Questions tagged [usb-power]

Relates to powering USB devices from the Raspberry Pi

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1answer
135 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 ...
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2answers
3k 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. These hard drives are powered each by a single USB cable, which is a problem, because the Pi does not provide ...
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1answer
1k 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.
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1answer
4k 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 ...
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0answers
87 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 ...
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1answer
452 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?
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1answer
278 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....
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1answer
975 views

Android tablet as second screen via USB

Also can you charge tablet/phone using the USB ports? is solved as the title
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2answers
68 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 ...
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8answers
11k 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 ...
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1answer
10k 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 ...
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1answer
1k 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 ...
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1answer
97 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 ...
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2answers
111 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 ...
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2answers
124 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 ...
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2answers
2k 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 ...
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1answer
106 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. ...
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3answers
2k 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 ...
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1answer
404 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 ...
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2answers
437 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 ...
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3answers
969 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 ...
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2answers
291 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 ...
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1answer
193 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 (...
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3answers
6k 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 ...
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3answers
22k 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 ...
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2answers
3k 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 ...
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1answer
297 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 ...
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0answers
74 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 ...
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1answer
206 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 ...
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2answers
14k 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?
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1answer
596 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 ...
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1answer
2k views

External Hard Drive does not show up in devices though it is adequately powered

when running sudo blkid and sudo fdisk -l no usb drive shows. The output from dmesg however makes it appear that the external hard drive has no issues [ 3.409324] usb 1-1.3: new high-speed USB ...
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1answer
697 views

Errors with ZTE modem on Raspbian/RPi2

I'm having serious trouble getting a ZTE Mf180 USB modem to work on a Raspberry Pi 2 with Raspbian, using pppd to connect. Usb_modeswitch is working almost flawlessly (sometimes I have to re-plug the ...
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1answer
248 views

RaspberryPi A+ USB Data Lines shorted

This is kinda weird problem. I used Raspberry Pi A+ for my small projects. I did all the programming using a USB WiFi dongle via SSH. It all went happy and fine until one fine day the dongle stopped ...
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2answers
275 views

Mobile power source for RPi? [duplicate]

I have an RPi B and using a USB hub need to plug into it: A LogiLink Wifi nano USB, and 3 USB NFC readers (3*200mA=600mA) This should roughly add up to less than 3A: Power for: (RPi) + (USB Wifi) ...
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1answer
993 views

Raspberry Pi 2 - HDMI not displaying

Just recently purchased a Raspberry Pi 2 Model B 1GB. I also bought a micro SD card Kingston 16GB Class 10. I loaded up the Noobs software as instructed on: https://www.raspberrypi.org/help/noobs-...
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1answer
254 views

Power over USB vs from Raspberry

If I connect a relay to Raspberry PI (Ground to Ground, VCC to 5v, and switch pin to one GPIO), when I write 1 on that pin, the relay switches on and off. But, if I connect the relay Ground and VCC ...
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1answer
251 views

Powered USB HUB in India - F4U016

Has anyone successfully used the Belkin 4-port F4U016 or the Belkin F4U040SA with the Pi? I need to power a Wifi dongle, keyboard and a pen drive. Any advice?
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2answers
658 views

Is it correct to power the Raspberry Pi this way?

I have an embedded Raspberry Pi in an enclosure, with a micro-USB female socket (see middle picture) for power input. Is it correct to power the Raspberry Pi like this (micro-USB socket VCC to GPIO ...
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3answers
5k views

Pi / Pi 2 using modern 'smart' USB Power Adapters to supply power to the Raspberry?

Once upon a time there was only one way to charge a usb device and that was done at 5V and 500mA max, or so I've been told. 'Modern' USB Power Adapters like the Apple 1Amp, 2Amp and 2.4Amp and many ...
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1answer
425 views

I have just searched for a usb Y cable to power my HDD from another power source but also transfer data to my Raspberry Pi

So here the Y cable I'm thinking of buying it's to connect my Western digital Elements HDD to a different power-source rather than using the Raspberry Pi as an only usb power but also using the other ...
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1answer
1k views

How do I turn off my Raspberry Pi when it's connected to a battery pack?

I currently have my Raspberry Pi set up such that it's connected to this assembled Adafruit PiTFT - 320x240 2.8" TFT+Touchscreen for Raspberry Pi. I am also powering the Raspberry Pi with a USB ...
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1answer
2k views

Can I use a power only USB lead to connect Rpi and HDMIPi?

The HDMIPi assembly was originally designed for Raspberry Pi A, with a short lead supplied to power the RPi from the HDHMI driver board. When an RPi B+ or RPi 2 is used, the supplied lead is not ...
42
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2answers
146k views

Is setting `max_usb_current=1` to give more power to USB devices a bad idea?

I've been searching around for more information on the /boot/config.txt configuration directive max_usb_current, trying to find out exactly what happens when that is set to 1, but it's hard to find ...
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1answer
30k views

How can I connect a kinect to my raspberry pi

The kinect plug looks close to USB but it's not quite the same. How do I get this to plug into my rpi? Do I need to cut the plug type and attach a regular usb plug instead? I've looked for a ...
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1answer
467 views

HDMI to micro usb?

If you got a Micro-USB cable and adapted it to a HDMI cable, then connected it between your Raspberry Pi B+ and your Kindle Fire HD, would it work as a monitor?
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5answers
14k views

Will a Duracell 9V battery power my Raspberry Pi for 24 hours? [duplicate]

Will a Duracell 9V battery power my Raspberry Pi (plus camera module) for 24 hours? I've tried power banks and the 50,000mAh rating seems a bit exaggerated, considering I'm getting just 5/6 hours ...
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0answers
686 views

Ext. HDD I/O Error - suspends, power issues?

My external USB HDD becomes repeatedly inaccessible after a long time of usage/idleness. The same thing happened before with a very old disk and I thought it was just failing. But I do have the same ...
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4answers
2k views

Raspberry PI A+ Power requirements

I want to get a raspberry pi a+. I am trying to figure out how I can power it. I will use it with a USB Bluetooth WiFi Combo Adapter. The power consumption of the combo adapter is less than 1.5W. As ...
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1answer
195 views

Why does plugging a usb 2.0 memory stick into a 2011 raspberry pi running openelec cause it to crash?

I have a 2011 raspberry pi set up and running with openelec (v13.2 "GOTHAM") running on it. When I power up the raspberry pi with a USB 2.0 memory stick connected to it, it causes the screen to flash ...

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