simultaneously, the corresponding, color-matched bit will change state in the binary code in the center of the image. Finally the label in the upper left of the image will display the total amount of rotation that the outer ring has traveled.
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