Search found 280 matches

by stryker
Mon May 06, 2019 12:48 pm
Forum: Dot Matrix Display
Topic: Accepting input from Serial monitor to display it on DMD display
Replies: 3
Views: 536

Re: Accepting input from Serial monitor to display it on DMD display

Hi The type of 'string' passed to the DMD drawMarquee() function is actually an array of char, rather than a String (with a capital S) type. You'll see one simple method of printing numbers onto the DMD in the example sketch dmd_clock_readout. To convert the time to text is to take each digit in tur...
by stryker
Wed May 01, 2019 2:21 pm
Forum: Dot Matrix Display
Topic: 16*32 led display with gsm 900Amodule
Replies: 1
Views: 1722

Re: 16*32 led display with gsm 900Amodule

Hi, There's nothing obviously shouting out from your code to me. I suggest you include the Arduino Trace library (it's included in library manager, so easy to install automagically from the IDE) and insert additional debugging messages in the code. https://github.com/bblanchon/ArduinoTrace is the pr...
by stryker
Wed May 01, 2019 4:25 am
Forum: Dot Matrix Display
Topic: Driving 48 panels
Replies: 6
Views: 816

Re: Driving 48 panels

Because our club didn't end up progressing this I've not published the code as it is, nor done a write up other than the posts in this forum. I actually pulled the test board apart about a month ago and threw out most of the custom PCBs etc. In hindsight they'd have been perfect for what you're chas...
by stryker
Tue Apr 30, 2019 8:22 pm
Forum: Dot Matrix Display
Topic: Driving 48 panels
Replies: 6
Views: 816

Re: Driving 48 panels

The "master" or coordinator of this is actually less of a processor intensive task than driving the panels, so another ATmega328 based Uno will well cover that. Canbus is a bit of overkill I think for what you need - I used Serial, with software Serial to have each board controller in a daisy chain,...
by stryker
Tue Apr 30, 2019 12:09 pm
Forum: Dot Matrix Display
Topic: Driving 48 panels
Replies: 6
Views: 816

Re: Driving 48 panels

Hi Tommy That's a really fine challenge. I never did try to scroll with the scoreboard so while I can confirm the master/slave idea tested fine it wasn't for this. Thinking aloud though I expect you could setup each slave with the same string and using some pretty slick timing kick off the marquees ...
by stryker
Mon Mar 25, 2019 12:04 pm
Forum: Dot Matrix Display
Topic: External data not reading
Replies: 5
Views: 1260

Re: External data not reading

It's hard to know without seeing the rest of your code, but why can you presume there are 3 characters to display following the client.read() granted you hard code the length as 3 in the calls to dmd.drawString()? There's nothing I see here that means you're waiting for 3 before displaying them. If ...
by stryker
Tue Mar 05, 2019 10:04 pm
Forum: Dot Matrix Display
Topic: Doubled horizontal lines
Replies: 6
Views: 1433

Re: Doubled horizontal lines

Glad you sorted that out Dan. Do you need a full keyboard? If you only need to enter characters, and a full size keyboard isn't 100% needed I've used an android app on a phone to send characters via bluetooth as a solution to this. MIT App Inventor makes the app creation straightforward (and the rig...
by stryker
Sat Feb 23, 2019 3:48 am
Forum: Dot Matrix Display
Topic: Missing characters from serial input when using DMD2
Replies: 5
Views: 1278

Re: Missing characters from serial input when using DMD2

I had a digital scoreboard which used serial to communicate between controllers, and I did find issues with more panels which was the rationale of breaking it into smaller parts with each section controlled by one board and a master to rule them all. At the time I found 6 was a safe maximum per ATme...
by stryker
Tue Jan 29, 2019 8:06 am
Forum: Dot Matrix Display
Topic: Doubled horizontal lines
Replies: 6
Views: 1433

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: 6
Views: 1433

Re: Doubled horizontal lines

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