h a l f b a k e r yExpensive, difficult, slightly dangerous, not particularly effective... I'm on a roll.
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A plastic platform with attached dominoes in different logical
configurations.
These would be a lot easier to set up than regular dominos. Just
turn the upside down, slide them into the breadboard and then
flip
over and you are ready to set the domino effect in motion to run
any
program
you can design.
You would have to experiment with what regular size to make
each
square so that you could fit all of the logical operations on the
same
sized squares, so they would be interchangeable.
Then put them up on thingiverse so everyone can download them
and print them out.
Domino logic
https://www.youtube...watch?v=lNuPy-r1GuQ
[tatterdemalion, Jun 01 2014]
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NAND gates could be a challenge. Someone needs
to get to work on the donimo server platform... |
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Domino NOT gates in general would be difficult,
unless you have some kind of grey-code. |
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A Google image search turns up many domino logic
gates |
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//Domino NOT gates in general would be difficult, unless you have some kind of grey-code.// |
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I think domino NOT gates are conceptually equivalent to electronic NOT gates. In both you need a hidden supply of 'ones'. |
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NOT gates can be implemented as: a XOR 1 = ~a.
That implements Loris's hidden supply of 1s. Or
course implementing an XOR is tricky because it is
timing dependent. Since each input and output
can only change once from a 0 to a 1, the gate
must have some delay after the first input goes to
1 during which receiving a second 1 will prevent
the 1 from being sent out the output. And if the
the XOR is after some other logic, the propagation
times could be hard to predict. To deal with that,
you could put both inputs through AND gates that
are triggered by a 1 that is delayed longer than the
expected propagation time of the other two
inputs. |
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And after all that you're still restricted to
combinational logic. Any state machine would
require resetting the dominoes. One sort of work
around is to simply create a full copy of your entire
logic circuit for every cycle you'd like to perform. |
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One idea to implement state machines at the cost
of possibly violating traditional domino restrictions
would be to mount them inside a large rolling
cylinder. Normal domino action would happen on
the bottom, but as the domino modules rotated
upside down they would get reset. The length of
the cycle would of course need to match the
circumference of the cylinder, and all the
dominoes would need to be falling generally
forward. Any domino path that tried to backtrack
wouldn't get reset properly. This would also make
timing easier because the domino propagation
rate would actually be controlled by the cylinder
rotation speed. |
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I too was thinking that if you knew exactly what logic you wanted then you could use a resetting device to allow loops.
Suppose that you had each domino standing on a small plinth, then after falling it would be out of the way. I imagine a bowling-pin style resetting device, sweeping off the untriggered dominos before laying down the new set. |
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