Wifi and Keyboard/Mouse without hub


7 posts
by A Future Pilot » Wed Oct 24, 2012 3:52 am
So I was just wondering...if I use a good quality 5V 2A charger will I be able to use both a usb wifi dongle AND a wireless usb keyboard/mouse setup at the same time?
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by Lob0426 » Wed Oct 24, 2012 4:52 am
That depends on your board revision.
Rev 1.0 board, most likely not due to polyfuses. Could be modified to work.
Rev 1.1 probably, no polyfuses
Rev 2.0 board most likely

There is no definite answer. Some WiFi dongles draw a lot of power. The F3 polyfuse is 750ma. it will start choking back the current at around 1A. Most of the Wireless keyboard/mouse setups do not use that much power, usually 100ma or less. Also some RasPi work with a particular setup and others will not work with them.

I used a RasPi version 1.0 (soldered a jumper in place of the polyfuses), a 2.1A iPad charger, Netgear ver111v2 WiFi and a Logitech EX100 Wireless keyboard/mouse. Did not work directly plugged into RasPi, but worked fine through a hub. Changed the WiFi to a Linksys WUSB54GC, work as a direct RasPi plug in. unplugged EX100 combo and used Netgear WiFi with no problems.

You just have to find the right combination of parts!
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by A Future Pilot » Wed Oct 24, 2012 4:02 pm
Thanks for the reply! I'll look around and see if I can find a good combination that'll work :)
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by thsBavR10 » Wed Oct 24, 2012 4:07 pm
The configuration is working for me, with Rev 1 (Fuses F1 /F2 bridged by 1 Ohm resistor) and Rev2 board.
I use logitech K400 and Edimax Wifi.
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by theforsakenone79 » Tue Oct 30, 2012 2:33 pm
thsBavR10 wrote:The configuration is working for me, with Rev 1 (Fuses F1 /F2 bridged by 1 Ohm resistor) and Rev2 board.
I use logitech K400 and Edimax Wifi.


Im running the exact same setup and have been unable to get my Pi to play nice at all using Raspbian. The Pi is a 512MB unit with moutning holes on the board (which Im presuming is a Rev2 board). I can plug either one or the other of the adapters into the USB ports but if I plug in both, I dont get response from either - evident from the keyboard no longer working. Im using an Apple/iPhone AC adapter (5v @ 1.0A). Id like to be able to get this to work without a powered USB hub but will get one if I need to. Any suggestions?
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by bantammenace2012 » Tue Nov 06, 2012 7:08 pm
I have been scratching my head over the Edimax Nano wifi dongle, Logitech K400 keyboard/mouse and the Flirc IR receiver.
The K400 channel is locked.
By changing the channel on my wireless hub to a fixed channel rather than auto it would appear that I have now got the Edimax and the K400 working when plugged directly into the RPi. The K400 is attached to the extender that came with it, distancing it a little bit from the Edimax.
The Edimax found the new channel automatically.
I have a brand new RPi and an old one. Both work fine. You may need to try a few channels.
The RPi is powered from a HTC Desire phone charger.

Changing the channel of your wireless network may not be possible if its not your network.
I have not been brave enough yet to add the powered USB hub that would be needed to add the Flirc, which works well with RaspBMC btw.
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by thsBavR10 » Wed Nov 07, 2012 10:57 pm
theforsakenone79 wrote: ...
Id like to be able to get this to work without a powered USB hub but will get one if I need to. Any suggestions?


Did you check the resistance of F3 or voltage drop via polyfuse F3 (underneath the board, near SD card)?
The resistance should be in the range of 0.2 - 0.3 Ohm, the voltage drop @ 500mA about 0.1 .. 0.15V.

If the resitance and voltage drop is much higher, you should send the Pi back for replacement or replace
the polyfuse (6V, 0.75A or 1.1 A), if you can get one.
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