I'd like to have electronic control of the open/close timing of a source of air at the bottom of a tank of liquid such that I have control of when a single bubble is formed.
Experimentation would be required but I expect the open period to be at most 250ms - the more scope for lower period options the better.
The process of bubble forming would be repeated over and over again - with a 50% duty-cycle the frequency of new bubble formation would be a minimum of 2Hz.
Let's say 5~10Hz would be ideal.
Multiple bubbles will need to be formed in close vicinity (~10mm) so the device would either have an appropriate form-factor, or some kind of tubing system would be put in place.
I will have close to arbitrary control over the control signals, but I expect some form of digital control per 'channel', preferably parallel and direct, i.e.
1=open, as opposed to some kind of interpreted data stream.
Although I understand that the dynamics of bubbles will be all over the place, in terms of control I'd expect low latency.
Question: what kind of devices am I looking at here?
Are there off the shelf components that can do this? Cost is a concern at some level but is not necessarily the overriding requirement.