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Old 11-30-2023, 08:52 AM   #1
Xeratul
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How to plug Three Monitors on a Raspberry PI 4 ?

Hello,

How to plug Three Monitors on a Raspberry PI 4 ?

https://upload.wikimedia.org/wikiped...el_B_-_Top.jpg

Kind regards
 
Old 11-30-2023, 09:54 AM   #2
pan64
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do you have a question here? Or why did you post that picture?
https://forums.raspberrypi.com/viewtopic.php?t=243812
 
Old 12-01-2023, 08:26 AM   #3
business_kid
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Quote:
How to plug Three Monitors on a Raspberry PI 4 ?
You don't! It barely drives 1 effectively.
 
Old 12-25-2023, 02:20 AM   #4
Xeratul
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It seems that https://forums.raspberrypi.com/viewtopic.php?t=243812

a small tft would be possible on GPIO, but I havent tried.
 
Old 12-25-2023, 11:00 AM   #5
business_kid
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Quote:
Originally Posted by Xeratul View Post
It seems that https://forums.raspberrypi.com/viewtopic.php?t=243812

a small tft would be possible on GPIO, but I haven't tried.
on GPIO, you'd get enough to drive an 80x25 terminal, but hardly a monitor. With framebuffer, you'd be amazed how much cpu one monitor uses. On RPi OS, you'd do better, but I'm pessimistic.
 
Old 12-30-2023, 11:52 PM   #6
Xeratul
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Originally Posted by business_kid View Post
on GPIO, you'd get enough to drive an 80x25 terminal, but hardly a monitor. With framebuffer, you'd be amazed how much cpu one monitor uses. On RPi OS, you'd do better, but I'm pessimistic.
The problem is that fbcp takes a lot of cpu
/dev/fb0 => /dev/fb1 and it is slow


https://github.com/balena-labs-projects/fbcp
 
Old 12-31-2023, 04:52 AM   #7
business_kid
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Quote:
Originally Posted by Xeratul View Post
The problem is that fbcp takes a lot of cpu
/dev/fb0 => /dev/fb1 and it is slow
Yes I know. but I don't think I'm getting through. Perhaps it's a case of "Reisner's Rule of Conceptual Inertia:"
Code:
If you think big enough, you'll never have to do it.
Last edited by business_kid; 01-01-2024 at 09:18 AM.
 
  


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