[hackpgh-discuss] Re: arduino in a nutshell
- From: Matthew Beckler <matthew@xxxxxxxxxxxx>
- To: hackpgh-discuss@xxxxxxxxxxxxx
- Date: Thu, 16 Aug 2012 20:31:16 -0400
Weird. So I guess if you want to supply regulated 5v, you are officially
supposed to wire it into a USB plug of the proper size for your specific
arduino instead of feeding it through the 5v pin. Interesting. Thanks for
the links, Jet.
-Matthew
On Thu, Aug 16, 2012 at 8:21 PM, j. eric townsend <jet@xxxxxxxxxxxx> wrote:
> It was ~5 years ago and I don't remember all the details, but I had a
> schematic that tried to feed the servos and the Arduino from the same power
> supply. Cranking up the power to feed the servos put more than +5v on
> their input and that bled into the Arduino feed one way or another.
>
> At the time there was a lot more cut-n-paste coding going on with
> different Arduinos than there should have been. I didn't know that minis I
> had were smaller in part due to removing protective circuits that existed
> on other boards. I fried at least one simply by drawing too much power off
> of it while it was on USB. The Mac lit up "shutting down USB due to power
> problems" and the Mini let out all the magic smoke.
>
>
>
>
> On 2012-08-16 20:10, jeff kephart wrote:
>
>> I'm reading "power fed back from a servo" and saying that it's then
>> !=regulated-5v is it?
>>
>> On Thu, Aug 16, 2012 at 8:06 PM, j. eric townsend <jet@xxxxxxxxxxxx>
>> wrote:
>>
>>> I dunno, I'm quoting the specs, advice on the arduino forum, and going on
>>> the rule I used for three semesters of class.
>>>
>>> There's documented places to provide power and given that there is a wide
>>> variation on how official Arduino boards I'll stick to the docs.
>>>
>>> Sure, "It works for me" could be true, but it is also volunteering to buy
>>> people replacement boards when it doesn't work for them.
>>>
>>> If I can find my dead boards I'll gladly trade them with working boards
>>> from
>>> anyone who thinks "it works for me" is a fine argument. :-)
>>>
>>>
>>> On 2012-08-16 19:59, Anthony Cascone wrote:
>>>
>>>>
>>>> Ummm... who's right? That contradicts what the previous two people said.
>>>>
>>>> On Aug 16, 2012 7:56 PM, "j. eric townsend" <jet@xxxxxxxxxxxx
>>>> <mailto:jet@xxxxxxxxxxxx>> wrote:
>>>>
>>>> He's right. Don't put +5v on the +5v *out* pin, but you can put it
>>>> on the Vin pin. (There's also Vref and common ground stuff to
>>>> contend with, but it's outside the scope of an intro document.)
>>>>
>>>> On 2012-08-16 13:31, Matthew Beckler wrote:
>>>>
>>>> Jet, thanks for the link!
>>>>
>>>> The arduino in a nutshell contains this line on page 5:
>>>>
>>>> "Don’t attach a 5V power source directly to the +5V pin though
>>>> —
>>>> it’s a
>>>> voltage output pin only, and you may fry your onboard
>>>> regulator.
>>>> Use the
>>>> USB connector instead."
>>>>
>>>> Any idea if that's legit? I've never heard of voltage
>>>> regulators
>>>> having
>>>> trouble with that sort of arrangement, and I've never broken an
>>>> arduino
>>>> by providing regulated 5v from my PSU to the 5v pin on the
>>>> headers.
>>>>
>>>> Thanks much,
>>>> Matthew
>>>>
>>>> On Thu, Aug 16, 2012 at 12:14 PM, jeff kephart
>>>> <n3glv1963@xxxxxxxxx <mailto:n3glv1963@xxxxxxxxx>
>>>> <mailto:n3glv1963@xxxxxxxxx <mailto:n3glv1963@xxxxxxxxx>>>
>>>> wrote:
>>>>
>>>> nice
>>>>
>>>> On Thu, Aug 16, 2012 at 11:30 AM, j. eric townsend
>>>> <jet@xxxxxxxxxxxx <mailto:jet@xxxxxxxxxxxx>
>>>> <mailto:jet@xxxxxxxxxxxx <mailto:jet@xxxxxxxxxxxx>>>
>>>> wrote:
>>>> > Including a PDF version, and like the how-to-solder
>>>> comic, free to
>>>> > distribute:
>>>> >
>>>> >
>>>> >
>>>> http://hci.rwth-aachen.de/__**arduino<http://hci.rwth-aachen.de/__arduino>
>>>>
>>>>
>>>> <http://hci.rwth-aachen.de/**arduino<http://hci.rwth-aachen.de/arduino>
>>>> >
>>>> >
>>>> >
>>>> > --
>>>> > J. Eric Townsend
>>>> > design: www.allartburns.org <
>>>> http://www.allartburns.org>
>>>> <http://www.allartburns.org>;
>>>> hacking: www.flatline.net <http://www.flatline.net>
>>>> <http://www.flatline.net>; HF: KG6ZVQ
>>>> > PGP: 0xD0D8C2E8 AC9B 0A23 C61A 1B4A 27C5 F799 A681 3C11
>>>> D0D8 C2E8
>>>> >
>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> J. Eric Townsend
>>>> design: www.allartburns.org <http://www.allartburns.org>; hacking:
>>>> www.flatline.net <http://www.flatline.net>; HF: KG6ZVQ
>>>> PGP: 0xD0D8C2E8 AC9B 0A23 C61A 1B4A 27C5 F799 A681 3C11 D0D8 C2E8
>>>>
>>>>
>>>
>>> --
>>> J. Eric Townsend
>>> design: www.allartburns.org; hacking: www.flatline.net; HF: KG6ZVQ
>>> PGP: 0xD0D8C2E8 AC9B 0A23 C61A 1B4A 27C5 F799 A681 3C11 D0D8 C2E8
>>>
>>>
>>
>>
>
> --
> J. Eric Townsend
> design: www.allartburns.org; hacking: www.flatline.net; HF: KG6ZVQ
> PGP: 0xD0D8C2E8 AC9B 0A23 C61A 1B4A 27C5 F799 A681 3C11 D0D8 C2E8
>
>
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