Changing the pressure of the water tube

Hi every1,
I have a question, which most likely you wont be able to answer/help with, anyway:
Me and my group (we are students) are looking forward to implement one of the aspects for our study project, which is: control of water in tubes (or something similar) by arduino. Basically we want to create something like "audio visualizer" with water, thus we would like to control pressure in the tubes (atleast 1 tube at first) by arduino. Any ideas on how we could possibly implement this or something like that/similar?

which most likely you wont be able to answer/help with

Well, that's a positive start hey?

Basically we want to create something like "audio visualizer" with water

Whatever that means.

You were right; most won't be able to answer, because the question doesn't make much sense.

Can you add a squeezable section to the tube, and then let the ardiuno control the mechanical squeezing of the tube?
Or think turkey baster, squeeze a rubber bulb attached to the tube.

Just to make it clear:
audio visualizer - is something, that represents the intensity/volume of certain audio frequencies as some visualization, f.e. the visualization you can see in windows media player/winamp, or just go to Google images and search: "audio visualizer" and you'll find tons of examples.
The idea with water is that the pressure in the water tube would be changed and the water will go up. The representation of the intensity of a certain frequency will be shown as a level/height of a water in it's tube. The way that the frequencies are analyzed and numbers are given(programming) is not a problem, but the way that the water level/height would be controlled (possibly with controlling the pressure inside the tube) is a problem that i'm looking forward to solve/find solution for,

Hopefully it makes sense

SFE has : https://www.sparkfun.com/products/10456

I'd go with a servo squeezing the turkey baster bulb.

I'd actually go for a single-ended hydraulic cylinder actuated by a high-speed linear actuator, or maybe a solenoid, or something of that nature...

The idea with water is that the pressure in the water tube would be changed and the water will go up

If you change the pressure of a liquid in a vessel, the only thing that goes up is the strain on the vessel walls.

AWOL:

The idea with water is that the pressure in the water tube would be changed and the water will go up

If you change the pressure of a liquid in a vessel, the only thing that goes up is the strain on the vessel walls.

Not if there is an airspace above the liquid.

Not if there is an airspace above the liquid.

?

A liquid is (mostly) incompressible, and by inference, unexpandable.
How can increasing its pressure cause it rise?
That would be increasing its volume, not its pressure.

Each pipe could be a simple u-tube, where you blow in one side and the water in the other leg goes up- release the breath it goes down. So hook one end up to a pneumatic pump / valve arrangement and control that with the Arduino.

I'm not sure water's inertia is going to give this the kind of response you want though?