Search found 270 matches

by stryker
Sun Oct 28, 2018 11:43 am
Forum: Dot Matrix Display
Topic: DMD scrolling Speed control
Replies: 3
Views: 913

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: 20756

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: 294

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: 1105

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: 567

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: 567

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: 1021

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: 1054

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.
by stryker
Thu Feb 15, 2018 8:58 am
Forum: Dot Matrix Display
Topic: Need help undestanding code
Replies: 4
Views: 1054

Re: Need help undestanding code

Where is this code?
by stryker
Tue Feb 06, 2018 6:44 am
Forum: Dot Matrix Display
Topic: Help with scrolling Text
Replies: 19
Views: 10490

Re: Help with scrolling Text

Hi Roman You've not told us how many DMDs you are using in your display nor the size of your font, but you could get an approximation of the message ending in the middle by moving the left side and width of "box1" in the declaration. eg let's pretend it's just one, it might look something like SoftD...