Relates to powering USB devices from the Raspberry Pi

learn more… | top users | synonyms

0
votes
0answers
23 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
0answers
20 views

Could this USB car charger from Anker be useful to make work a Raspberry? [closed]

not so much ago I bought a Raspberry Pi 3 and I want to use it inside my car. I saw this car charger from Anker on their website: https://www.anker.com/products/A2221011 and it looks like it would ...
0
votes
2answers
75 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
48 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
39 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
46 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
36 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
88 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
37 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 ...
1
vote
1answer
69 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
100 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
72 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
47 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
88 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
68 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
165 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
61 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
86 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
150 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 ...
0
votes
1answer
43 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
398 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
47 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
53 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
112 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 ...
-1
votes
1answer
163 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
6k 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
354 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
295 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
54 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
69 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
58 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 ...
0
votes
2answers
71 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
519 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
68 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
224 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
12 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
87 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 ...
0
votes
2answers
146 views

Under powered Raspberry Pi B+ [closed]

I don't know for sure if it's the power supply I'm using but I am getting under voltage warning on my Raspberry Pi B+ when overclocked and not overclocked (more frequently when overclocked). I've ...
0
votes
3answers
119 views

Power usb short circuited my raspberry pi

I was using a powered USB hub to power a USB external hard drive because the Pi cannot output enough power to power the HD itself. I plugged the HD into the Pi and it looked like it was working, but ...
1
vote
2answers
130 views

Power Pi from 7A power supply

I would like to buy this 7A power supply to charge my phones, power raspberry pi and externally power (like this) simple USB hub connected to pi. Is this supply suitable for powering pi? Should I ...
1
vote
1answer
58 views

Why it should not be possible to back feed a modern Raspberry Pi? [duplicate]

I read some posts, like this one, saying it this not possible to back feed a RPI from the USB sockets. But I think this is possible. I have two evidences for that: This post from Eben Upton ...
0
votes
0answers
362 views

Several USB camera does not work, but Raspberry camera does

I bought a Raspberry Pi camera (https://www.raspberrypi.org/products/camera-module/) and it works great. My problem is that there's no way to build a good-looking device with that camera. I've seen ...
3
votes
3answers
4k views

Undervoltage rainbow despite good power supply

I have my Raspberry Pi 2 since a week and noticed that little rainbow on the top right corner of the screen. Seems like this is a alert for under voltage. I tried different power supplies and my best ...
1
vote
2answers
351 views

Raspberry Pi USB microphone 1 Khz background noise interference

Using this microphone I have some severe noise in the background. The more peripherals I plug in (camera, gertboard, wi-fi adapter) the worse the noise becomes. We've tried several different power ...
3
votes
1answer
66 views

HDMI broken after VUSB was shorted for approx. 500us

I was setting up a mobile power supply for my Raspberry Pi 2 consisting of: - a 12V Battery - a step down power converter that converts 7-24V to 5V/3A It was working fine until I connected the ...
0
votes
0answers
34 views

Power led is not up when powering from power bank?

Is it normal that red led (power one) is off when Rasberry is connected to power bank instead of original power adapter? Got 23000mah power bank that gives 5.1V/2.1A on USB... checked it out, and it ...
1
vote
1answer
127 views

Will there be backfeed problems if I use a powered external HD on RPi 2?

I've got an old Western Digital ext hd that uses this power supply (http://www.amazon.com/Adapter-Western-Digital-Wdbaau0010hbk-01-Supply/dp/B00FPLZFP4). I was planning on powering RPi 2 just from ...
5
votes
2answers
5k views

How to make a high powered USB hard drive work with the Pi?

I tried directly connecting my WD My Passport Ultra 1TB USB hard drive to the Pi but it draws too much power, and it doesn't even run the OS. Is there any way to connect it without damaging the Pi?
1
vote
1answer
195 views

USB Bluetooth dongle shuts down after Bluetooth serial port disconnection?

I have a USB Bluetooth dongle on my Raspberry Pi. I added an SP (serial port) service to my Pi. Every time, the other device that has been connected to the Pi through the SP service disconnects, the ...