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5v Power Supply
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5v Power Supply

by jbrad on Wed Apr 25, 2018 1:49 pm

Working with the mini push pull 5v solenoid. Can any suggest an appropriate power supply that I can plug straight into my Arduino (USB power from my computer isn't enough to get it moving).

Thanks

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Re: 5v Power Supply

by adafruit_support_bill on Wed Apr 25, 2018 2:03 pm

The solenoid needs 1.1A @5v. This 2A adapter should be sufficient.

https://www.adafruit.com/product/1994

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Re: 5v Power Supply

by jbrad on Wed Apr 25, 2018 2:50 pm

thanks for the quick response! And this might be a stupid follow up.

But I did try using the USB brick from an IPhone 7 with my Arduino USB cable with the same results as my computer. I believe the iPhone USB brick is rated at 5V and 1amp (should be enough for solenoid, right?).

solenoid would only activate when one end was given a 'nudge' to overcome lack of power.

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Re: 5v Power Supply

by adafruit_support_bill on Wed Apr 25, 2018 3:06 pm

It depends on how that power supply responds to a slight overload. The solenoid has a resistance of 4.5ohms which means that at 5v, it will draw 1.11 amps. With many power supplies, the output voltage will drop as they approach or exceed their rated output. If you have a multimeter, you can try measuring the voltage at the solenoid terminals when powered by your iPhone adapter.

Another possibility is some voltage drop due to the resistance in your USB cable. This tends to be more of a problem with very thin or very long cables. You can test with a different cable if you have one.

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Re: 5v Power Supply

by franklin97355 on Wed Apr 25, 2018 10:20 pm

How are you connecting the solenoid to the power? Can you post a picture?

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Re: 5v Power Supply

by jbrad on Thu Apr 26, 2018 2:10 pm

have been connecting with the standard yellow USB cable that came with the beginner Arduino Kit (cable from PC USB to Ardunio board). I am going to try a 5v 2amp wall adaptor and trying going from that to board and test results.

THANKS!

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Re: 5v Power Supply

by franklin97355 on Thu Apr 26, 2018 3:03 pm

The pins on an Arduino do not have enough current to power a solenoid. Are you using a power transistor and diode as shown here?

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Re: 5v Power Supply

by jbrad on Thu Apr 26, 2018 4:45 pm

new to this world. so followed the instruction found here https://core-electronics.com.au/tutoria ... duino.html

So yes using both a power transistor and a diode.

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Re: 5v Power Supply

by jbrad on Thu Apr 26, 2018 10:43 pm

So i tried running it with an iPad charger (5.2v 2.4amp) should have been plenty to get the solenoid moving but still no. Need to nudge it for it to overcome its “home” position.

Any thoughts??

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Re: 5v Power Supply

by adafruit_support_bill on Fri Apr 27, 2018 5:49 am

We can try replacing the solenoid. Please contact support@adafruit.com with a link to this thread.

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Re: 5v Power Supply

by jbrad on Fri Apr 27, 2018 7:26 am

I appreciate the offer but I actually purchased 2 and both do the same thing... don’t think it’s the solednoid...

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Re: 5v Power Supply

by adafruit_support_bill on Fri Apr 27, 2018 7:48 am

Let me check what we currently have in stock to see if there has been a specification change.

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Re: 5v Power Supply

by adafruit2 on Fri Apr 27, 2018 11:04 am

oddly enough i just used some for a project, but they worked fine.
i'm using a ULN2003 and a 5V 2A wall adapter - what are you using the switch the solenoid?

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