Opensprinkler 3 DC – Wiring question

[JayAr]

Hi,
i got my opensprinkler3 DC yesterday and got a bit stuck about – how to correctly wire everything.
maybe its a dump question – but the documentation is thin:
24V AC – how does it connect?

Symbols + and – are just to show the two different cables. As far as i understood it is regardless which way around?!

24AVC
+ -
                           +?  -?  ?
opensprinkler GND SN1 SN2 VIN COM-COM 1 2 3 4 5 6 7 8
                                  -?    +
+ -
Pump

Some Photos
https://goo.gl/photos/7ampFjNd1EQ3N7vR6

[Ray]

The setup guide explains the wiring: COM (common) wire goes to the COM terminal (either of the two).

For example, if you have 6 valves, the common wire goes to COM terminal, and each individual zone wire goes to a zone port (say zones 1 to 6 ports).

VIN outputs +5V, and that’s used for sensors that require +5V power. It’s not for valves.

[Britaway]

Hi, I’m also a bit lost here. I have the OpenSprinkler V2.3 DC and 24VAC Gardena valves. Its a new build so I don’t have a 24VAC power supply (but could get one). Do I just connect one of each of the solenoid wires to COM and the other wire to the 1-8 row? I then power the unit with a phone charger to the USB plug, connect the Ethernet cable and good to start watering?
Any help would be appreciated as I have all the bits but still watering the garden every day by hand!

Many thanks,

Peter

[Ray]

If you have OpenSprinkler DC — please do NOT use 24VAC power supply. The instructions are very clear about never using 24VAC power supply on OpenSprinkler DC. Because of the way OpenSprinkler DC works, you should only use a low-voltage DC power supply (the one that comes with the controller is 7.5VDC 1AMP, and you can use your own, anywhere from 5VDC to 12VDC is fine).

In theory you can also power the controller using a USB cable connected to a USB adapter like phone charger. Though the 5V from USB charger is a bit low, it is often sufficient to drive solenoid valves.

About wiring valves: this is fairly standard: each valve has 2 wires. One wire from each valve should come together and that goes to the COM (common) terminal (there are two COM ports, either one is fine). The other wire from each valves goes to an individual station port (1 through 8). So if you have 5 valves, there should be 1 COMMON wire, and 5 individual zone wires.

[maszkows]

hello,

i cant find it clear.
my setup requires running 24VAC valves
and i have OpenSprinkler 2.3 DC
how i need to supply power needed by 24V valves. where to connect 24V supply and how to control it with OpenSprinkler DC?

each valve draws 300mA
my old sprinkler controller(hunter) was providing 24V to valves and it was switching 24V ON/OFF to control each valve.

can any one draw simple diagram?

br
Daniel

[maszkows]

ok I will replay to this myself.

I closed my eyes blind and connected 24VAC valved to OpenSprinkler 2.3 DC controller powered from 7.5V
– Common wire from valves to Common plug on OpenSprinkler.
– and each valve control wire to OpenSprinkler 2.3 DC control port.

and I run test program to open and close Valve and………. it just worked.
Valves are opening and closing no problem. 🙂

br
Daniel

[Ray]

Glad to hear it worked. Yes, to summarize: OpenSprinkler DC uses a low-voltage DC power adapter, and it drives 24VAC solenoid valves directly without 24VAC power. If you want to find out how it works technically, here is a blog post:
https://opensprinkler.com/announcing-the-first-dc-powered-opensprinkler-v2-3-dc/

[Author]

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