Maximum number of USB devices supported

Question

Assuming I can solve for power (externally powered hubs) is there any maximum number of supported USB devices that the pi can handle?

Large(ish) hubs 7-8 ports are relatively cheap and I am wondering if there is anything built in that would prevent me from using a relatively large number of USB devices with a single RasPi (think 10 or more.)

score 9 · Accepted Answer · edited Dec 10 '13 at 08:28

9

The maximum is 127 devices - including the hubs themselves.
Some hubs will actually have two USB hubs internally, so you would need to take that into account also.
Though I can't imagine you hooking up so many devices for that to be an issue.

edited Dec 10 '13 at 08:28

Linus Kleen

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answered Dec 10 '13 at 05:03

Lawrence

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score 6 · Answer 2 · edited Aug 08 '16 at 18:15

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The conculsion of the test described on http://www.yoctopuce.com/EN/article/how-many-usb-devices-can-you-connect is that Raspberry Pi 2 appears to work with 10 devices sending messages at 100 Hz and it is impossible to get 17 devices to work simultaneously, even when they send almost no data.

edited Aug 08 '16 at 18:15

goldilocks

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answered Aug 08 '16 at 17:49

Sven

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Maximum number of USB devices supported

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