Sonoff 4CH Setup for Sequential Solenoid Valve Operation in Garden

Hi. I will be installing automatic watering in my garden, I am a bit green and have a few questions for you regarding the operation of such a watering system. The whole watering system will be based on a sunoff 4ch (4 channel) to each channel I want to connect an inverter/power supply from 230v to 12v. To the power supply I will connect a solenoid valve on 12v which will be open when power is applied. I will set the appropriate schedule in the application. What I mean is that each electro-valve will open one after the other. That is, 1 solenoid valve open for 30m, the rest closed, then the 2nd solenoid valve open for 30m. Is there any chance of this working?

Oddawajsanki wrote:

Is there any chance of this working ?

Yes, but why 12 VDC valves ? I have noticed in practice more corrosion of e.g. electro-valve terminals on DC supply due to electrolysis. Small 220 /24 V transformers would be more appropriate.

Krzysztof Kamienski wrote:

Oddawajsanki wrote:

Is there any chance of this working ?

Yes, but why 12 VDC valves ? I have noticed in practice more corrosion of e.g. electro-valve terminals on DC supply due to electrolysis. Small 220 /24 V transformers would be more appropriate.

I chose 12v valves because of the 25,- price on allegro. I found a sonoff 4ch pro model, there you can use 12v power supply but I do not know how to connect it.

https://www.youtube.com/watch?v=NHMbPSNayzU
Here you have an idea of the connection.

Krzysztof Kamienski wrote:

https://www.youtube.com/watch?v=NHMbPSNayzU

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if i connect a power supply e.g. 9v dc the output will also be 9v or is this separate power supply for each section

What power supply, such an output voltage. Sonoff has relay outputs.

Oddawajsanki wrote:

is this separate power supply for each section

And why so ? One 12 VDC power supply for everything.

Wait, I power the sonoff 230v by connecting 2 +- cables or through this socket with a 12v power supply. And I connect the 4 valves, do I also connect the power supply to them or what, I'm a bit green :p

@Oddawajsanki What power supply voltage does this Sonoff have ? 220 VAC or 12 VDC ?

Krzysztof Kamienski wrote:

@Oddawajsanki What power supply voltage does this Sonoff have ? 220 VAC or 12 VDC ??

.

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How is the connection supposed to look in this picture ?

in yellow I have marked the input I will use

It is better to power the Sonoff from 220VAC, in parallel with the input of the 12 VDC power supply. This will prevent damage to the Sonoff, through feedback pulses generated by valve coil inductions.

Krzysztof Kamienski wrote:

Preferably power the Sonoff from 220VAC, in parallel with the input of the 12 VDC power supply. This will prevent damage to the Sonoff, through feedback pulses generated by valve coil inductions.

ok, I will still ask. I will be buying these valves: https://allegro.pl/oferta/elektrozawor-12v-1-2-cala-dn15-nc-0-8mpa-9256815456
I have a pressure of about 4 bar. Is it sensible to buy such valves or is it better to go for better ones, I will have this whole controller in the garage and the cables will go outside to the box where these valves will be, in case something leaks and makes a short circuit could something happen, should I additionally install fuses on each one.

A 2 A fuse can be inserted in the circuit of each valve and the same in the 220VAC supply circuit.

Krzysztof Kamienski wrote:

I can insert a 2 amp fuse in the circuit of each valve and the same in the 220VAC supply circuit.

OK, in that case many thanks for your help .
Greetings.

Why are you thinking about 12V? In watering, 24V and valves of this type are standard Link and here is the whole list: Link .

krzbor wrote:

Why are you thinking 12V? In watering, 24V and valves of this type are standard Link and here's the whole list: Link

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Because of the price I want to use a cheaper. 12v because the solenoid valve I want to use is powered by this voltage. I have included the link below.
LINK .

And have you noticed that in irrigation valves the standard is 1" possibly 3/4" and your valve is 1/2"? The auction description doesn't mention flow rate, and this is an important attribute if you're going to have sprinklers - simply put, the valve can't dampen the flow. Another parameter of your valve - a run time of 45 minutes. With irrigation valves I have not seen such a restriction anywhere.

Poorly selected electro-valve. Too little flow, but for watering plants in pots it can be. If you are already very insistent on these valves they have a flow of about 6-10L/mim also depends on the pressure. They could be used if you increase the number of sprinklers with a smaller intake, e.g. from the mprotator 1000 or 2000 series. Considering the larger number of sprinklers, pipes, fittings, electro-valves, the installation will be expensive and quite unreliable. As the valves from the link heat up a lot and cannot run open for too long. A not much more expensive dedicated valve (e.g. PGV100) 24VAC will be a better solution. Apart from that, the industry case for the Sonoff controller somehow doesn't particularly lend itself to being programmed as a sequential controller, unless you write the program for the ESP yourself. Somehow this is not a very cost-effective, labour-intensive and uncertain solution you want to use.

Let us know how it goes for you too I was thinking of auto watering vegetables but from a barrel.
The ready-made ones from Aliexpress are terribly expensive.

Irrigation or fertilisation of vegetables is very cheap when compared to greenhouses or lawns. 100 nozzles cost 40PLN, the number of pipes depends on the size of the crop. I think that if you have a voltage source and you don't have to put up photovoltaic cells or build a windmill, the cost of such a small vegetable garden should not exceed 250-500zł. Making a lawn irrigation system is already a thousand zlotys. The valves which the author of the subject wants to apply will raise one medium sprinkler. Taking into account that on average you will need about 15-20pcs if the lawn is not a rectangle, these valves will come out quite expensive. The price would come down if he used dedicated valves. Like the aforementioned PGV100 or any other for irrigation systems with a cross-section greater than 25mm. That is, a water throughput of about 60L/min.

The automatic watering will be used for watering the shrubs, using pulsating sprinklers, and one valve for watering the greenhouse, where I will use a hose with holes.