Search found 98 matches

by Brissieboy
Sat Apr 21, 2018 3:19 am
Forum: Dot Matrix Display
Topic: Help with scrolling Text
Replies: 19
Views: 7004

Re: Help with scrolling Text

gebbypradana, I know the DMD library is limited by use of a byte variable for the displayed string length so it will not be able to handle your long text without modification. It is not unsigned so the limit will probably be 127. I am not sure about the DMD2 library as I have not delved very deeply ...
by Brissieboy
Sun Mar 25, 2018 5:19 am
Forum: Dot Matrix Display
Topic: RGB DISPLAY
Replies: 3
Views: 358

Re: RGB DISPLAY

Someone has actually done this.
You could check out this library
and there are lots of details here.
by Brissieboy
Sun Mar 25, 2018 4:02 am
Forum: Dot Matrix Display
Topic: RGB DISPLAY
Replies: 3
Views: 358

Re: RGB DISPLAY

plito,
As it stands, the DMD library only handles a single colour. There is no provision for multiple colours, and also no provision to control an individual leds brightness which would be required for a full colour display.
And I doubt it would even be achievable with an Arduino.
by Brissieboy
Sun Mar 25, 2018 3:46 am
Forum: Dot Matrix Display
Topic: adding more characters to a limited character font library for DMD display
Replies: 1
Views: 188

Re: adding more characters to a limited character font library for DMD display

Have a read of this thread. There is a lot of the information you need in there.
by Brissieboy
Fri Sep 08, 2017 10:26 am
Forum: Random Chit-Chat
Topic: Death of our forum?
Replies: 2
Views: 876

Death of our forum?

Is our once great forum on its way out? Is Freetronics in difficulties? From a quick look, only 1 of the 7 listed admin team members has been active in the last few months, with most inactive for over 12 months. This may account for the complete lack of control of the spam. More and more spam - fewe...
by Brissieboy
Mon Feb 27, 2017 12:04 am
Forum: Dot Matrix Display
Topic: dmd daisi chaining
Replies: 7
Views: 1537

Re: dmd daisi chaining

cobble, There is a lot of information on these subjects on this forum. Try starting here for some DMD basics, but have a good look around. There is a practical limit on how many DMDs you can drive with a single Uno - and it is a lot less than 8!! Also depends on what else you want you CPU to do. Bet...
by Brissieboy
Sun Feb 26, 2017 11:39 pm
Forum: Dot Matrix Display
Topic: How Scroll Down in DMD
Replies: 1
Views: 856

Re: How Scroll Down in DMD

ir.vean,
Have a look at dmd.stepMarquee(x,y). The 'x' & 'y' arguments control the scroll direction. Try using dmd.stepMarquee(0,-1).
by Brissieboy
Thu Sep 01, 2016 10:45 am
Forum: Dot Matrix Display
Topic: dmd connector board
Replies: 5
Views: 2542

Re: dmd connector board

G'day Stryker, That resistor is only useful when the OE line is not active (driven either high or low). The only time this would normally occur is during powerup or a reset when the DMD has power applied but the Arduino has not yet had time to set the appropriate pin to an output. The Arduino pins s...
by Brissieboy
Tue Aug 30, 2016 5:29 am
Forum: Dot Matrix Display
Topic: dmd connector board
Replies: 5
Views: 2542

Re: dmd connector board

You don't really need the DMDCON board. It does provide a convenient way to interconnect the cable supplied with a DMD to a Uno, but it does nothing other than provide those connections. You can simply cable the DMD to the Uno directly without using the board. The latest version of the DMDCON also i...
by Brissieboy
Thu Aug 11, 2016 5:02 am
Forum: Dot Matrix Display
Topic: Extra Lines of LEDs when displaying numbers
Replies: 2
Views: 1082

Re: Extra Lines of LEDs when displaying numbers

Because you only clear the screen in 'Case 0:' in your switch statement in drawSecond(). You are left with a bit of whatever was there before in the other cases.