Search found 272 matches
- 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...
- 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?
- 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...
- 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...
- 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'...
- 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
- 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...
- 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
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
- 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
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
- 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.