Questions tagged [usb-power]

Relates to powering USB devices from the Raspberry Pi

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12
votes
4answers
36k views

External power for USB HDD

I want to plug my 2.5 USB external hard drive to the Raspberry Pi, however, there is not enough power on the USB ports for it to work. I've had some problems with a cheap USB AC-powered hub from eBay (...
15
votes
5answers
34k views

How can I cut power coming out of the Pi's USB ports?

I have a simple device connected to the Raspberry Pi, a small USB fan. The problem is that the fan does not have a on/off switch so I must unplug the fan every time I want it to stop. My question is: ...
3
votes
1answer
611 views

Can I power two Raspberry Pis from one Powered Hub?

I have this hub: Mod My Pi 4 Port USB Hub, which is recommended for use with the Raspberry. I have two Raspberries but one Hub. My Question is: Can I power both Raspberries at the same time, without ...
85
votes
3answers
159k views

How much energy does the Raspberry Pi consume in a day?

My searching efforts have failed when trying to find this. On average, how much energy does the Raspberry Pi consume in 24 hours (minimal usage vs. max usage in a day and USB vs. Micro-USB powered)?
2
votes
0answers
346 views

Pi - Detecting hdmi out or power interrupted [duplicate]

Does anyone know of a way to script this? The idea being that using raspbmc / hdmi to TV / Tv USB to Pi mini USB (with a battery for buffer)... You could have your Pi running off the tv's usb. When ...
2
votes
1answer
2k views

3G Dongle / USB Device Appears and Disappears

I have a 3G dongle plugged into my Pi. Running lsusb only occasionally shows the device occasionally in the list. When I tail /var/log/messages I see the following: Feb 7 17:09:07 raspberrypi kernel:...
5
votes
4answers
9k views

Powered hubs, backfeeding and safety

I've got my RPi set up as a media centre, running Raspbmc, using a powered hub to run a bunch of peripherals including terabyte external HD and a hacked-together IR remote. All very nice, but it's ...
5
votes
1answer
2k views

Power issues with 2 external hard drives connected

I'm using the B model pi which has two usb ports. I originally had 1 1TB external usb hard drive connected to it and then tried to add another 1TB drive and it seemed like that one would not power ...
4
votes
4answers
13k views

High Power USB Power Hub

I currently have four raspberry pi's connected via ethernet to each other. They are currently powered by four 1A power adapters which works fine. But I was wondering if there are any devices out there ...
14
votes
2answers
5k views

Powering Raspberry Pi and other USB devices through a single USB Hub

I bought a powered 7-port USB Hub, which has 7 downstream ports, 1 up stream port and one power port. My question is can I connect both Raspberry Pi and the USB devices that I want to use with ...
4
votes
2answers
4k views

one power supply for raspberry pi and external HDD

I have my Pi and a USB powered external hard disk. I am looking for a way just to have one plug for the both of them. At the moment my Kindle Charger doesn't have adequate power to power them both. ...
3
votes
3answers
7k views

DIY External Powered USB hub not working

I have put together a DIY External Powered USB Hub by following the instructions. (Instructables, htc-linux) USB hub with 4 ports 5v 2A AC/DC power supply (It varies when tested with multimeter, 5.3 ...
2
votes
5answers
6k views

External Hard Drive w/ Powered Hub will not mount

I recently purchased this USB hub for use with my raspberry pi. However I've been having issues with it and my external hard drive. When I plug the drive in everything appears to be okay. The LED on ...
3
votes
2answers
2k views

RPi rev 2 and USB powered harddrive

I am getting my RasperryPi Rev2 soon, and I plan to use it as a media centre. I have a WesternDigital Elements 1TB USB3 2.5" USB powered external harddrive. I know that a normal USB port outputs 500mA,...
8
votes
2answers
7k views

Problems with External Hard Drive - kernel: journal commit I/O error

I'm having issues keeping a 3TB USB 2.0 External Hard drive (self powered) mounted on my pi. I'm using a 1.0 A wall charger to power the pi. I'm connecting the hard drive to a powered Belkin USB hub ...
5
votes
7answers
10k views

What is the lowest power, most compatible, most compact usb wi-fi adaptor that works out of the box with the Raspberry Pi?

It seems that several people (myself included) are having great difficulty getting different wi-fi adapters to work reliably with the Pi. Some adaptors seem to require excessive amounts of power and a ...
13
votes
1answer
1k views

Alternative to polyfuse mod

I have one usb device that will not work because of the limited usb current. I don't want to add a powered usb hub (saving cost and space) and I don't want to solder on my pi (polyfuse mode). Can I ...
4
votes
1answer
3k views

Raspberry Pi USB hub failure

I'm planning to create a media center with Raspberry Pi. For that I would like to attach a 500 GB USB hard disk drive that I already own. Right now, I'm trying XBian, but I already tried Raspbmc ...
6
votes
2answers
11k views

Raspberry Pi Model B Revision 2, Max USB Output Power

With the rev. 2 of the Raspberry, the USB protective fuses are removed. Does this change increase the max current limitation of 100mA per USB? If not, what does imply the elimination of the fuses? ...
11
votes
1answer
2k views

If I power my Pi from GPIO, can I detect that it's not being powered by USB?

I'd like to create a backup power solution for my Raspberry Pi, and I'd like a notification to come up that the Raspberry Pi is running on this backup power. This notification has to tell me that ...
14
votes
2answers
3k views

Can I provide separate power to USB device?

I have a USB device that requires more power than the RPi can provide. I don't want to use a powered hub. Couldn't I build a simple adapter that passes only the data lines and breaks out Vcc and ...
12
votes
2answers
2k views

How do I get a WiFi dongle to work with the device?

I own a Model B Raspberry Pi and am trying to get my Edimax WiFi dongle to work via the USB port. I am using a 750mA power supply and usually have a keyboard-touchpad combo plugged in too, which has ...
9
votes
2answers
13k views

Will router's USB port supply enough power for the Raspberry Pi?

I'd like to use the Raspberry Pi as a small server. My Linksys WRT610N router has a rear USB port and I'd like to use it to supply power to the Raspi. That way, the Raspi doesn't need to have a ...
11
votes
1answer
798 views

Does a two-port charger at 1.5A provide 750mA from each port?

So, I'm looking to buy this energizer charger: http://www.amazon.com/Energizer-Dual-Universal-Charger-Pc2-wa/dp/B004YZI1VW/ref=cm_cr_pr_product_top The 1 port product has 1A the two port product has ...
16
votes
3answers
10k views

Powering from my PC's USB 3.0 port

The specs for my PC's motherboard don't mention any upper or lower limit for its built-in USB 3.0 ports. What is the minimum current that any (standards compliant) built-in USB 3.0 port should be ...
8
votes
2answers
8k views

Fixing issues with Powered USB Hub

With my PI I'm trying to use the F4U018 Belkin 7 port hub (yes - the one on the problem list). Its one of three I have around, all of which happen to be on the problem list - I don't want to shell out ...
12
votes
2answers
6k views

Why are there delays and input issues when using my wireless keyboard?

I booted up my Raspberry Pi for the first time and I plugged in my USB dongle for my wireless keyboard and mouse. It booted up fine but when I type keys either don't appear on the screen or they ...
69
votes
2answers
103k views

How much power can be provided through USB?

I know that my USB powered Hard Drive doesn't work, but what is the minimum power requirement that the Raspberry Pi can fulfil for devices that connect via USB?

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