[TriEmbed] reply to Rodney about LED

[Rodney Radford]

After sending my previous email, i did think of a case where having the
resistor on the GND side helps (or VCC side if sinking instead of sourcing
current).  If you are driving several LEDs, you can use a single chip
resistor array for all the LEDs where the resistors are arranged in a
package with a single common lead on one side.

See the "Resistor arrays" section of this page:

http://www9.dw-world.de/rtc/infotheque/electronic_components/resistors.html

When using a part of this type, you tie the common end of the LEDS to GND
(or VCC) and then the other side to your microprocessor for source (or
sink) of each LED.



On Mon, Apr 21, 2014 at 12:33 PM, Grawburg <grawburg at myglnc.com> wrote:

> So the upshot is - be consistent in your projects.
>
> Brian
>
> -----Original Message-----
> From: "Rodney Radford" <ncgadgetry at gmail.com>
> To: "Grawburg" <grawburg at myglnc.com>
> Date: 04/21/14 12:31 PM
> Subject: Re: [TriEmbed] (no subject)
>
> The LED doesn't care whether the resistor in on GND or RPi side - just
> make sure LED us oriented correctly.
> On Apr 21, 2014 11:59 AM, "Grawburg" <grawburg at myglnc.com> wrote:
>
>> Looking at various projects for the Raspberry Pi I see LEDs wired with
>> the resistor between the GPIO and the LED anode and the cathode to ground,
>> and I see it wired with the resistor between the cathode and ground. The
>> first seems better (based upon what I'm learning from all of you), so I
>> wonder when is it better to connect the LED in the second manner, i.e.
>> ground--resistor--cathode?
>>
>> Thanks,
>> Brian Grawburg
>>
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