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Smart garden sounds amazing! My girlfriend would love that... Maybe I'll set that up with her!
Yes I actually have two of them. My backyard has three outdoor moisture sensors, so it can know if it's moist enough. It has a drop irrigation system connected to regular plastic pressure for tubing. It has two zones that can be controlled with two solenoids. It also has a 12V pump. All of that is powered by a 12V power supply and controlled by a four zone relay board. Remember to turn the power off to your outdoor sensors so that they don't destroy themselves when you're not sensing. You can also add a flow sensor to measure your water consumption.
As someone who has no idea how to do any of this, I think I might need to learn...
If you can do python and you can wire one part to one part, one part at a time, it's not hard, at least to me. Get the analog sensor, connect it to the analog to digital converter, connect all of their power to a relay, connect the relay and the converter to the pi, connect that to power. Then use Python to check the value in a loop, forever.