Questions tagged [power-supply]

The methods for powering the Raspberry Pi (typically via its micro-USB connection.)

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1answer
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Can the keyboard draw too much power and cause damage?

I've been using a small, lightweight keyboard, fearful that one using a higher voltage would damage my Pi. Could I have invested in a better keyboard or did I do the right thing to prevent damage?
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8answers
20k views

Pi not starting up, no light

My Pi is not starting up. None of the lights go on. I've searched online for similar problems but couldn't find anything. HOW IT HAPPENED: I was controlling my Pi with my laptop using PuTTY. Then I ...
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1answer
227 views

What does the power button in the corner/log out in the menu do?

Ok, I'm really starting to like the Raspberry Pi. But then, while I was searching the bar at the bottom, I came across the power button. I checked the menu, and there was the power button, with a '...
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3answers
3k views

How to supply redundant power to a Raspberry Pi from two PC usb ports?

I would like to add a Raspberry Pi to an existing two-node server setup to get an utility / playing / monitoring linux system independent from the two PCs, but I can not actually consume another mains ...
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1answer
3k views

Where to measure the DC voltage in RPi?

I have got a power source for my RPi. The manufacturer claims that the output voltage is exactly 5V. However, I would like to measure whether it is true, and I would like to find out how stable it is ...
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3answers
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Capacitor C6 dislodged

I managed to break the C6 capacitor on Raspberry Pi Model B. Its the 220uF 16V EE6 capacitor. Nobody seems to have such low capacitance, low voltage capacitor (the least I can find is 220uF and 60V). ...
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2answers
2k views

Power USB hub and Raspberry Pi with the same PSU

I am still searching for a solution to conveniently power some external hard drivers. I would like to use only one AC plug as I think it is not very efficient to use two different PSUs. My idea is ...
3
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1answer
176 views

Is the power decoupling inadequate?

I hooked up one of these LCDs and noticed that the backlight flickers a lot when powered by the 5V from the GPIO port. The backlight uses ~100mA and the RPi was using just ~200mA. The flickering is ...
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4answers
6k views

Battery pack for model B RPI, Thoughts?

Thinking of getting the battery pack linked to below for my model b Raspberry pi, i am wondering if anyone knows anything about it and how could it is because for first glance it looks amazing. Thanks ...
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5answers
28k views

Circuit to safely power-down Pi

I want to use my Pi as an XBMC server in the car. The XBMC docs say that you should always use the shutdown command before disconnecting the power. I've been thinking that it should be possible to ...
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3answers
111k 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)?
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2answers
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Networks drops, and freezes

Yesterday I've received my Raspberry Pi, and there are some issues I can't get rid of... After a few minutes (3-4 minutes to be exact) of seemingly error free work session through SSH, the network ...
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4answers
8k 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 ...
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2answers
1k views

Safe to power a raspberry pi from a 50W adapter

I have a power adapter that is rated at 50W (5V, 10A output), and I was wondering if it would be safe to run a single pi from it? I am planning on using it for powering more in the future, but would ...
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1answer
1k 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 ...
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4answers
11k 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 ...
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3answers
289 views

Peripheral power from battery

I'm having trouble powering my pi from 12v 2a battery. I made a circuit using 1117 linear regulator, it's supposed to give 1a current and 5v. Pi powers on normally but any peripherals that I connect ...
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2answers
4k 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 ...
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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
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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 ...
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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,...
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0answers
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Would a Compaq Presario V6000 laptop monitor be just fine for the RPi? [duplicate]

Possible Duplicate: Connect Pi to an old laptop screen My Compaq Presario V6000 laptop just had an HDD failure and I took it apart and salvaged the monitor. I was wondering if I could use the ...
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1answer
489 views

What is the quality of the 5V supply on the GPIO

I measured on the 5V pin to the ground and got stunned over the variance that I saw. First I had a Powered USB hub where my devices where attach and so the Raspberry. I just decided to remove my main ...
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3answers
11k views

Can the USB ports be used to power the Raspberry Pi?

Does the power need to be supplied via the micro USB port or can one of the two normal USB ports be used as well? I intend to use SSH only, so the USB port would not be used in any other way, but I'd ...
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1answer
1k views

Dual Power Supplies (Redundant/Spare/Backup)

I have two separate power feeds presented as either two IEC C13 or two UK 3 Pin sockets (the choice is mine). I would like to connect my Pi to both power feeds so that if one power feed fails, the Pi ...
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3answers
10k views

Maximum amperage on power supply? [duplicate]

Possible Duplicate: Can I feed the device with a current higher than 1A? I've checked the RS and Element14 power supplies: 5V 1A. I've read a few posts here on power supplies and seen people use ...
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5answers
2k views

Strategies to deal with unpredictable power supply

I want to install a Pi in my car and use it to record GPS data. What strategies (in my program) can I follow to minimize problems due to power being interrupted when writing to the SD card? So far I ...
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5answers
2k views

Not getting enough volts - is the problem the power supply or the pi itself?

