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Looking for a 5V valve to be driven by ARDUINO

Hi everybody,

I am working on a project to make an automatic watering system driven by arduino. I am looking for a valve which I could operate without any extra power supply but the 5V from the ARDUINO.
It would be perfect if the valve could be in the range of the 6mm for tubes connections.
As my project will rely on gravity for water movements, I don't want to use a pump or whatever active device. Just some standard batteries connected to ARDUINO.
Do some of you know such a valve?
I have looked on the net without any success. I have found loads of watering projects using arduino but none with the same phylosphy. If you know one, please let me know.

Regards,

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BaptisteL8 (author) 1 month ago

Hi guys,

thanks for your interest and help. finally I have changed option and will do an automatic mechanical valve. I have printed part and I am ready to assemble and make the whole thing (hopefully) work.

I found this option on 3Dponics.com which is a very interesting website, both for their projects and for the philosophy they have (open source, 3D printing etc..).

Love that website.

Toga_Dan1 month ago

possible solution. Get a little electronic blood pressure cuff. Gut it for the valve. 3v. 3 mm.

Toga_Dan1 month ago

here's a little insight into what is already out there. a 24 volt valve will run on 12 volts. the solenoid takes a quarter amp at 24 volts.This is current which is drawn as long as the valve is open. Can you afford that current with your batteries?

with a Servo motor there would be zero current while the valve is open. only while the valve is opening or closing will there be current demand.

option : use a servo to pinch a piece of soft tubing shut. This is your own valve and very simple. It should work fine for low pressure water.

BaptisteL8 (author)  Toga_Dan1 month ago

Hi Toga,

Thanks for your insights. I will look at it soon.

I have found some items which seems to be promising:

https://www.amazon.fr/3-6V-0-4-0-5kgf-Frame-Magnet...

https://www.amazon.fr/3mm-Tube-Electrovanne-Electr...

Still have to look further at them.

I guess I will have an extra battery for the valve but as a first step I would like it to last 3 weeks max.

I try not to re-invent the wheel if i can help it. So, yeah. Shoppin is good.

My French aint so good, so i ran a googletranslate.

neither of those is CURRENTLY available. But maybe this is an indication that french speakers buy and sell this more often.

3mm to Tube 3mm Gas Solenoid Valve Solenoid DC 5V 0.4-0.5kgf / cm2
From DealMux
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Currently unavailable.
We do not know when or if this item will be back in stock.
Product Name: Electromagnetic solenoid valve; Rated voltage: DC 5V; Current Rating: 263mA
Stroke Rating and Strength (Min.): 0.4-0.5kgf / cm²; Max Power On Time: 1 Seconds (Max): 0.25 "x 0.39" (L * W * H)
Electrified rate: 10%; Mounting hole connector: 3 mm to 3 mm
External Material: Alloy, Electronic parts; Main Color: As Shown Image
Package contents; 5g: 1 x Solenoid Solenoid Valve Weight
Toga_Dan1 month ago

I imagine that if 100 million people wanted this, it would be available off the shelf. Meanwhile,

http://hackaday.com/2014/09/27/automated-watering-system-uses-neat-diy-water-valve/

I've seen some factory pinch valves. some don't list required voltage. One valve I saw needed 24 v and was $150. I think that was medical equip.

Toga_Dan1 month ago

how high is your gravity feed tank?

Is the water in the tank clean

You are using 6mm tubing?

How far does the tubing go?

BaptisteL8 (author)  Toga_Dan1 month ago

My project is about making a gravity watering system for an urban balcony garden. I still have to fine tuned the desgin but mostly it will be:

- Water drop about 1m/1,5m up to 2m depending of the final solution I will choose for the tank. I have to fix it either on my balcony fence or on the building wall and be able to feed it with water if needed.

- I will use both rain water and upcycled used water such as kitchen water (used to clean vegetables for example etc...) water will not be 100% clean so I planned to have 3 stages filters: I will fix main tube (near the bottom of the tank but not exactly on the bottom to avoid sands ect...); covering this connection, I will position a box with 2 filters, one for big materials such as woods, leaves etc... one for smaller materials such as sands. The final filter is integrated within the drip irrigation system.

- I have both 6mm and 8mm tubing for the drip system (but I have a longer 6mm) and a standard hose. Length are still to be determined, but as I am on a balcony we are talking about some meters maximum (total length of my balcony is 15m and my wife doesn't envisage my project to occupy the whole area ;-) ).

I have made a rapid sketch to illustrate the project.

Thx for your help and contribution if you have good advices and ideas to share

Scan1.jpg

Make one...
Take a 12V version and replace the coil wiring.
Problem is that you need quite a bit of power to move a valve, unlike a relay.
I think you would have more luck using a servo on a small valve but still not easy to find one in 5V.

or. Replace the solonoid return spring with a lighter one.

I do see 5v servos online. Use it to pull the solonoid piston.

How would one rewire the solonoid to pull just as hard with less than 1/2 the V?

Actually, test 1. Will an unmodified 12v solonoid open with 5 v?

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