VMA419 Led display; displaying blocks incorrect

Velleman IO Boards
#1

Hey,
After purchase of the display, installation of software, and connection to arduino uno according to manual.
I have the following problem.

Ex.1 print text (0,0, ‘OXO’, …) Normally the word OXO should appear above the top left.
Unfortunately the machine decides otherwise, see photo 1.

Ex.2 write pixel (0,0, … … normal led far left above
that doesn’t work either, see photo 2.
Error in program ?? Doubtfull as the demo programs have the same effect
Connections ?? 3 x double check
Use separate 5V power supply (a lot of light)

In my humble opinion, the display is made up of 8X (8x8) blocks,
Ex. top left [1] [2] [3] [4]
Bottom left [5] [6] [7] [8]

The display makes
Top left [6] [2] [8] [4]
Bottom lef t [5] [1] [7] [3]
Error in software? Error in display? Mistake by me?

IMG_0738 (Small)

I hope the problem is more or less clear.

Regards,
Jozef

#2

second picture.

IMG_0740 (Small)

Regards,
Jozef

#3

We received similar complaints.
We’re currently investigating this.

#4

Dear Jozef,
A new library is available from our website , DMD419.
Best regards,

#5

Thank you, the new library DMD419 works correctly.
Jozef

#6

Hey,
New problem with DMD419.
The blocks now work correctly.
but when connecting two displays (and adjusting program for 2 displays),
The text to be scrolled runs simultaneously across the two displays,
Does not go from display one to display two.
This works with the previous software DMD with non corrected blocks.

Please answer.
Regards
Jozef.

#7

Hi

How did you connect the second panel?

#8

The OUT first panel to the IN second panel with the supplied cord.

Regards
Jozef

#9

Hi, I have the same problem, connecting two displays (and adjusting program for 2 displays),
The text to be scrolled runs simultaneously across the two displays,
Does not go from display one to display two.
I don’t know if works with the previous software DMD because i bought DMD Feb 2018 and the librarie to arduino it is DMD419, but I tried with another DMD libraries and doesn’t work, doesn’t fo from display one to two, runs in both at the same time.

#10

Hi jef.goedgezelschap Did you have some information more about this issue?

Regards

#11

I have not received a solution sofar.
Regards
Jef

#12

I have a same problem with NodeMCU and DMD419. The pinout is not corrected…

Can you send to me what’s the correct connection please?

THX

#13

Do you solve the two matrix panel problem?

#15

Hi,
We are also looking for a solution here :
Velleman Forum - 3x Velleman VMA419

or even there:
Arduino Forum - VMA419

if you have a solution; I would be happy to know it !

Regards,
Psyk0sushi

#16

No news from Vellemann BE or DE

#17

Hello @jef.goedgezelschap @jcblanco @Kikoigo
The code has been modifided and now works. thanks to PaulRb on the Arduino Forum.

U can find it right at the bottom of the page on:
https://forum.arduino.cc/index.php?topic=680645.0

Thank you for the help @Psyk0sushi !

Kind regards,
VEL101