Raspberry Pi Stack Exchange
Raspberry Pi Stack Exchange

Questions tagged [usb-power]

Relates to powering USB devices from the Raspberry Pi

See this answer for a detailed discussion on the USB power draw capabilities:

How much power can be provided through USB?

376 questions
19
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5 answers

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: is there any way I can cut the power coming from…
opc0de
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14
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2 answers

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 ground to the device (no connection to RPi) such that…
CPRitter
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4
votes
1 answer

Does a USB hub work with Raspberry Pi Zero?

I have a Raspberry Pi Zero with one mini cable to USB wire which I used to today to connect a USB hub. The items connected to USB are not working. It's a USB wire powered hub. Is it safe to attach it and does it generally work?
user431
4
votes
1 answer

How extremely may I fight the Pi's non-hotplugability?

Some people claim that they have fixed the Pi's USB hotplugging so that power spikes don't hard-reboot the Pi. They have extended the (orange) capacitor next to the USB hub by another one for that. If this works with a 10V 220μF one (w/o breaking…
Al Klimov
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4
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1 answer

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 and the same thing happened. I'm using an 8 GB SD card…
Juan
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4
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2 answers

Can I use a battery bank for raspberry pi?

I am working on a project that requires a pi with a camera and a small pressure sensor board to run for up to 20 hours. I am on a budget and need a UPS for my pi model 1 B+. Any answer will be helpful.
Trex Industries
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4
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4 answers

USB Powerbank for Raspberry Pi 4

Is it yet feasible to use a USB powerbank to power the Raspberry Pi 4B? Are there any that you've successfully tried and could recommend? Can a 2.4A USB-C bank work?
nikodean2
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3
votes
3 answers

How to use usb ports on raspberry pi?

Raspberry Pi B+ has four USB ports. But pi cannot provide enough power required for USB devices like external hard disk. Now, if pi cannot provide power, what's the use of having more USB ports? What am I missing here?
finch
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2
votes
1 answer

iPhone charges when using tethered internet (usb)

I'm using my iPhone to provide tethered internet to my Pi. However I see my iPhone is actually charging while connected. Would anyone considered this bad for the Pi? I never figured there would be enough juice to charge the phone off the Pi's USB. I…
KHibma
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2
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2 answers

How to power a Raspberry Pi 3 for USB HDD for storage

I'm trying to use an external HDD for storage on my Raspberry Pi 3B+. The disk is a 0.55A 320GB Western Digital Blue always plugged in, and added to /etc/fstab with defaults,user options. I've checked the disk twice, it works perfectly. After boot,…
corbin-c
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1 answer

Max current from a single USB port

I am not very good in electronics and I am a bit confused. I've read some articles which say that maximum TOTAL current for the 4 USB ports is 1.2A. But how much can a SINGLE USB port provide?
CuriousGuy
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0 answers

External USB HDD with powered usb hub

Please has somebody some idea how to fix what I described at http://www.raspberrypi.org/forums/viewtopic.php?f=28&t=47218&p=546350#p546350? It worked yesterday and today I attached a Nexus 7 to charge from the hub and from that moment Pi can't spin…
michalzuber
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1
vote
3 answers

Troubles with External Dual USB SSD Drives for NAS Setup

I am attempting to create a Raspberry Pi 4 NAS setup. I purchased two Seagate Ironwolf 125 1TB SSD USB (pdf warning) disks. The trouble that I am having is that the RPI will not always recognize the hard drives. When I first initialize the RPI via…
hooknc
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1 answer

RPi 4B USB port power rails connection

I want to connect two external hard drives to the RPI4B. Since the Pi can not provide sufficient power for both of them, external power source is must. Are the USB power rails shared between all four ports? If yes, is it safe to connect the power…
Yogesh
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1
vote
1 answer

Hard wire power to raspberry pi 3b

I have this adapter (https://global.rakuten.com/en/store/denshi/item/55154/) powering a set of RGB screens that I picked up from adafruit. Essentially I completed their pi/rgb matrix project and want to enclose it into a frame (with easy access of…
chollan
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