Splitting 24 volts for irrigation system

Other Hardware Hardware Development
1

Hi all, hopefully this is the right place for this question.
Anyways, I am trying to replace the controller I currently have for my drip irrigation system with a custom built one. The way it basically works is my garden is split into 2 main zones which each have a pump that opens when it receives 12 V.
My current plan is to have an Arduino controlling two relays which each allow power to flow to the irrigation pumps based on a timer, once I have a working prototype I plan on moving on to a web based controller but that's for much later in the project.
Basically, My question is that I have a 24V power supply, now I was wondering if there is an easy way to split it into 2 12V lines which can each be controlled individually by the relays and can be operated at different times. Is there an IC or something that could do that? I tried searching a whole bunch and couldn't find a solution also other irrigation system implementations worked very different than what I'm trying.
Thanks in advanced

Edit:
If possible it would be great to be able to power the Arduino with the 24 volts controller but that's not actually necessary, the original plan was just to use a 9V battery or something similar.

2

Some drip irrigation systems use 12VAC or 24VAC power supplies, which are not very useful for Arduino.

If yours is DC, then to provide 12V from 24 VDC, you need a step down converter that can handle the required current. Another to provide 5V for an Arduino.

Pololu has a good selection.

3

That's for the response,
About it being AC, it is totally possible that I just overlooked that when checking my power supply (it's the same power supply that my current controller uses) but I'm controlling it anyways using a relay so I should be fine (I think?)

About using a limiter to bring it down to 12V, if I do that doesn't that mean that I can only be powering one line at a time?

4

Is the power supply AC or DC? Do the pumps and valves expect AC or DC?

To "split" a 24V DC power supply to two 12V DC circuits, use two 12V step down regulators.

The grounds must all be connected, preferably at the power supply only.

5

Please post an annotated schematic of how you currently have it and another as to how you think it should be.

6

Ok so I just got home and was able to take a look. My old pumps took 12 volts AC my new(and currently installed) pumps are 24 volts AC each. So i think I should be able to simply connect the power adapter directly to the pumps and I guess operate them separately.

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