Search found 51 matches

by Aussie_Wombat
Tue Jun 12, 2012 8:31 am
Forum: Dot Matrix Display
Topic: DMD on a Maximite (Pic32) using MMBasic
Replies: 1
Views: 3512

Re: DMD on a Maximite (Pic32) using MMBasic

Managed to create a new command for the mmbasic source code that reads the 4x4 bytes of video memory and output through spi. Command runs just under 1 ms. update whole display in 4 ms. plenty of time to draw to the vga screen...

No flicker.

Cheers Dennis
by Aussie_Wombat
Tue Jun 12, 2012 5:33 am
Forum: Dot Matrix Display
Topic: DMD - Every 2nd line is not lighting up.
Replies: 4
Views: 4158

Re: DMD - Every 2nd line is not lighting up.

Are you running an external power supply (5V 2A for example) to the dmd? It may be the uno is not supplying enough power to light up the other lines by itself. If you have a low mA powerpack. or as per the dmd.h file #define LIGHT_DMD_ROW_01_05_09_13() { digitalWrite( PIN_DMD_B, LOW ); digitalWrite(...
by Aussie_Wombat
Mon Jun 11, 2012 9:09 am
Forum: Dot Matrix Display
Topic: Inadvertantly connected 3 DMD's to 12v 5A- Fixable?
Replies: 5
Views: 4955

Re: Inadvertantly connected 3 DMD's to 12v 5A- Fixable?

@dtbaker

Nah they both look like this
20120611_165754.jpg
dead dmd
Cheers Dennis
by Aussie_Wombat
Mon Jun 11, 2012 7:38 am
Forum: Dot Matrix Display
Topic: Multiple DMD with single external 5v power supply
Replies: 2
Views: 3242

Re: Multiple DMD with single external 5v power supply

I went to altronics and bought a 5v 4A plugpack to power 3 dmd's. Doesn't get warm yet. still too bright for my camera ....

Cheers Dennis
by Aussie_Wombat
Sat Jun 09, 2012 8:28 am
Forum: Dot Matrix Display
Topic: DMD on a Maximite (Pic32) using MMBasic
Replies: 1
Views: 3512

DMD on a Maximite (Pic32) using MMBasic

I got my DMD (single panel so far) to work on my Maximite , using the supplied MMbasic V3.2. Admittedly it flickers a little as the refresh rate is just on 8-9 ms, but at least it works.. It mirrors the VGA display to the DMD....It just ping pongs the text across the screen..... 8-) My code (2.54 Kb...
by Aussie_Wombat
Mon Jun 04, 2012 8:37 pm
Forum: Dot Matrix Display
Topic: Control DMD text over network
Replies: 6
Views: 6834

Re: Control DMD text over network

I found the 256 character length was using up all the sram. so I changed it all to 128 characters instead. All works ok now... I am powering 3 DMD's using a 5V 5A power pack and it overwhelms my camera on my phone still. I am using your code for a sign in a t-shirt stall at a discount market to disp...
by Aussie_Wombat
Sun Jun 03, 2012 6:11 am
Forum: Dot Matrix Display
Topic: DMD display, only 32 top right LEDS work
Replies: 3
Views: 3860

Re: DMD display, only 32 top right LEDS work

ok

obviously the QC guy was asleep when this one was tested. lmao

Cheers Dennis
by Aussie_Wombat
Sun Jun 03, 2012 6:04 am
Forum: Dot Matrix Display
Topic: Control DMD text over network
Replies: 6
Views: 6834

Re: Control DMD text over network

UDP handles all the special characters as well....

~!@#$%^&*()_+-={}[]:";'<>?,./

Cheers Dennis
by Aussie_Wombat
Sun Jun 03, 2012 5:49 am
Forum: Dot Matrix Display
Topic: DMD and clock skew?
Replies: 7
Views: 6903

Re: DMD and clock skew?

In the DMD.cpp (arduino\libraries\dmd\dmd.cpp) file it sets the spi speed to SPI.setClockDivider(SPI_CLOCK_DIV128); // system clock / 2 = 8MHz SPI CLK to shift registers when opening the DMD class. in the SPI.h (arduino\libraries\SPI\SPI.h) it lists #define SPI_CLOCK_DIV4 0x00 #define SPI_CLOCK_DIV1...
by Aussie_Wombat
Sun Jun 03, 2012 5:17 am
Forum: Dot Matrix Display
Topic: Control DMD text over network
Replies: 6
Views: 6834

Re: Control DMD text over network

I just use the UDP Test tool from SimpleCommTools.com and send the data through the network using UDP. Sample code in the viewtopic.php?f=26&t=661 " Etherten with DMD - Internet text display" post.. OR code from a php page or *.html in the same post...

Cheers Dennis