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this post was submitted on 02 Jul 2023
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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.
Hey that sounds amazing, may I ask what moisture sensors you are using?
Edit: also automating sensor power draw sounds like something fun to work on. I'd love to test if having them power on just before or shortly before taking a reading and power off is feasible. Or if they need more time to get an accurate reading, finding the most optimal power cycle schedule to prolong sensor life while being able to take measurements at sensible times.
ACEIRMC 2set Soil Moisture... https://www.amazon.com/dp/B09JSND12L?ref=ppx_pop_mob_ap_share
They're just resistive electrodes with an analog sense of the conductivity of the soil, which is linearly correlated with moisture. It does this by applying a voltage to one side and sensing the current load to the other probe. This is exactly the same as electroplating, so if you keep them on 100% of the time, one will essentially dissolve in the dirt.
Instead, I run their power through a relay. I turn one relay on, it turns on all three of my sensors, I wait a few seconds, take three reads off each, one second apart, take the avg of each sensor, and record that. You can the save that to a timeseries database and host that locally too. Then plot that with Graphana.
To read the analog values, I use this: HiLetgo 3pcs ADS1115 16 Bit 16... https://www.amazon.com/dp/B07VPFLSMX?ref=ppx_pop_mob_ap_share
Now that you have logs, you can check moisture levels before activating your irrigation.
The next step is I have a set of float sensors in the rain barrel, towards the bottom. If the bottom one indicates empty it activates a solenoid to refill from the tap until the top one indicates full. They're about two inches apart.