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I want to connect 10 Pi Zeros via Ethernet over USB to get 10 Pictures at the same time. My Host machine is a Raspberry Pi 4 4GB running Ubuntu 21.04.

I got everything running as I want to with 7 Zeros connected. Once i connect the 8th Zero all Zeros are disconnectiong and connecting over and over again plus I cannot use mouse or keyboard anymore.

It seems that the Pi 4 is running out of Memory/ RAM/ something else. Is there a way to give the USB Ports more "Power" so i can connect 10? Increasing the usbfs_memory_mb from the standard "16" to "1028" or even "2056" isn't solving the problem.

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    consider a powered USB hub?
    – Jaromanda X
    Commented Jun 28, 2021 at 11:46
  • is this necessary? i am powering all zeros seperately. but i will give it a try thanks
    – han_tuch
    Commented Jun 28, 2021 at 12:28
  • oh, sorry ... I didn't realise you were powering them separately - I read "Is there a way to give the USB Ports more "Power"" - and I assumed so many wrong things with that one statement
    – Jaromanda X
    Commented Jun 28, 2021 at 12:31
  • ah ok thanks! Next time i'll try to provide a clearer question
    – han_tuch
    Commented Jun 28, 2021 at 14:04
  • The other way to connect is using USB-to-Etherent adapters and using network switch. That should eliminate your USB hub limitations.
    – Qareke
    Commented Jun 28, 2021 at 14:04

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You may want to check out this Instructable: https://www.instructables.com/Multiple-Raspberry-PI-3D-Scanner/

He initially connected 40 Pis together using Ethernet to perform body scanning.

In a update (Step 8) he increased the count up to 90 Pis tied together: 90 Pi Scanning Booth

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