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Topic: 12v power supply (Read 3 times) previous topic - next topic

buteman


Hi all,
  I'm creating my first arduino project, and I'd like to power it with a car battery; it gives 12V-DC, and I think arduino can use it, but I have some external electronic components that need 5V (lcd, relay, etc).

Can I supply 12V to arduino, to Vin pin, and get 5V from the "5V" pin for external components?
It is a simple question, but I'm a newbie and I don't wont to break my arduino

Thanks

NO, DO NOT CONNECT 12volt to Vin Pin. You can only connect 5volt to Vin pin. You can safely connect the 12volt battery to the power in socket - positive centre negative outer.

Grumpy_Mike

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NO, DO NOT CONNECT 12volt to Vin Pin. You can only connect 5volt to Vin pin.

Sorry this is wrong.
Vin is connected to a voltage regulator. You can feed any voltage from 7.5V to 24V in this connection.

Docedison

Majenko, You have the Right of IT.

Doc
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"The solution of every problem is another problem." -Johann Wolfgang von Goethe
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JimboZA


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I'm really starting to wonder where this misunderstanding comes from

Not knowing ohms law and seeing that the arduino is "rated" at a small current and the power supply "rated" at a large current. They think the two ratings have to match before it is safe, like it is with voltage.
That is why I wrote this a few years back:-
http://www.thebox.myzen.co.uk/Tutorial/Power_Supplies.html


Mike on the subject of your tutorials, which I think are really good- except I was just reading the Power one, where you say this:

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Power is defined in Physics as the ability to do work


Wouldn't it be more correct to say that

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Energy is defined in Physics as the ability to do work, and Power is the rate at which that happens


(Energy and Work being in Joules, and Power in Joules/second....)
Roy from ITCrowd: Have you tried turning it off an on again?
I'm on LinkedIn: http://www.linkedin.com/in/jimbrownza

Grumpy_Mike

Yes good point. I was trying o keep it simple, looks like I over simplified it which is not what I aim to do.

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