Problem with wireless dmx card

[tapitapi]

Hello,
I'm testing a raspberry pi 400 with qlc+.
I have build my own dmx usb inreface like this :
https://diyprojects.tech/2013/05/diy-us ... -under-10/

When I connect my lights with a xlr cable between the usb/dmx interface, QLC works great !

BUT, I want to use this system on a wireless way.
I used this :
https://fr.aliexpress.com/item/10050026 ... 33063113_5

When I connect My dmx/usb interface and the wireless system on a PC with qlc, it works great. With a stairville led foot 8, it works too.
When I use this system with the raspberry, the wireless system doesn't receive the dmx signal form the usb/dmx interface.

Is someone could explain me what is the problem ? Maybe Frequency of the output signal ? In this casen I don't know how to fix it.

Thanks for your help

And thanks for this great project !!!!

[GGGss]

Damien, Welcome to the forum.

Since your usb -> DMX interface get its timing from the processor, it might well be that the raspi is too slow or gets out of breath.
2 things you can do:
a) lower the frequency all together
b) limit the number of channels which are transmitted

Both options you can find on the in- / output tab in the configuration page of the interface.

On your USB interface, do you see the green led flashing when connected to the Raspi?

[tapitapi]

Thanks,
I'm not new on the forum but I have lost my login.... ;-(

So, don't kow how to low the frequency, on the raspberry, I don't see option for that, on the web interface.

I can limit the number of channels. I will test that.

But, the usb/dmx interface works great when I connect a cable between the interface and the light. The led is green.

I have a doubt about The capacity of the raspberry. It's clear, There's no communication between the output of the dmx of the interface and the wireless receiver. It's weird ! Like the dmx protocol was not exactly the same on windows and raspberry.....

[tapitapi]

I have tested with just 14 channels. the transmitter wireless card doesn't receive any signal......

[GGGss]

I don't see option for that, on the web interface.

Now you have to attach a screen to your raspi to make this change possible.

I have tested with just 14 channels. the transmitter wireless card doesn't receive any signal......

So no wireless signal all together?
raspi -> dmx interface -> cable = ok
raspi -> dmx interface -> wireless = not ok
PC -> dmx interface -> wireless = ok ??

[tapitapi]

I have connected a screen, it's the same interface as windows but I don't see where I could change the frequency. Actually, it's 30mhz.

For thé second part you resume perfectly my problème..... Weird ?!?

Thanks

[tapitapi]

I have tested with a screen, it's the same interface as windows, great ! But I don't see how is possible to change the frequency. Actually, it's 30mhz.

For the second part, you have resume perfectly the situation !!!

Thanks a lot !

[GGGss]

Actually, it's 30mhz.

Ow boy ... where do you think this reading is coming from?
Max DMX bus frequency is 44 Hz

You can change the DMX bus frequency in the in-/output tab, select the line of your interface and then press 'configuration' symbol.

[tapitapi]

hello,
sorry, I was occupied last weeks. I tested channging the dmx bus frequency, one by one between 1 and 60 Hz. The wireless card doesn't detect signal. It's steal the same problem.

[GGGss]

OK - go step by step here ...
A) Where do you see 30MHz?
B) Can you select 60Hz refresh rate in QLC+? That would be a bug ... DMX-norm states a max of 44Hz.
C) When changing frequency, do you at least switch between Operate and Design mode?
I am very sure that the problem is not QLC+ but your board?

[tapitapi]

Hello,
I have tested with lot of frequency and I give up ! Now I use to use artnetnode-v2 in esp8266 instead. Thanks for your help !