I would like to make/obtain a micro water dripping pump, as a component of an item I am designing, to irrigate a plant with a water drop every few seconds in a closed loop.
With "micro" I mean few cm³ in size. I imagine this should not be bigger than a walnut.
I insist on a closed loop, meaning the system isn't connected to a water input like water tap or such.
What technology is available? I would prefer a system with no or little electrical input.
Would such pump come ready-made or would I have to make it myself from scratch?