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Raspberry and power usb suply

Posted: Wed Sep 18, 2013 8:54 pm
by wenfi
ih,
i have a power usb problem:
my configuration: raspberry, power supply AC 1A, hd 2,5" external usb self-powered, wi-pi wireless adapter.

i can connect both usb device and start raspberry as usually. but after a couple of hours raspberry became unreachable in ssh and if i power on the monitor it show a black screen. i think it's a power supply problem (wi-pi + usb hd). i read in this forum that can be some solution by means of some mods on cmdline.txt

can you tell me more so i can solve this problem and use both wi-pi and usb hd?

thanks so much in advance.

Re: Raspberry and power usb suply

Posted: Thu Sep 19, 2013 12:37 am
by klricks
The external USB drive must have it's own power supply OR you must use a powered USB HUB. There is no other way to run a USB hard disk on the RPi.
There is nothing in any config files that will fix power issues... perhaps you were confusing the no display symptom?

Re: Raspberry and power usb suply

Posted: Thu Sep 19, 2013 9:43 am
by rurwin
You are almost certainly pulling too much power through the input fuse. Because you are only pulling a bit too much, the fuse takes an hour or two to trigger.

Both of the devices that you have plugged in to the USB are fairly power-hungry, especially the hard-disk. The RaspPi only has 200mA budgeted for both of them, whereas they could each expect to be able to use 500mA.

Re: Raspberry and power usb suply

Posted: Thu Sep 19, 2013 10:53 am
by wenfi
Yes, so i think i need a usb with its power supply.

thanks so much for your support, do you have some special model to tell me about?
did you yet use someone?

thanks

Re: Raspberry and power usb suply

Posted: Thu Sep 19, 2013 11:55 am
by Oakham
http://elinux.org/RPi_Powered_USB_Hubs

'Belkin Hi-Speed USB 2.0 4-Port Hub F5U234 Revision 3 2.6A Power Supply' very stable !

(I us the Brlkin to power the Pi with a "USB Hub to micro-USB Cable", which leaves the other 3 ports for WiFi, Bluetooth and Keyboard RF Sender..)

Re: Raspberry and power usb suply

Posted: Thu Sep 19, 2013 2:04 pm
by AndrewS

Re: Raspberry and power usb suply

Posted: Thu Sep 19, 2013 9:13 pm
by wenfi
what about this?
http://www.amazon.it/dp/B00DYOQKW6


that's ok?

Re: Raspberry and power usb suply

Posted: Tue Oct 01, 2013 3:35 pm
by wenfi
hi,
i buyed this http://www.oxgadgets.com/2013/09/review ... -port.html
but the raspberry still crash randomly if is connected to internet by wi-pi module so wifi connection :(
can you please help me to understand why it happens?

thanks so much,
my best,
Giorgio