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#1 2019-09-06 13:52:10

asdfmonster
Member
Registered: 2019-09-06
Posts: 16

Raspberry Pi 4 two hdmi outputs.

Hello folks,

I would like to use the new Raspberry Pi for nanondlp.

Is it possible to use one HDMI output as "projector" and the other as normal display to show the user interface?

Thank you so much for your help and nice weekend.

~ asdfmonster

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#2 2019-12-20 14:41:27

italianuser
Member
Registered: 2019-11-19
Posts: 12

Re: Raspberry Pi 4 two hdmi outputs.

I am  also interested on this, I added to pi3 a 7" raspberry dislpay, but I also have to use another pi3 for nanodlp. Then in a printer I have 2 raspberry
I am looking for a solution to use those 2 hdmi pi4 ports one for printing shield and one to show the nanodlp web interface
Anyone did it, or working on it??

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#3 2019-12-22 19:12:54

Shahin
Administrator
Registered: 2016-02-17
Posts: 3,541

Re: Raspberry Pi 4 two hdmi outputs.

As I remember somebody on the forum have done it using xserver. Not sure about thread.

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#4 2019-12-23 16:00:14

italianuser
Member
Registered: 2019-11-19
Posts: 12

Re: Raspberry Pi 4 two hdmi outputs.

Thank you, problem solved.
It was possible to do it also with pi3 using lcd bus and hdmi to control touch screen lcd and shutter board
But pi4 is more powerful

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#5 2021-07-16 10:35:20

tok199hz
Member
Registered: 2021-07-15
Posts: 6

Re: Raspberry Pi 4 two hdmi outputs.

italianuser wrote:

Thank you, problem solved.
It was possible to do it also with pi3 using lcd bus and hdmi to control touch screen lcd and shutter board
But pi4 is more powerful

I'm trying to do the same with Raspberry Pi 4 and a projector connected to hdmi1 on Raspberry. How did you manage it?
Thanks!

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#6 2021-07-19 06:48:46

tok199hz
Member
Registered: 2021-07-15
Posts: 6

Re: Raspberry Pi 4 two hdmi outputs.

Update: I'am able to manage the projector in the right way if I connect only it to hdmi0 on raspberry. So I was thinking to use xserver to run a user interface on touchscreen connected on raspberry's hdmi1. If I connect the touchscreen the projector is not working properly, from projector calibration page the only thing I'm just sometimes able to see are boundaries for 1-2 seconds. I tried to enable hdmi_safe=1 and config_hdmi_boost=4 in /boot/config.txt but no changes.
Does anybody have any suggestion please? Thanks!

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