Raspberry Pi and Plugable Devices

We recently received a Raspberry Pi at the Plugable offices and we have been using it to test how our various devices interact with it. The Raspberry Pi has 2 USB 2.0 Ports, and no USB 3.0 ports, so our testing was focused on USB 2.0 devices and a couple USB 3.0 storage devices.

All of these tests were carried out on a Raspberry Pi Model B using the latest version of Raspbian wheezy. Here’s a video of the full setup, followed by a bunch of detail about our tests:

Hubs

  • Plugable USB 2.0 7 Port Hub with 3A Power Adapter – No Issues
  • Plugable USB 2.0 4 Port Hub with 2.5A Power Adapter – No issues
  • Plugable USB 2.0 10 Port Hub with 2.5A Power Adapter – Causes the Raspberry Pi to reboot upon connection, because it supplements the 2.5A wall power with 500mA from the upstream port. This is too much for the Pi., but just at the moment it is plugged in. If you plug the 10 port hub in when the Pi is powered down, you can boot into the Pi and all will be well. But since there are better options (like the 7 port hub above), we don’t recommend our 10 port hub with the Pi.
  • USB2-2PORT – Causes the Raspberry Pi to reboot upon connection. This is simply because this is an unpowered hub. Only hubs with their own power adapter should be used with the Pi.
  • USB3-HUB7-81x – USB HID devices(Mice, Keyboards) are known not to work with this hub on the Raspberry Pi.
  • USB3-HUB81x4  – USB HID devices(Mice, Keyboards) are known not to work with this hub on the Raspberry Pi.
  • USB2-SWITCH2 – No issues

Other Devices

The common pattern with all devices is you must have one of the powered usb hubs above and connect the device through that. If you don’t, the Pi won’t be able to handle the power draw, and it will drop voltage and reset.

Ethernet:

Storage:

Plugable USB2-Micro-200X USB Microscope:

  • On a Raspberry Pi running Raspbian we have test our Microscope connected through a powered USB hub to work with GTK+ UVC Viewer by using the following terminal commands:

    “sudo apt-get install guvcview”
    “guvcview”

Let us know if there are any other Plugable products you’d like us to test, or if you have any questions at all – we’d be happy to help. Thanks for your support of Plugable products!

Where to Buy

14 comments on “Raspberry Pi and Plugable Devices”

  1. Alan Cairns Reply

    You recommend your 7 Port USB 2.0 Hub for use with the Raspberry Pi but Amazon UK say it is currently unavailable and don’t know if the item will be back in stock. Can you tell me if it will be back in stock or is there another UK supplier.

    Regards

    Alan Cairns

    • Bernie Thompson Bernie Thompson Reply

      Hi Alan – sorry, sales got ahead of us. We’ll have our 4 port suitable for the pi in stock late next week, but the 7 port will be a while after that. If you’d like an email when its back I’m stock, just email support@Plugable.com and we’ll get you on the list. Thanks for asking!

  2. Mike B Reply
    • Bernie Thompson Bernie Thompson Reply

      Hi Mike! I think we’ve also got some email going direct with you, but just for the benefit of others, we don’t recommend this hub with the Pi, even though some customers have reported success.

      The hub we do recommend is our USB 2.0 7 port hub (http://plugable.com/products/usb2-hub-ag7) — we have hundreds of Pi users on that one, running solid.

      I’m not sure why some users have success with our USB 3.0 version, while some don’t. The Pi is very sensitive about hubs (which is why there’s lists of hubs that work with the Pi that are relatively short) — in this case, I’m suspecting it may be the cascaded controllers (our USB 3.0 7 port hub is built with 2 4 port controllers internally because there are no 7 port controllers — whereas with USB 2.0, we’re able to use a single 7 port controller). Also, it may be variation in the power supplies. Our USB 2.0 model’s 3A power supply is more of a premium model.

      Hope that background helps, and let us know in the direct communication if we can do anything to help in terms of refunds or exchanges. Thanks!

    • ivan ivan Reply

      We’ve tested the Pi on the latest Raspbian with our 4-port USB 3.0 Hub and found issues with how it handles USB HID devices(they don’t work). We do not recommend this hub for use with the Raspberry Pi.

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  4. Ignaty Reply

    I just got your USB 2.0 7 port hub for my pi, and there seems to be a problem with it. When I connect everything (that is, a harddrive, the power supply and the pi), the red and a blue light turn on, but the pi can’t access any of the devices. I’ve tested everything on my windows machine, and it worked perfectly, but not with my pi.
    I have the latest version of the soft-float debian. Am I missing a driver or something?

  5. Aaron Reply

    Have you witnessed any issues with Pi rebooting when disconnecting a USB device? I have a seperatly powered modem that only connects to Pi USB with 2 data wires (Green/White). Pi will boot just fine but at any point if I remove the USB device by unplugging it the Pi will restart. Really odd. Using Wvdial and PPP.

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    • Bernie Thompson Bernie Thompson Reply

      Actually, no unusual cables are required. It’s the cable that comes with the hub that connects the Pi to the hub for data connectivity (it’s a male A to mini-b cable), and then the cable back from the hub to the Pi to provide power is a standard USB A to micro-b cable (that come with most Pis). Let us know if you have any questions!

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