Search found 275 matches

by stryker
Mon Mar 25, 2019 12:04 pm
Forum: Dot Matrix Display
Topic: External data not reading
Replies: 5
Views: 505

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: 702

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: 584

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: 702

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: 702

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: 1330

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: 24129

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: 533

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: 1770

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: 954

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...