Hi Darrel,

Yes it is that switch. The idea was to have pull-ups off, use portb.4 as the supply, b3, & b5 as the encoder inputs, with the 100k weak pull-down resistors, and sw1 as the input when I push on the encoder shaft. I can't see why this does not work with the pull ups off.

Oh well, back to the drawing board. Thanks.

Bob.