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31  Using Arduino / LEDs and Multiplexing / Re: Solderless LED Matrix? on: November 08, 2012, 12:30:04 pm
I'm patient though...I can wait a few weeks because I have LED flex strips as well coming....another Nano coming as well......lots of projects.....

I'm going to shorten another enclosure down to just two matrices and make sure I get it scrolling how I would like too....

I have 1 max7219 left...10 on the way....

I'm looking into maybe getting some larger matrices too, maybe some RGB's
32  Using Arduino / LEDs and Multiplexing / Re: Solderless LED Matrix? on: November 08, 2012, 10:02:12 am

Quote

That is a ridiculous price for the MAX7219. Well, the normal price is the ridiculous one...but $1.25 is unheard of. Somehow I think that can't last long.


FYI, I bought some from Ebay...10 for 4.99 $  2 weeks waiting time but oh well

http://www.ebay.com/itm/130733916831?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
33  Using Arduino / LEDs and Multiplexing / Re: Solderless LED Matrix? on: November 08, 2012, 09:59:39 am
Pedro,

I love your 8 x 8...

could you attach your code for that please.....that was pretty cool
34  Using Arduino / LEDs and Multiplexing / Re: Scrolling text on LED matrices using SPI and arduino Mega2560 on: November 08, 2012, 09:51:58 am
My bad..I posted the video and not the shield.....the video obviously was before the shield...

theres a pic attached of the shield now...
35  Using Arduino / LEDs and Multiplexing / Re: Scrolling text on LED matrices using SPI and arduino Mega2560 on: November 08, 2012, 09:48:50 am
latest....not quite working how I would like, but again..........WIP




I had made this sparkfun shield in the past......I want it to do this....



I found how to do that from here:

http://www.arduino.cc/playground/Main/DirectDriveLEDMatrix


but now messing with the max7219s is tricky...
36  Using Arduino / LEDs and Multiplexing / Re: MAX7219 in daisy chain. How many decop capacitors I need? on: November 08, 2012, 09:32:19 am
With the wiring though, I triple checked the datasheet for the matrix and the max7219 outputs.....they were good.....

Here is a video I took of it last night....the matrices working are 2 minutes in.....you'll see what I'm talking about with each matrix displaying the same letter and not scrolling across each other...


37  Using Arduino / LEDs and Multiplexing / Re: MAX7219 in daisy chain. How many decop capacitors I need? on: November 07, 2012, 08:51:10 pm
I'll def. Try to fix some code tomorrow......ans the wiring is def. Good...I swapped wiring on a matrix earlier and it was all jacked up......in my string right now I have each matrix displaying the same letter as it scrolls and so letters aren't backwards, I had the string "MAXIMUM" because those letters backwards or not its the same. But like I said, all matrices say M and then all say A and so on.
38  Using Arduino / LEDs and Multiplexing / Re: MAX7219 in daisy chain. How many decop capacitors I need? on: November 07, 2012, 12:44:54 pm
i had a garbage LedControl Library...I deleted it and downloaded / extracted the other one...so I think I may be in business now....
39  Using Arduino / LEDs and Multiplexing / Re: MAX7219 in daisy chain. How many decop capacitors I need? on: November 07, 2012, 12:31:10 pm
oooohh  PCB in Eagle is Tough...we're trying to make a board on a board machine and I hate the traces in the rats nest...


does anyone have an idea about why the scroll letters would be backwards?
40  Using Arduino / LEDs and Multiplexing / Re: Scrolling text on LED matrices using SPI and arduino Mega2560 on: November 07, 2012, 11:47:07 am
Ok check out the forum titled "MAX7219 in daisy chain. How many decop capacitors I need" it should be fairly newly updated, and in there is what I did.....I did end up cascading them and its working for the most part but the scrolling isn't going across one matrix to the next, it just scrolls the same letter on each matrix individually...

and the letters are backwards....I tried to swap the wiring on just one matrix to see what that would do and it made it erattic...

41  Using Arduino / LEDs and Multiplexing / Re: MAX7219 in daisy chain. How many decop capacitors I need? on: November 07, 2012, 11:44:31 am
Heres my latest update:


so I have cascaded them now...data out from 1st max7219 -> data in to next one....and so on for 4 of them to control the 32 x 8  (4 matrices..)

Its a tight enclosure...I fixed numerous issues...

I had the Rset on the 2nd max7219 on pin 17 not 18......fixed that..so the 2nd Matrix is ok now.....I was about to replace the chip too, but I saw that right at the end....


heres my code working in the enclosure... (Attached)

the problem with the LedControl Library is 1.0.1 doesn't support it, even when I exclude SPI...so which IDE version do you have?

The only other thing that is bothering me ..well two things actually...


so the matrices don't scroll across each other, they just all show the same letter as each individual matrix scrolls...

AND The letters are Backwards.....and before you think anything there, I already swapped the wires around thinking it was wired in backwards, but that made it worse.....

42  Using Arduino / LEDs and Multiplexing / Re: 8 x 32 display on: November 07, 2012, 09:34:32 am
This is exactly how I have it wired up...

and as you use ss 10 , 9, 8 and 7..

I use  53, 49, 48, and 47  (Because 50 - 52 are the other SPI pins)


I'm just torn between what we have and what this playground site says to do:

http://www.arduino.cc/playground/Main/MAX72XXHardware


its saying the Load and Clk are in parallel but the data (MOSI) needs to be cascaded for the syncing into the next matrix...


43  Using Arduino / LEDs and Multiplexing / Re: MAX7219 in daisy chain. How many decop capacitors I need? on: November 07, 2012, 09:31:32 am
Ya I was starting to doubt myself...I have been reading this page over and over regarding cascading the max7219...

http://www.arduino.cc/playground/Main/MAX72XXHardware

Crossroads has been helping me, but I just can't get it to scroll anything on the matrices....


I think I'm going to switch up the wiring to cascade it like the playground has it...and then try to find some example code..or come up with something....

any example code reference would be great...

Just keep in mind, I'm using a Mega2560..

so SCK = 52

MOSI = 51

SS (LOAD) = 53
44  Using Arduino / LEDs and Multiplexing / Re: Scrolling text on LED matrices using SPI and arduino Mega2560 on: November 07, 2012, 09:22:14 am
ok heres the latest...

I placed all the caps  some 10 uF polarized electrolytic  and some 0.1 uF (104) ceramic caps   on each of the max7219s  Vcc line....

I uploaded the code you fixed up for me.....

before, the matrices would just stay on fully 3 of 4 that is.....

now.....they do go out...I'm sure its due to the register clear you mentioned....

However,

I open the serial monitor with the USB stil plugged into the mega 2560 and type hello...

theres nothing on the matrices....but when I press enter after typing hello, the LCD resets.....

I made sure the layout sequence of the matrices was correct right...and Ohmed for a good 30 minutes that all the paralleling is measuring continuity....


Is there anyway that we can manipulate the code (without changing any wiring) to just have it scroll a string?   ---> no serial monitor...
45  Using Arduino / LEDs and Multiplexing / Re: 8 x 32 display on: November 06, 2012, 11:49:05 pm
Thanks....ill update in the morning
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