I was looking to create a smart garden with moister sensors which (when the water level is too low) opens a valve watering a specific area of the garden. I was just wondering what parts I would need for such a system. Thank yout!
Based on you requirements, you need the same number of moisture sensors as you have sprinklers and the same number of valves.
Then if you are going to use an Arduino to monitor and control this, you need one input pin (possible more) for each moisture sensor and one output pin for each valve.
Hope that helps, you decide.