Relates to powering USB devices from the Raspberry Pi

learn more… | top users | synonyms

1
vote
2answers
307 views

Raspberry Pi Power Limitations

There are very many, often contradictory, claims about the power requirements and limitations of the Pi. What are the exact requirements?
1
vote
1answer
27 views

How much mA or A does the USB ports on the raspberry pi 3 supply?

I have just ordered a pi 3 and a 5" backpack display with a few other things but I'm either supplying too much power or not enough the display draws 500mA through a micro USB cable I've plugged the ...
0
votes
1answer
32 views

Max USB current on a Pi Zero V1.3

Whats the maximum current I get out of the USB port of the Pi Zero? I'd like to power USB Speakers (5V 3W). Is that possible?
0
votes
1answer
48 views

Can I power a Raspberry Pi 3 with a Smart TV's USB-Port?

We use a Raspberry Pi to display infos on a TV. The content is more or less HTML with some Animations. Currently we use a Pi2 and the power does not seem to be a problem. Recently we came up with the ...
3
votes
1answer
32 views

Switch power banks by temporarily attaching two of them

I'm having a hard time finding out, if it's possible to have two power banks attached to a pi. Is there something like an Y-cable or something? Use case is, that I'm planning on doing a timelapse ...
0
votes
0answers
20 views

Control USB power from Pi

I would like to control USB LED currently pluged into power socket from my Pi. I understand that it is not possible to simply switch ON/OFF given USB port on Pi. So is there some way, I could modify ...
0
votes
1answer
36 views

POE Switch to Power the PI?

Sorry if this a repeated, I couldnt find anything similar. Most threads seems to be modifying the PI or splitting Ethernet. Will this setup work for powering the PI? 1) Juniper EC-2200 POE Switch (...
2
votes
2answers
50 views

Control USB fan via relay

I've just bought a usb fan to cool down my router during the summer as it gets very hot. However, since i don't need to keep it on continuously, i was thinking about a solution to automate its usage ...
3
votes
1answer
42 views

Connecting a Behringer UM2/UMC22 audio interface

I'm looking for a not-so-expensive solution to get sound input into the Pi 3. As I'm a sound artist, this should have reasonable noise levels, and in the particular case I also want to amplify a ...
3
votes
2answers
112 views

How to power ten Raspberry Pi 3's?

Recently the company I work for has tasked me with a project, where we are purchasing 10 Raspberry Pi Model 3's to set them up for a lab within the office. Can anyone suggest a power source for ...
0
votes
1answer
29 views

Method to find raspi's usb current output

I am working on a project and I need to connect 4 mobile phones to raspberry pi (Pi-2). I need to charge phones as well. I know that raspi itself cannot charge 4 phones so I bought some usb hub with ...
1
vote
1answer
106 views

Connecting external Hard Drive to Raspberry Pi 2 [duplicate]

I am trying to connect a 2 Tb external Hard drive (ADATA HD710) to my raspberry pi, but the problem is that when I connect it to one of the USB ports, the raspberry pi stops working. I am not sure if ...
1
vote
2answers
78 views

USB HDD on Raspberry Pi 2 Model B? [duplicate]

I have a Raspberry Pi 2 Model B and a 2,5 inch HDD that I want to connect via USB. The HDD also powers itself over USB. Does the Raspberry Pi 2 Model B provide enough power? Can I safely run the HDD ...
0
votes
0answers
26 views

max_usb_current uneffective?

I found out that my raspberry freezes when having connected Huawei E3131 USB dongle... and the signal is really low. At first I thought that it may be connected to max current from USB... as specs say ...
0
votes
2answers
139 views

Can I power a RPi3 from its USB ports?

https://www.raspberrypi.org/help/faqs/#powerHub indicates that certain USB hubs can "backpower" the the Raspberry Pi by its USB ports. Apart from the fact that it seems to bypass the overvoltage ...
0
votes
2answers
69 views

Increase current output at USB for Raspberry Pi 2

I have a self made Isolation Board which consists of 2 Relay Switches and provides a kind switching function to cut off the power supplied to a Sensor Device on the other side of this Board. The ...
0
votes
1answer
45 views

Blinking PWR when not enough current available?

