Disbursed
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Two Raspberry Pi, one monitor

Fri Mar 27, 2020 12:06 am

Can you set up two Raspberry Pi with one monitor, maybe with a switch?

I'm thinking about getting a second RPi and I'd really like to free up the 17" monitor I'm now using with the first Pi. So, if I get a second Pi and one new monitor, can I run both Pi off the same new monitor without having to power anything down to switch from one Pi to the other? Is what I want a KVM switch?

trejan
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Re: Two Raspberry Pi, one monitor

Fri Mar 27, 2020 12:15 am

Buy a HDMI switch.

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HawaiianPi
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Re: Two Raspberry Pi, one monitor

Fri Mar 27, 2020 12:35 am

Do both of them require a monitor? You could run one headless.
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Disbursed
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Re: Two Raspberry Pi, one monitor

Fri Mar 27, 2020 1:27 am

trejan wrote:
Fri Mar 27, 2020 12:15 am
Buy a HDMI switch.
Makes sense.
HawaiianPi wrote: Do both of them require a monitor? You could run one headless.
The computers don't require it but at my stage I require monitors.

W. H. Heydt
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Re: Two Raspberry Pi, one monitor

Fri Mar 27, 2020 1:49 am

Depends on what else you may want to share between the two Pis. For *just* the monitor, an HDMI switch would be fine. If you need to share the keyboard and mouse, then get a KVM switch. I have two KVM switches by my desk (one cascaded from the other) to handle quite a bit more than 2 Pis. The smaller one has, at the moment, 4 Pis (3 Pi4B4/120GB SSD, 1 Pi3B+/WD PiDrive) attached to it.

If you go the KVM route, just be sure to get one that will handle either DVI-D or HDMI for video and USB for the keyboard and mouse. My 4-port HDMI/USB switch is a "MiniView HD KVMP Switch".

klricks
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Re: Two Raspberry Pi, one monitor

Fri Mar 27, 2020 2:37 am

Disbursed wrote:
Fri Mar 27, 2020 12:06 am
Can you set up two Raspberry Pi with one monitor, maybe with a switch?

I'm thinking about getting a second RPi and I'd really like to free up the 17" monitor I'm now using with the first Pi. So, if I get a second Pi and one new monitor, can I run both Pi off the same new monitor without having to power anything down to switch from one Pi to the other? Is what I want a KVM switch?
Many newer monitors/TV's have 2 or more HDMI inputs.
Unless specified otherwise my response is based on the latest and fully updated Raspbian Buster w/ Desktop OS.

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rpdom
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Re: Two Raspberry Pi, one monitor

Fri Mar 27, 2020 6:05 am

klricks wrote:
Fri Mar 27, 2020 2:37 am
Many newer monitors/TV's have 2 or more HDMI inputs.
Yes, and some other monitors may have HDMI and DVI-D, so you could plug the second Pi into the DVI with an adaptor or appropriate cable.

LTolledo
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Re: Two Raspberry Pi, one monitor

Fri Mar 27, 2020 1:45 pm

this is what I use...
10in_IPS_monitor.jpg
10in_IPS_monitor.jpg (48.57 KiB) Viewed 79 times

my 'secondary' desktop RPi3B+ is connected to the HDMI port

any RPi4B for testing is connected to the DVI port via this:
HDMItoDVI.jpg
HDMItoDVI.jpg (6.54 KiB) Viewed 79 times

and any other RPi for testing will be connected to the VGA port via this:
HDMItoVGA.jpg
HDMItoVGA.jpg (50.15 KiB) Viewed 79 times

switching between the inputs is done via the monitor's control button
keyboard and mouse are switched via USB type KM switch, which also can switch HDMI signals, but am not using that functionality.

also have a dedicated HDMI switcher... but not using it, as the pre-connected output HDMI cable is "hard to tame"
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