Debouncing rotary encoder

Jim, N5IB

ALPS, a maker of rotary encoders, recommends 10K pullup to Vcc, then 10K in series with 0.01 uF to ground.
The internal pullup in the ATMega is loosely specified - somewhere in the tens of K, max 50K

On our "RadI2Cino" we provided pads for the RC series pair to ground, but not for any additional external pullup.


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