I've been having trouble getting my Raspberry Pi to work, and I found out that the power supply I was using had only been supplying 4 volts (give or take half a volt). I bought this one from Adafruit, ...
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1answer
1k views

When connecting to ethernet it's shutting down/crashing

A few days ago I connected my Raspberry Pi to my screen and I did some work directly on it (without GUI, thus only command line) and suddenly it crashed / shutdown. The red light is on all the time. ...
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5answers
14k views

Power RPi from same Powered USB hub as its Peripherals?

I am putting together all the bits I need to start playing with my Pi, and one question I have is how to power it using the least cables as possible. Given that I have ordered a small mains powered ...
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1answer
2k views

Powered USB hub powering the Pi through USB sockets (not microusb)

I bought a powered USB hub from Maplin, just something cheap, but the guy assured me that it would work fine. Anyway, plugging it into the raspberry pi (with the microusb power lead out of the rPi) ...
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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 ...
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2answers
11k views

Does the power supply need to be exactly 5 volts?

After searching all over my house, all I could find was an LG "Travel Adapter" with an output of 5.1V == 0.7A. Will the extra tenth of a Volt harm the Raspberry Pi?
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3answers
3k views

Can I use an Amazon Kindle Fire power supply?

So i have a spare Kindle Fire power adapter: it's quoted as 5V @ 1.8A. I haven't tried as I don't really want to risk blowing it up!
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2answers
743 views

Trouble powering pi from batteries

I have an 8-cell NiMH battery pack (10V) connected to a UBEC voltage regulator, so that it provides a constant 5V as the batteries discharge. This is wired to the micro-USB connector that's connected ...
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14answers
147k views

How can one control AC power (220V) with a Raspberry Pi?

I though about using the Raspberry Pi to switch on and off other electrical devices which unnecessary consume power in stand-by mode. In short, I'd like to control an AC socket or multiple sockets. ...
103
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9answers
263k views

How do I supply power through the GPIO?

I have seen some examples of people powering their Raspberry Pis by wiring a DC "barrel plug" style power supply to the 5V and GND GPIO pins. What considerations should be taken when doing something ...
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3answers
2k views

Raspberry Pi power source supply

I read that the current should be at least 700mA. can I use HTC Google Nexus One charger as my Raspberry Pi power source supply ?
103
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11answers
138k views

How do I build a UPS-like - battery backup - system?

As we all know, the Raspberry Pi doesn't really use that much power (5v + 700mA is the spec). I'd like to build a battery backup for power outages in a DIY-ish fashion. I don't need surge protection ...
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2answers
10k 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 ...
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4answers
4k views

What to do about all the wall warts (AC/DC Adaptor bricks)?

While having nice little single-purpose machines is great, I have a proliferation of wall warts now which is becoming untenable. Between a router and an ethernet switch and a HDMI switch and a USB ...
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1answer
749 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 ...
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3answers
5k views

Can I power a USB SSD/HDD?

I read the power supply should have 0.7A and that RPi by itself requires around 0.4A-0.5A. So, what if I want to connect an external USB SSD/HDD? External SSD can require 0.5A (and maybe more), so ...
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3answers
9k 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 ...
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1answer
4k views

What type of micro-USB is used?

From previous experience I've discovered there are quite a few different types of micro-USB connectors. Here are three main ones: I'm pretty sure it's not the middle one; and I think it's the left ...
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10answers
122k views

How do I modify my Raspberry Pi to be powered over PoE?

Is it possible to modify the Pi, so that it can receive it's power via Power over Ethernet (PoE)? I would like to be able to power my unit via the ethernet cable, so that I don't have to worry about ...
6
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2answers
7k 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 ...
13
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6answers
11k views

How can I build a power switch?

I would like to be able to have a simple power switch between the RPi and its USB power, such that I don't have to plug and unplug the device to operate it. Is there a simple switch available that I ...
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4answers
1k views

What are the dangers of connecting the Micro-USB through an adapter straight to the mains?

I have a USB-Mains power adapter for charging up an iPod, which I thought I would use to power my Pi. It looks like this: with USB one side, and Mains the other. I was wondering if there are any ...
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0answers
133 views

Can I leave my Raspberry Pi turned on all the time? [duplicate]

Possible Duplicate: Is it suitable for running continuously, 24/7? I want to maximize the life of my Raspberry Pi, should I try to turn it off when I can or is it ok to just leave it running all ...