# COMMUNITY : FORUMS : TECH

## 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.

4 years ago
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.
4 years ago
Try it, see how much force the tubes take to close. A coil needs a core to work efficiently
4 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.
Actually I wont be using solenoids, as you mentioned the high price. But instead what I mentioned above the U shaped wire and magnet.
4 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.