@hi_cial a grey code is an alternative to normal binary that ensures that only one bit ever changes at a time

0000
0001
0011
0010
0110
0111
0101
0100
1100
1101
1111
1110
1010
1011
1001
1000

-F/R

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@hi_cial it's used in cases where you want to avoid a glitch from two lines changing state at not *quite* the same time--by ensuring that, as long as you're always counting up or down by one at a time (like in a rotary encoder for instance), there are no cases where two lines would have to change at once
-F

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