I want to make a device that can control a small solenoid valve for dispensing fluids. Basically a circuit which powers on and off the solenoid at different times to allow the fluid to flow. The fluids will be gravity fed so very little pressure is needed. Most of the solenoid valves that I have found are like 100 dollars or more which is way too expensive for this project.
Does anyone know if there are any small inexpensive solenoids, or something similar, that would do what I want? I'd like the flow rate to be about 1 ounce per 5 seconds or somewhere around there but I can reduce the flow if it's more than that.