Search found 272 matches

by stryker
Tue Jan 29, 2019 8:06 am
Forum: Dot Matrix Display
Topic: Doubled horizontal lines
Replies: 5
Views: 403

Re: Doubled horizontal lines

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...
by stryker
Tue Jan 29, 2019 5:18 am
Forum: Dot Matrix Display
Topic: Doubled horizontal lines
Replies: 5
Views: 403

Re: Doubled horizontal lines

Sorry I don't see the issue - did you post the right video in that link?
by stryker
Sun Oct 28, 2018 11:43 am
Forum: Dot Matrix Display
Topic: DMD scrolling Speed control
Replies: 3
Views: 1143

Re: DMD scrolling Speed control

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...
by stryker
Sun Oct 28, 2018 6:17 am
Forum: Dot Matrix Display
Topic: DMD Brightness control
Replies: 36
Views: 22594

Re: DMD Brightness control

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...
by stryker
Sun Jul 22, 2018 3:26 am
Forum: Dot Matrix Display
Topic: Powering DMD from 12v battery
Replies: 1
Views: 414

Re: Powering DMD from 12v battery

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'...
by stryker
Thu Jul 05, 2018 12:50 pm
Forum: Dot Matrix Display
Topic: Connecting two Displays
Replies: 10
Views: 1485

Re: Connecting two Displays

No, 5V for these ones
by stryker
Mon Jun 18, 2018 6:51 am
Forum: Dot Matrix Display
Topic: Power for 6 displays
Replies: 3
Views: 766

Re: Power for 6 displays

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...
by stryker
Mon Jun 18, 2018 5:13 am
Forum: Dot Matrix Display
Topic: Power for 6 displays
Replies: 3
Views: 766

Re: Power for 6 displays

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
by stryker
Mon Jun 04, 2018 8:48 am
Forum: Dot Matrix Display
Topic: DMD2 4x4 display
Replies: 7
Views: 1318

Re: DMD2 4x4 display

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
by stryker
Fri Feb 16, 2018 1:25 am
Forum: Dot Matrix Display
Topic: Need help undestanding code
Replies: 4
Views: 1187

Re: Need help undestanding code

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.