[GLLUG] Fwd: A question about electronics.

[Charles Ulrich]

Hi Troy,

This appears to be the datasheet for that device: 
http://www.rogtronics.net/files/datasheets/leds/CSM58261EG-21.pdf

Page 2 has the pinout. Each "pixel" has two LEDs in it, a red and a 
green. It looks like a simple matrix configuration, no multiplexing or 
shift registers needed. Each row has all of the anodes tied together and 
each column has all of the cathodes tied together.

So for example, to light up the uppermost left red LED, you would apply 
a couple volts to pin 16 and ground pin 18. To light the green LED in 
the same pixel, you would ground pin 1 instead.

Keep in mind that a forward-biased diode is almost a short circuit, so 
you need to limit the current with a resistor to avoid letting all the 
smoke out.

Hope this helps!

Thanks,
Charles

On 2014-11-25 16:33, troy creed wrote:
> I got a bunch of these at a ham swap. But now I am trying to light
> them up. The display is: CSM-58261EG orange-red, yellow-green. I have
> lit some LEDs, and I can't figure out the pattern. Troy
> On Nov 25, 2014 3:20 PM, "Charles Ulrich" <charles at bityard.net> wrote:
> 
>> There's not really enough info in Troy's question to be able to
>> construct a helpful answer. What's the model number of the display?
>> Where's the datasheet? The datasheet should have the pinout in it.
>> Does it just not make sense? (E.g. not in English?)
>> 
>> While I'm sure there are many people who are both Linux and
>> electronics enthusiasts on the list, there are oodles of forums out
>> there that might be a better fit for electronics-only questions.
>> These are some that I know about:
>> 
>> http://www.eevblog.com/forum/ [2]
>> https://forum.sparkfun.com/ [3]
>> 
>> Hopefully this will help Troy get pointed in a fruitful direction.
>> 
>> Thanks,
>> Charles
>> 
>> On 2014-11-25 14:56, Chick Tower wrote:
>> 
>>> Can anyone help out Troy?
>>> 
>>> -------- Forwarded Message --------
>>> Subject:        A question about electronics.
>>> Date:   Tue, 25 Nov 2014 13:44:39 -0500
>>> From:   troy creed <w8tcc.tcc at gmail.com>
>>> To:     Chick Tower <c.e.tower at gmail.com>
>>> 
>>> Hi, my name is Troy Creed. I am an electronics enthusiast and
>>> also a
>>> microcontroller programmer.
>>> 
>>> I have a problem and I just can't figure it out. Do you or anyone
>>> in
>>> GLLUG do these kinds of things. In particular, a 5x8 multicolored
>>> led
>>> display. I just cannot figure the pin out to get started.
>>> 
>>> Can you help, or can anyone help. The display is Chinese and
>>> there is
>>> nothing I can find on the internet except the data sheet. It may
>>> be the
>>> document I need but I don't know how to use it.
>>> 
>>> Is there any help for me?
>>> 
>>> Thanks, troy
>>> 
>>> _______________________________________________
>>> linux-user mailing list
>>> linux-user at egr.msu.edu
>>> http://mailman.egr.msu.edu/mailman/listinfo/linux-user [1]
>> _______________________________________________
>> linux-user mailing list
>> linux-user at egr.msu.edu
>> http://mailman.egr.msu.edu/mailman/listinfo/linux-user [1]
> 
> 
> Links:
> ------
> [1] http://mailman.egr.msu.edu/mailman/listinfo/linux-user
> [2] http://www.eevblog.com/forum/
> [3] https://forum.sparkfun.com/