I'm not sure whether I've seen mention of this here before or not. Anyway, I have a B+ with max_usb_current=1 enabled so I can run an external USB drive off it. There's never been a problem with ...
1
vote
1answer
62 views

Amazon Basics USB Hub, disable Backpower? [closed]

I've got the same issue as this question. My Raspberry Pi 3 will not power up when powered from a powered port on the same Amazon Basics Hub AND plugged into the 'USB In' on the Hub. The linked ...
0
votes
2answers
42 views

Pi power from a PC? [duplicate]

Given the type of USB port that the Raspberry Pi 2's DC input has, is it possible to just plug the Pi into a powered device with USB ports (such as a PC) and power it from that device?. Thought it'd ...
0
votes
3answers
108 views

USB Hub to power 8 Pis

Would this USB hub work to power 8 Pi 3's? If not... What are clean powering options for a cluster of 8?
-1
votes
2answers
41 views

Looking for a simple RaspberryPi keyboard with USB hub to connect mouse to [closed]

I have a RaspberryPi model B with 2 USB ports and I would like to connect 3 devices: Keyboard Mouse USB Flash Disk I would like to do this without using extra USB powered hub. Is there any low-...
1
vote
1answer
77 views

Drawing 0.6A from one usb port on Pi3?

I just got my Raspberry Pi 3 and I am not sure whether or not I can draw 0.6A from ONE USB port (others unused (keyboard and mouse excluded)). Can the RPI handle this? Can I use all slots at once for ...
0
votes
0answers
228 views

What could be causing “over-current change” all the sudden?

This is a Raspberry Pi 2 using a 5V 2 Amp power supply running with a LaCie 2TB USB external drive connected via the USB port. It gets its power from the USB port for the drive. The above has been ...
0
votes
3answers
75 views

Do I have to buy a powered USB hub?

Tomorrow I will buy a RPi 2 B, which I would like to use with an external 2.5 HD (5v 1A) and a single 2A charger (connected to the microUSB port). Will I be able to run both of them by adding ...
1
vote
1answer
52 views

is it possible for the raspberry pi 2 to disable usb interface rx and tx?

I was thinking of a program that would grant access to the raspberry pi usb port if the user was authorized and disable it if not. Most of the links I found are regarding the usb port supply, while it ...
1
vote
1answer
120 views

Is it possible to send keys to a computer via USB? [duplicate]

Is it possible to send keys to a computer connecting the RPi A+ via USB on the computer? Will the RPi have enough power? If yes, how?
2
votes
1answer
70 views

Pi 2 Question about power

I currently own a "WD My Passport Ultra 2 TB", It needs 500 mA to run. I only have a usb adapter that supplies my pi (2 b) with 1A. Would getting a better adapter allow me to power the 2TB drive? If ...
1
vote
2answers
236 views

Keyboard and mouse stops working after connecting usb hard drive

The wireless USB keyboard stops working when I connect a USB hard drive. I also tried to connect a non wireless USB mouse together with the USB disk and the mouse stopped working. I'm running ...
3
votes
1answer
64 views

Using Unpowered USB

Does the Raspberry Pi's USB need the 5V/GND wires in order to work with peripherals that are already connected to the same 5V/GND rails as the Pi? I have an application where a RPi is connected to an ...
1
vote
1answer
88 views

Having two 2.5'' drives makes one turn off the other on plug

Currently I 'm using my RPi 2 with a 1 TB external Toshiba USB drive.Back in the day, I had to set max_usb_current=1 in my /boot/config.txt file, because when I plugged it in it would keep trying to ...
0
votes
2answers
245 views

Can I use a Y-cable or Dual-Power cable to get additional power for a single USB powered hard drive?

I'm planning to attach multiple portable 2.5" hard drives to a Raspberry pi 2 Model B. The problem is, the only power source of such hard drive is the USB port it is connected to. In short: They would ...
1
vote
1answer
51 views

How to measure battery voltage?

