## Rotational logic gates

"The wheels on the bus go round and round ..." - Traditional

The push-pull logic gates suffer from a great disadvantage, that
is inertia. The only way round this is to have some sort of amplifier, the mechanical equivalent of
the +ve line on a circuit board. Unfortunately with the push-pull system this is virtually impossible.
Instead I've gone right back to the drawing board and considered using rotation to represent the logic states.

I've taken the rotation of an axle, in any direction, to represent a logical one and the absence of rotation
(i.e. the axle is stationary) to be a logical zero. This has meant buffering is much more easy to achieve.

I've found no other web pages detailing using rotation to represent logic other than ideas presented for discussion. No one it seems has actually built anything and if they have it isn't on the internet as far as I am aware. Ok that's not quite true, the web page this NOT gate uses rotation as did the AND gate that used to be found at the
page "http://peach.mie.utoronto.ca/events/lego/lego-dinner-index.html". It is a shame the the latter site has gone as I would be interested to see how similar, if at all, their AND gate was to mine.

The underlying concept behind my rotational logic gates is the addition and subtraction of rotations. This isn't a new idea, there are other sites that have examples of this and people in their kindness have suggested it to me. Essentially, such additions and subtractions allows one to build up a series of outputs to represent, probably, anything you like for a given set of inputs. Each of the logic gate pages shows the basic algebra involved.

If you made any mechanical logic gates using rotation then please contact me.

The details of the rotational logic gates can be found on the following pages.