could you look at my code and explain where I would do that though please

Hey guys...I have a 16 x 8 matrix scrolling and adding on 2 more 8 x 8 matrices to make a 32 x 8 matrix scroll.....however, the I have to physically rotate the matrices...how can you do it in code because its difficult for this to work with how the pinouts get placed.....my code is attached

I jumped the gun, because 5 minutes later, I fixed it and got it working just fine.....this is the working code

Hey guys once again. its hard waiting on parts to arrive and keeping your mind focused on what to do when they arrive as you are working on other projects as well.

Anyways...I'm trying to find soem good code to make 2    8x8 matrices scroll across each other...I can only get one to do so...I'm using the schematic provided by the arduino playground for max7219 / max7221 and my matrices rows and columns are hooked up just fine....

its the code that just isn't working to make one matrix scroll over to the next....I have the 2 max7219s cascaded with the Dout going from the first to Din of the second...The clks are in parallel with each other as well as the Loads...the first Din comes from MOSI on the arduino....

Its just I see all these LEDcontrol codes  where they use the pinouts and claim one max7219  (12, 11, 10, 1)

that works fine using one matrix.....changing 1 to 2   making it (12, 11, 10, 2)  doesn't work for the secondf matrix.. does anyone have good code for just 2 matrices scroling txt

using just 2  max7219s and any arduino board?   (I have the caps in place too for the max7219s by the way....

I know what you're saying....I would much rather deal with those types in your more used comparators, integrators, differentiators, summing.....etc.

I watched the rainbow tears video....neat project, but not exactly what I'm looking for...

Ok damn guys....this isn't a see who pees farther contest...

I'm an Electronics Engineer as well.

I will say my favorite op amp to use is the LM358 but if I'm using one for multiple I/Os, I would use the LM3900.....However since I'm trying to tackle my original question.....using FFT to calculate a good audio analyzer output interfaced by the arduino...I know its possible and using the LM386 (Low power audio Amp) is what I have in mind.....

I hate op amps that need that negative supply i.e.  741 

I just don't want negative gain I know that much so interfacing either amp via its non -inverting input  (Rf / Ri) + 1 = Av (Gain) 

now interfacing its output to the arduino via an analog Input and then interfacing that to maybe some LED drivers (Max7219s) to drive LED matrices......

My bad, a low power audio amp......still has an inverting and non inverting input....just doesn't run off of - V like a 741 does.......same thing if you ask me.....

Does anyone have any good code or schematic using LM386 / LM358 op amps to interface the Arduino Uno or Mega2560 and then to display a nice output on a matrix or matrices for an audio analyzer...I know FFT will need to be calculated....

Sweet! Thanks Pedro. Oh and while I have you ans crossroads, my 8 x 32 is ......75% working......at first I had letters backwards and was looking at the code for the problem, but then I woke up and realized my column pin outs were swapped.....so the matrices are good on correct letters now, its just my code somehow makes all 4 say the same letter from my string as they each scroll.....I want them to scroll across one another......still WIP

I'm sure if you look at Cree on google.....( they are in Raleigh ) as am I, but they are the leading manufacturer for LEDs, it could help you. I had one do so on me too.....big POP sound. A lot of semiconductor elements inside there producing frequency......especially blue LEDs

I have a single 8 x 8 scrolling very nice now......And just a heads up...


with the 8 pins on each side of the matrix I thought pins 1-8 were swapped and pins 9-16 were swapped right...


No.....because I just wired up this single 8 x 8 how I have it in my enclosure.....did the same thing...letters are backwards.....

so I swapped the Column pins ONLY.....Like C0 - C7       C1 - C6           C2 - C5         C3 - C4   

and now its scrolling like a champ.....(just the one matrix I have with my Duemilanove here:)

pic attached


I'm going to try and consolidate more code and get my enclosure working fully...after I swap some column wires too.....

Riva,

I uploaded your ScrollTest4  code....

This is the run in I'm having with my mega2560.....

so for this one I have the Duemilanove running....

but the text is scrolling vertical and the letters are backwards.....

man this is so frustrating..

I'm just using 1  max7219 and 1 matrix right now......


I wire my components up via this site:

http://www.pjrc.com/teensy/td_libs_Matrix.html

My matrices say XH-1088BRW  on them as well......

Crossroads, I just built a single 8 x 8 on a protoboard and used your code in this forum...pretty cool...displays a checker board type matrix lit up that shifts back and fourth...nice..

you're right....but you use the serial monitor quite a bit......and arrays is dusty to me.....trying to get more skills on that

I remember arrays in C++ class but I'm just not a great programmer..still amateur .....

I've attached my latest and somewhat greatest code.....I'm going to build up a protoboard matrix with my Uno...I'm surprised nobody has tried this with the mega 2560 like me....