Re: Continuous rotary switch

garethrichardadams@xxxxxxxxxxx wrote:

Hello all,

What's the name for one of those knobs like you get on radio's for
volume controls where it keeps turning and there's no stops? And how
does it know which direction the knob was turned?

Thanks

gareth

Try "rotary encoder".

Specifically a quadrature rotary encoder. They have two outputs that
each generate N pulses per revolution (N being determined by the
resolution or sensitivity you desire). The two outputs are 90 degrees
out of phase, so as the knob is spun, software can determine which
direction it is spun by the phase relationship of the signals.

See http://en.wikipedia.org/wiki/Rotary_encoder

--
Paul Hovnanian paul@xxxxxxxxxxxxx
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