Multiplexing and DeMultiplexing

Hello, I first was wondering if anybody knew anything about Multiplexing? if so then you will understand my question here :)

So basically I have this crude diagram that will explain what i'm talking about: http://i.imgur.com/T0V5zV5.png?1

now my problem is I now have 9 control signal wires, is there any way around this?

Again if you know about multiplexing then you should hopefully understand my question, based on the diagram. 

thanks for the help :)



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mrn (author) 4 years ago
I apologize for the all the confusion.

Basically I need a grid of 64x64 64 rows and 64 columns, controlled by either 8 595's or 2 MAX7221's

the points on the grid are made up of some type of tiny valve, that regulates fluid.
So when the valve is activated, it is opened for a tiny fraction of a second, letting in a tiny amount of fluid, down a small tube.

as steveastrouk stated there is trade offs for using the 595's verses the MAX7221's
Pricing is a consideration also.

My very large problem at the moment however is a suitable valve, that is 1/8 of a inch
that can block fluid, about the consistency of water possibly a little thicker.

My first thought was a simple magnet and wire, where there would be a very tiny U shaped piece of copper wire, and above that a tiny magnet, ans so when the wire is activated(applied voltage) it gets attracted to the magnet above it, thus opening a small crevice for fluid to flow down the tube.

Copper wire isn't magnetic, so your coil won't attract it !
You will be shocked how much force it takes to pinch off the tube.
mrn (author)  steveastrouk4 years ago
But you apply a voltage to the wire making a tiny electromagnet. right?
I know it isn't a coil however, from a simple test I did, it still works well.


I wont be pinching the tube, instead think of a flapper, sitting on the top of the tube, and when it opens, fluid flows into the tube.
Try it, see how much force the tubes take to close. A coil needs a core to work efficiently
caitlinsdad mrn4 years ago
So I take it this was all about building the ultimate bartending bot without your parents finding out. That's 4096 solenoid valves you're looking at controlling. $$$ or whatever your currency is.
mrn (author)  caitlinsdad4 years ago
Actually I wont be using solenoids, as you mentioned the high price. But instead what I mentioned above the U shaped wire and magnet.
caitlinsdad mrn4 years ago
How did you intend to unstick the wire from the magnet to drop the wire so it closes your opening again? You have to have a good seal to block the liquid.
mrn (author)  caitlinsdad4 years ago
when the voltage is let go the wire will drop back down, ill be using a material that is super light and flimsy so that the weight of the wire will push it back down.

However as you mentioned sealing this from the liquid would be hard.

there is no way that this will block fluid, I don't think anyways.
caitlinsdad mrn4 years ago
Which brings us back to your original question. Why do you have 9 control wires? Each with a different number for each stage of your muxing demuxing? What are they for and what are you using to provide the control signals? It comes down to what you are doing. How did it change from LEDs to control valves? If it is an idea you want to discuss, fine, but it is hard to help if you can't specify what you are trying to do which shows you don't know what you want to do.
Use a MAX7221.
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