Freetronics Forum

Hi Dan I see what you mean now. Is that the only DMD you have? I've had some fail in a different mode to that (rows don't light or the whole row lights) but not in the way that is showing. To rule out hardware being at fault, does it have imperfections like that showing if you load the standard demo...

Sorry I don't see the issue - did you post the right video in that link?

If you're using the original DMD library, in the example code "dmd_demo" you'll find this block of code: dmd.drawMarquee("Scrolling Text",14,(32*DISPLAYS_ACROSS)-1,0); long start=millis(); long timer=start; boolean ret=false; while(!ret){ if ((timer+30) < millis()) { ret=dmd.stepMarquee(-1,0); timer...

ERROR !!!!!!!!!!!!!!!!!!! I've not looked further, but this code generates an error at compile time: 'Brightness' was not declared in this scope c++ is case sensitive. You've defined brightness but then pass Brightness (uppercase B) to the pwm function. Additionally, not sure if you mean to but you...

On an old project we used multiple 12V-5V power supplies for an array of DMD powered from 12V car batteries in parallel. I sourced these PSUs from eBay but can't see a similar listing as I searched just now. They were metal-cased, potted and waterproof. What I do see are these, which look like they'...

No, 5V for these ones

Hi If you're planning to make this semi-permanent and trapping your Eleven in the project the neatest path I think would be to solder your power wires direct to the 5V and GND pads on the underside. You might also be tempted to make up a micro-USB cable that only provides the 5V and GND wires. If it...

Hi,
I've always used a single power supply. For selecting the PSU we use 5A per panel as the rule of thumb and so far that's worked out well.
Cheers, Geoff

Hi Ahmed

Because I've found it unstable with ATmega328 based Arduino above 6, I've kept my designs to 6 or fewer. Others on this forum have stated they've had success with more.

Cheers, Geoff

I see it now. You'd have to work through it with the font file open as well to see what all those offsets and indices add up to.