[GLLUG] A question about electronics.

[Michael P. Flaga]

After the meeting I got your 8x5 matrix running on my Arduino UNO. I have uploaded a video <http://youtu.be/l1aqlFeOeck>  of it working along with a few working files and pictures <https://www.dropbox.com/sh/jfnevhmr4e9l8rz/AADhRbAMepGtuAUdnsGL02Rba?dl=0>  of the wiring. The code can be found at https://gist.github.com/4755b88540a6fa7b25a0.git

 

Note the pins are counter clock wise. Also as the Arduino's pins can only sink or supply about 20 milli-Amps, limiting resistors are not actually needed, in the case of just getting them to glow. If you want to make them brighter you will need to drive them something that can source/sink more current.  More info can be found at http://playground.arduino.cc/Main/LEDMatrix. Where these chips can be cascaded. Unlike the direct drive as one of 8x5's basically takes up all the pins on the UNO's 328 chip.

 

Whereas the above will get you displaying something. From there you can expand.

 

 

Michael P. Flaga, michael at flaga.net

 

 

-----Original Message-----
From: linux-user [mailto:linux-user-bounces at egr.msu.edu] On Behalf Of Charles Ulrich
Sent: Tuesday, November 25, 2014 5:08 PM
To: troy creed
Cc: linux-user at egr.msu.edu
Subject: Re: [GLLUG] Fwd: A question about electronics.

 

Hi Troy,

 

This appears to be the datasheet for that device: 

 <http://www.rogtronics.net/files/datasheets/leds/CSM58261EG-21.pdf> 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" < <mailto:charles at bityard.net> 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/> http://www.eevblog.com/forum/ [2]

>>  <https://forum.sparkfun.com/> 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 < <mailto:w8tcc.tcc at gmail.com> w8tcc.tcc at gmail.com>

>>> To:     Chick Tower < <mailto:c.e.tower at gmail.com> 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

>>>  <mailto:linux-user at egr.msu.edu> linux-user at egr.msu.edu

>>>  <http://mailman.egr.msu.edu/mailman/listinfo/linux-user> http://mailman.egr.msu.edu/mailman/listinfo/linux-user [1]

>> _______________________________________________

>> linux-user mailing list

>>  <mailto:linux-user at egr.msu.edu> linux-user at egr.msu.edu

>>  <http://mailman.egr.msu.edu/mailman/listinfo/linux-user> http://mailman.egr.msu.edu/mailman/listinfo/linux-user [1]

> 

> 

> Links:

> ------

> [1]  <http://mailman.egr.msu.edu/mailman/listinfo/linux-user> http://mailman.egr.msu.edu/mailman/listinfo/linux-user

> [2]  <http://www.eevblog.com/forum/> http://www.eevblog.com/forum/

> [3]  <https://forum.sparkfun.com/> https://forum.sparkfun.com/

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