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1  Using Arduino / LEDs and Multiplexing / Re: LED Matrix Pinout on: February 25, 2013, 08:32:09 pm
Thanks for the help, looking through it never thought of that.  smiley


Working Display
http://i.imgur.com/UHH8D8u.jpg


Pins with sticky note numbers
http://i.imgur.com/hkN6K3B.jpg

I didnt want to embed these because they are huge.
2  Using Arduino / LEDs and Multiplexing / LED Matrix Pinout on: February 25, 2013, 07:10:45 pm
My led matrices (EC40-11GWB) came in a few days ago. After reading the data sheet: http://shop.emscdn.com/im/LED/EC40-11GWB.pdf I was unable to find out which pins on the matrix controlled which leds. Can someone tell me how to count the pins on the matrix so I can match it up to the data sheet. Ill post a picture after I find my camera.
3  Using Arduino / LEDs and Multiplexing / Re: Cheap LED Matrix on: January 12, 2013, 03:37:00 pm
After skimming the MAX6953 data sheet a few times I thought of something. Do I need resistors between each screen and the chip? Does any body have a schematic. If not could some one maybe make one(Please). Also if some one told me what was needed I could make it and post it for everyone.
4  Using Arduino / LEDs and Multiplexing / Re: Cheap LED Matrix on: January 10, 2013, 07:02:49 pm
Thanks everyone for the help!
5  Using Arduino / LEDs and Multiplexing / Re: Cheap LED Matrix on: January 07, 2013, 08:28:59 pm

I think this is going to be my book. Thanks!

$25 is nuts - go to maxim-ic.com and request a sample in DIP footprint. The part works very nice.

This looks great, a free sample is way better than $25.

There is no difference between common cathode & common anode:

Could someone else please clarify this, there is two different answers now.
6  Using Arduino / LEDs and Multiplexing / Re: Cheap LED Matrix on: January 06, 2013, 05:49:39 pm
The MAX7219/MAX7221 are compact, serial input/output
common-cathode display drivers...

http://datasheets.maximintegrated.com/en/ds/MAX7219-MAX7221.pdf

Thanks, wow my searching skills are sure lacking today. Ill keep looking thanks for everyone's help. Just one last question does anyone have a good beginner (or advanced) circuit book that they could recommend?
7  Using Arduino / LEDs and Multiplexing / Re: Cheap LED Matrix on: January 06, 2013, 04:19:37 pm
Will the MAX7219 work with this matrix I found on ebay?
http://www.ebay.com/itm/150961254444?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

The only reason I would ask is that the chip says common cathode and the matrix says common anode. My strong point is programming not circuits.
8  Using Arduino / LEDs and Multiplexing / Re: Cheap LED Matrix on: January 06, 2013, 01:31:34 pm
How about the MAX7219?

This is a perfect price. I like the led matrixs mentioned earlier but could anyone point me to cheaper ones?
9  Using Arduino / LEDs and Multiplexing / Re: Cheap LED Matrix on: January 06, 2013, 08:06:39 am

Is there anything cheaper? Maybe it could only control one display would be ok. I cant really imagine spending $25 on a chip that ill probably solder wrong and it does not really look like it would go in a breadboard.
10  Using Arduino / LEDs and Multiplexing / Re: Cheap LED Matrix on: January 05, 2013, 07:12:24 pm

This would be great, perfect size and reasonable price. My only question is how many pins would I need to control this matrix and could I use some kind of a chip to decrease the pins needed without much work.
11  Using Arduino / LEDs and Multiplexing / Cheap LED Matrix on: January 05, 2013, 11:58:12 am
I am new to the forum and I want to make a clock with and arduino and an led matrix. I wanted to make the following and change the code:
http://makeprojects.com/Project/PS-2-You+LED+Sign/1069/1#.UOhbMG8bSSo
but it seems that Sure Electronics dosent sell the led matrix anymore. I looked at adafruit.com and came across the following:
https://www.adafruit.com/products/872
but it is more expensive and it is small for a wall clock. Can anyone assist me in what I need or where I can get one of these cheaply.
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