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cool switch
Digi-key part number CKN5029-ND, $10.38. This is a one-digit thumbwheel switch with BCD output. It has a small mechanical digit that increments/decrements by pressing one of two little buttons on it. The output is 4 bits representing 0-9, so you get 10 possible combinations. You can get 8 combinations (0-7) using only three of the outputs if you're tight on space.
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