Pages: 1 [2] 3 4   Go Down
Author Topic: Arduino Scrolling 56x8 LED matrix  (Read 21977 times)
0 Members and 1 Guest are viewing this topic.
Lincoln, NE
Offline Offline
Full Member
***
Karma: 0
Posts: 105
Having lots of fun with Arduino. Thanks everyone!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
I put resistors in rows, not in cols.
Is that make problem?  

Sharing one resistor among up to 56 leds is probably a bad idea because it would alter the brightness of the leds widely depending on how many of those 56 leds are on when that row is on.


Logged

0
Offline Offline
Newbie
*
Karma: 0
Posts: 22
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Maybe Arduino Scrolling 56x8 LED matrix and  Arduino Rolling Multi 16*16 LED Matrix Brick are twinborn brother at some idea. smiley-wink smiley-wink LOL

Arduino Rolling Multi 16*16 LED Matrix Brick :
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1273337857
Logged

Lincoln, NE
Offline Offline
Full Member
***
Karma: 0
Posts: 105
Having lots of fun with Arduino. Thanks everyone!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
how would I change your code to use matrices who's columns are the anodes, rather than the rows?

Sorry for responding so late.
I may be mistaken, but I believe unlike 74HC595, TPIC6C595 can only drain into ground and cannot supply positive to the anode columns of your matrix.
There's probably a chip similar to TPIC6C595 that would work with your matrix, but I do not know what that is. :-(  
Logged

0
Offline Offline
Newbie
*
Karma: 0
Posts: 7
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Hi I am trying to replicate this just using the 74HC595. i have it working perfectly with one 8x8 module. My issue is I have added additional 8x8 Modules but the i cannot get it to output the the additional modules using this code. It just outputs to the first module over and over. i have changed the Bitmap array to reflect the additional modules but nothing has changed. Can someone help me as i am completely stuck.
Cheers
Chris
Logged

0
Offline Offline
Newbie
*
Karma: 0
Posts: 7
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Right i have managed to get this working (Kind of)... using hari's code I have one slight issue. as each charature crosses from one matrix to the next the first colum seems to stick causing an odd flashing pattern.

Take a look at the following Vid and you will see what i mean.


If anyone has any insight into this I would appreciate it, I am sure it is a code issue but i just cant get to the bottom of it.

Cheers
Chris
Logged

0
Offline Offline
Newbie
*
Karma: 0
Posts: 7
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Thanks everyone I couldnt have got this working without you......

I figured it out in the end it was a wiring fault. I have now complete the Sign.
Logged

0
Offline Offline
Newbie
*
Karma: 0
Posts: 28
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
Quote
how would I change your code to use matrices who's columns are the anodes, rather than the rows?


Sorry for responding so late.
I may be mistaken, but I believe unlike 74HC595, TPIC6C595 can only drain into ground and cannot supply positive to the anode columns of your matrix.
There's probably a chip similar to TPIC6C595 that would work with your matrix, but I do not know what that is.

I use 74HC595 for both row and cols and use CA matrixes.
I invert the bit of the characters. It's works!
Logged


Greenwood, Indiana
Offline Offline
God Member
*****
Karma: 0
Posts: 508
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

The TPIC is the same as the 595 but it has higher current output. The code will be identical. There is another chip HEF4794 which is also a high power output chip but only drives 40ma.

The standard 595 chip will drive 1 LED per output fine but if it needs to drive more you're going to have to boost it's output.
« Last Edit: June 07, 2010, 02:27:52 am by mrmeval » Logged

If it was designed by man it can be repaired by man.

0
Offline Offline
Newbie
*
Karma: 0
Posts: 7
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I have actually managed to get this to work now just with the 595's.
Logged

0
Offline Offline
Jr. Member
**
Karma: 0
Posts: 88
Who doesn't like blinking LEDs
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I'm intrigued, can you post code for that? maybe a quick sketch of how the 595s are hooked up to each other as well?
Logged

0
Offline Offline
Newbie
*
Karma: 0
Posts: 7
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I have connected everything up the same way as hari but I used a 595 with transistors for the negative rows.

You can get the code i used at http://www.malyon.co.uk/chris-s-projects/arduino-led-matrix
Logged

0
Offline Offline
Jr. Member
**
Karma: 1
Posts: 53
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Hello hari,

wanted to say thank you, i borrowed a few lines of your code for my Arduquee project. Have a look:

[media]http://www.youtube.com/watch?v=DMQyje3y1hg[/media]

Had to modify it heavily because we designed our hardware differently and I used a tri-color matrix. I found your code after I already had the boards made and some of my own code written.  

The segments are modular and any length marquee can be built. I plan on making these into kits eventually, as a cheaper alternative to serial backpack boards.
Logged

0
Offline Offline
Newbie
*
Karma: 0
Posts: 4
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Hi everybody at the Arduino forum!

Hari, is your homepage down for good, or are you improving it?

I would interested in the "56x8ScrollingLEDSchematic.jpg" picture as I am doing this same project myself for school project. Need some help with the wiring as I am designing a circuit board for this.

Is there anyway you could send it to my email, if you still have it on your computer?
Logged

Lincoln, NE
Offline Offline
Full Member
***
Karma: 0
Posts: 105
Having lots of fun with Arduino. Thanks everyone!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Oh sorry about that...
I've added the schema to the end of the blog post.
http://g33k.blogspot.com/2010/02/arduino-56x8-scrolling-led-matrix.html

Good luck with your project!  It is a lot of work, but very rewarding.


Logged

0
Offline Offline
Newbie
*
Karma: 0
Posts: 4
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Thanks Hari!

This will be a huge help and I will give credit to you in the written report smiley
Logged

Pages: 1 [2] 3 4   Go Up
Jump to: