The Gray Code

• B C D

• 0 0 0 0

• 0 0 1 1

• 0 1 1 3

• 0 1 0 2

• 1 1 0 6

• 1 1 1 7

• 1 0 1 5

• 1 0 0 4

• 1 0 0 12

• 1 0 1 13

• 1 1 1 15

• 1 1 0 14

• 0 1 1 11

• 0 1 0 10

• 0 0 1 9

• 0 0 0 8

• Symmetric way of generating code where adjacent values differ in only one variable.

• Use the "mirror" approach to generate the Gray code.

• Unit-distance Gray code useful for error detection in a serial process

e.g. Water level indicator, wind direction indicator.

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