I'm trying to use an arduino to regulate the air pressure in a balloon. Is there an actual pressure regulator that exists that can be controlled with the arduino directly? The only solutions I can currently come up with are the following:
1. Use a servo to turn the knob on the pressure regulator to modify the pressure.
2. Open a valve to increase pressure and use PD control to regulate it
3. have different valves connected to different pressure regulators and open the valve with the corresponding pressure we want.
The latter is the old implementation, but I feel like there must be an easier way to do this. I've looked online for pressure regulators, but I've found only industrial equipment. Is there any regulator that would work with small volumes and low pressures? (e.g. 1-2 cm^3, <75 psi)