I'm using a battery as my power supply. Is there any command or library to check the battery voltage? I want to monitor the battery discharge.
1
vote
1answer
541 views

JDownloader: “Invalid download directory” error

I've just set up JDownloader on my Raspberry Pi 2 and I'm getting an annoying error: Invalid download directory. I have to mention that I've attached a 500GB external hard drive to the raspberry ...
2
votes
0answers
48 views

Pi not recognising 2.5" HDD over powered USB Hub

So after finally setting up OpenElec I decided to also get a powered USB hub. Got this one for cheap from work. The power supply for the HUB outputs read: +5V ⎓1A I connected a 2.5" HDD in a USB 2.0 ...
1
vote
1answer
61 views

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?
0
votes
1answer
134 views

Will either of these two hubs supply enough current?

I am about to setup my Raspberry Pi 2 as a plex server and wish to connect the old HDDs I have knocking around. I want to use a powered hub as I know the Pi itself won't be able to power lots of HDDs....
-1
votes
1answer
185 views

Android tablet as second screen via USB

Also can you charge tablet/phone using the USB ports? is solved as the title
1
vote
2answers
54 views

How to determine the problem in HDD reconnection?

I have setup my raspberry as my media streamer server using minidlna. I have also auto-mounted the HDD using its UUID. It works but I have notice from time to time, the drive gets disconnected and ...
27
votes
7answers
7k views

USB Cables… Why are some of them bad for Raspberry Pi?

Yesterday I bought another Raspberry Pi, and installed Rasplex on it. While using Rasplex, I got this colored square on the top-right corner, indicating that the power supplied to my Raspberry Pi is ...
1
vote
1answer
512 views

Powering Raspberry Pi Zero from a USB Power Bank

I want to purchase a USB Power Bank, one of the tiny portable ones, to power my Pi Zero, I need it to last at least 12 hours, but preferably 15 hours, for a comfortable safety cushion of time. My Pi ...
2
votes
1answer
323 views

Is my raspberry Pi dead

I tried a circuit with raspberry pi to drive a motor, so there was 12 V at the circuit I used it with. I might have wired it in a wrong way for a short while and I immediately shut the power down. At ...
0
votes
1answer
56 views

Do I need a usb hub for self-powered usb drive

I have seen suggestions of using a powered USB hub almost every time someone mentions connecting an external USB hard drive to Pi. However, there are those "desktop" self-powered USB hard drives that ...
1
vote
2answers
74 views

Backup power for pi 2 model b

I'm developing a CCTV system out of a pi 2 modal b and everything is on track using noIR camera and stuff. Since a CCTV should work for few hours without power, I'm in need of a backup power source ...
0
votes
0answers
74 views

Why sensors malfunction using an external power supply?

So i have my raspberry 2 ready to read from a GPIO the outout of a motion sensor from parallax (PIR Sensor Rev B 555-28027)using the usb port from my computer. it works prefectly using the 5V or the 3....
0
votes
2answers
74 views

Raspberry Pi 2 not booting, USB port appears to be dead

Background I bought a Raspberry Pi over a year ago but only just tried to get it working this week but it will not boot. The red light is on and voltage is fine. When I plug in my SD card reader the ...
2
votes
2answers
656 views

RBP 2 Power supply and outputs

So If I have an 2 amp power supply I can use 1.2 amps on all 4 usb ports and 0.8 for the rest right? But if I use an 3 amp power supply can I then use 1.2 for usb and 1.8 for the rest or 2.2 for all 4 ...
3
votes
1answer
73 views

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. ...
0
votes
2answers
287 views

Raspberry pi 2 heats and does not boot (Power LED doesn't glow) after over-current dmesg

I was using my pi as a wifi router using USB wifi adapters and saw "USB over-current messages". I removed the USB devices and over-current messages stopped. however after some time. Pi restarted and ...
0
votes
0answers
13 views

Power Raspberry Pi A+ with computer USB 2.0 port [duplicate]

I'd like to know if it's possible to power a Raspberry Pi A+ using a computer USB 2.0 port, just like a keyboard... I know the Raspberry Pi A+ doesn't use a lot of energy. On my RPI, I'll plug a USB ...
0
votes
1answer
101 views

Can CrystalFontz 634 LCD display work with Raspberry Pi 2?

I am running Raspbian on a Raspberry Pi 2. I have a USB-powered CrystalFontz LCD display model SKD204-634 V2.2 (circa 2004). I originally had this thing installed in 2 5.25" drive bays of a PC, but ...