8x8 Single Colour LED Matrix Issues

Other Hardware LEDs and Multiplexing
1

I'm attempting to be able to control a single 8x8 red led matirx, being able to display whatever I want on it.

I've looked at a few tutorials and the guide in 'Beginning Arduino' book. I believe I have wired the led matrix correctly, however all that happens is everything lights up for a minute or so, then goes off. This behavior doesn't seem to be affected by code.

I've attached some images to show what I've got so far.
Matrix Wiring.jpg - This is how I've wired up the LED matrix to my 2 595 shift registers. It matches my matrix datasheet for the correct pins.

Breadboard Layout.jpg - This is a drawing of my breadboard layout (much neater and easier to see than my actual one)

Breadboard Layout Photo.jpg - The real prototype.

I expect I'm missing something obvious and any help would be appreciated. Let me know if there is other info I need to provide also.

Breadboard Layout Photo.jpg
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Breadboard Layout.JPG
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Matrix Wiring.JPG
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2

There are two types of 8x8 LED matrices: row anode-column cathode and row cathode-column anode.

Are you certain about which type you have?

3

It is a 1088BS, as is printed on the side. From looking around I believe it to be Row anode column cathode.

http://www.ledtoplite.com/uploadfile/2014/0807/20140807034706449.pdf - Not sure who made it, but this is what I could find.

Thanks

4

e135d06c128d52a8ca328afb5c3a9b74fcfc33bb.jpg
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1d1f0469ba15331d66aa0ceb43f3bf042812fa1e.jpg
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964d90a1c23a150bb67d3dae5bd408c3870ea4f2.jpg
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Seriously, whilst this is an amusing but tedious exercise, if you really want to work with matrix displays, get one of these

or even better, one or two (or three ...) of these

5

PaulBidwell:
It is a 1088BS, as is printed on the side. From looking around I believe it to be Row anode column cathode.

http://www.ledtoplite.com/uploadfile/2014/0807/20140807034706449.pdf - Not sure who made it, but this is what I could find.

Thanks

1088BS led matrix and 74HC595N - LEDs and Multiplexing - Arduino Forum may be helpful

same 1088BS with code that works

If you find that you like working with 8x8 LED matrices, you'll want to switch with the pre-made PCB with MAX7219. Be forewarned that eBay sellers of these pre-made modules will sometimes send the wrong type of 8x8 matrices.

6

Thanks for the advice. Unfortunatly that code didn't make a difference, so I guess something is up with my circuit.

I'll have a look at the MAX7219 chip instead though.

7

On your second ( right ) 74HC595 : Pin 14 Serial DATA input is not connected ( to Arduino or to pin 9 of the firtst ( left ) 74HC595) :o - isn't it ?

8

You do realise this discussion ended just short of four years ago and the OP has not been seen since? :astonished: