[Lab] arduino power adapter rating

[Jean-Marc LeBlanc]

When you see 500mA on the power supply, that only means the current
will not exceed 500 mA.  It is common that people thinks its going to
push 500mA to your device, but that is not the case.

Jean-Marc Le Blanc
---

"Do you pine for the nice days of Minix-1.1, when men were men and
wrote their own device drivers?" Linus Torvalds




On Thu, Jul 21, 2011 at 6:08 PM, Emil Mitev <quanttrom at gmail.com> wrote:
> You should be fine. But if you wanna be SUPER 110% sure here is some more
> info.
> You can never give it too much current. Period.
> The only thing that you MAY be worried about is too high voltage if the
> power supply is transformer based (eg not switching mode power supply)
> because if they are not loaded they will give you a higher voltage.
> Eg if your power supply is rated at 9VDC @ 500mA, the voltage will be 9V
> when there is 500mA of current drawn from it. It will be higher when the
> power supply is not loaded.
> A transformer based power supply are the old chunky heavy things. A
> switching mode one is lighter guys that most electronics use today
> Emil
>
>
> On Thu, Jul 21, 2011 at 5:17 PM, mike sorensen <mikeysorensen at hotmail.com>
> wrote:
>>
>> I was mostly concerned about giving it too much power and blowing
>> something. I gather the on board regulator prevents that.
>>
>> > Date: Thu, 21 Jul 2011 17:03:37 -0400
>> > Subject: Re: [Lab] arduino power adapter rating
>> > From: jeanmarc.leblanc at gmail.com
>> > To: darcy at siteware.com
>> > CC: mikeysorensen at hotmail.com; lab at artengine.ca
>> >
>> > sorry that is if its running at 1.8V but it would be very small still
>> >
>> > Jean-Marc Le Blanc
>> > ---
>> >
>> > "Do you pine for the nice days of Minix-1.1, when men were men and
>> > wrote their own device drivers?" Linus Torvalds
>> >
>> >
>> >
>> >
>> > On Thu, Jul 21, 2011 at 5:01 PM, Jean-Marc LeBlanc
>> > <jeanmarc.leblanc at gmail.com> wrote:
>> > > should be good your arduino.  the ATMega 168 I takes less than 5 ma.
>> > > So the power supply will be mostly for powering every thing else you
>> > > will have hooked up to it.
>> > >
>> > > Jean-Marc Le Blanc
>> > > ---
>> > >
>> > > "Do you pine for the nice days of Minix-1.1, when men were men and
>> > > wrote their own device drivers?" Linus Torvalds
>> > >
>> > >
>> > >
>> > >
>> > > On Thu, Jul 21, 2011 at 4:50 PM, Darcy Whyte <darcy at siteware.com>
>> > > wrote:
>> > >>
>> > >> I don't think it matters.
>> > >> There's no such thing as too much amperage. Your arduino will only
>> > >> draw what
>> > >> it needs.
>> > >> I'm sure you'll be fine with that one for a while.
>> > >> What are you planning on running from the arduino?
>> > >>
>> > >> On Thu, Jul 21, 2011 at 4:43 PM, mike sorensen
>> > >> <mikeysorensen at hotmail.com>
>> > >> wrote:
>> > >>>
>> > >>> Just got the arduino duemilanove. What are people using for a power
>> > >>> adapter? I picked an adapter that runs at 9V since the manual
>> > >>> suggest
>> > >>> anywhere from 7-12V. It doesn't mention anything about amperage. I
>> > >>> tried
>> > >>> searching google and get anything from 40 mA to 1 amp. My adapter is
>> > >>> rated
>> > >>> 500mA. Does this sound reasonable? Too much? not enough?
>> > >>>
>> > >>> mike
>> > >>>
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>> > >>
>> > >>
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>> > >
>>
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