Power is the ability to supply a device with energy. This question covers how to power the Pi, ways to do it, and the safe ranges of power.

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Why do people use powered usb hubs?

I have the RPi B+. It has four usb ports. At the moment I am powering an Arduino Mega, a small RFID reader and a keyboard. I plan to also power a wifi dongle and an arduino uno. Will this just work? ...
0
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2answers
32 views

Using a Generic Switching Power Supply

I have a generic 5V 10A switching power supply with screw terminals, that looks kind-of like this: Is it safe to use the output from here to drive the Pi by cutting a USB cable and connecting the ...
1
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2answers
31 views

Mult-head micro-usb cable

I am building a raspberry pi cluster. I am looking for a multi-head micro-usb power cable to power them. Does such a beast exist? Or can I make one myself?
0
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2answers
37 views

Is it fine to use an ASUS Memo Pad power supply on a B+ RPi?

I'm about to make my first RPi purchase (a B+) to be specific. I do not want to spend any more than I need to, and hence have looked around to see what power supplies I have that may already work with ...
0
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0answers
24 views

suddenly all gpio PIN are not working

I try to blink a led using c code (via gpio4), today it' no working, I have tried all gpio pins. then I tried to put led between (5 volt pin and ground) led doest turn on, I reversed the led ( same ...
0
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2answers
39 views

Raspberry unbootable after unexpected shutdown

I have a raspberry Pi, Model B. I installed Raspbian on the SD card and I would like to use it as a SVN server. I installed everything I need to work with it, and it works ok. The problem is that ...
0
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0answers
36 views

Powering 3.5 inch LCD screen and RPi with 7.4V Lithium Polymer Battery

I am attempting to create a portable Raspberry Pi. I am wondering how I would go about running the RPi and the LCD screen from the same battery. The screen draws about 6.5V. I have a 5V voltage ...
0
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0answers
20 views

Raspi not 'accepting' JUH340 USB Hub. (Raspbian OS)

Easily, not too many people have asked a question about this model of usb hub. What I'm attempting to use is a J5 CREATE JUH340 USB 3.0 with the RPi, but it is highly unworkable. With most everything ...
0
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1answer
31 views

How to use flash storage as blackout-proof volatile memory?

I plan on using the Raspbian derivative Industrial Perennial Environment or a similar solution to create a blackout-proof headless Raspberry Pi for use with various electronics. Obviously this means ...
1
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2answers
94 views

How long does the RPi last on a battery? [duplicate]

For how long can the Raspberry Pi run when powered from a battery of a given capacity? Of course this will strongly depend on how it is used and what devices are connected, but I am trying to get a ...
0
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0answers
25 views

Raspberry Pi is unstable on a single projector, appears to be HDMI related?

I have a Pi in our elevator suite that is intermittently not booting properly. While I look at the raspberry pi (powered by a TP-LINK POE splitter, we use them extensively for Pis) the red power ...
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0answers
31 views

Does the Raspberry Pi camera module have any power saving modes?

My question is related to this one I just asked But this time, I want to know if I can cut the camera power. A FAQ says it draws 250mA, but I don't always need it to be on, so are there any power ...
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0answers
55 views

how to cut power, especially by sleep mode and disabling peripherals?

I've never used the R. Pi before, but am considering it (model A) for my application. The main attraction is the hardware H.264 encoder, but not the power consumption :( I've read about a few power ...
0
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1answer
39 views

Does backfeeding the pi allow me to draw more current than normal from the other free usb port?

I've designed a PCB that does some I/O and powers the raspberry pi through one of the Pi's usb ports. I want to use the other free USB port for a wifi dongle. Since I'm backfeeding power will the ...
0
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2answers
99 views

Power external hard drive though USB — safe to use USB charger?

I would like to connect an external hard drive to the Raspberry Pi. This hard drive must be powered through USB and comes with a cable that has two ends (to ensure sufficient power). The cable is ...
2
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4answers
70 views

Powering an amp and a Pi from a single 12V lead?

I have a project in mind where I put a Pi into an old radio along a small amp (e.g.), or similar. The only problem is I'd like to only have one power lead to the whole thing. The amp takes a 12V ...
1
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2answers
91 views

Raspberry pi reboots when usb wifi (Edimax EW-7811UN) is plugged without usb extension cable

This is an odd issue that there have been quite a bit of discussion about even on this forum. Possible suggested issues range from insufficient power to bad internal hardware design of the pi. When ...
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0answers
38 views

Issue with hard drives, wifi

I had a set up with a powered external hard drive, and a wifi dongle. It worked fine. One day, the wifi dongle decided to cut out—it would restart every time I inserted it into the Pi, and after the ...
2
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2answers
72 views

How can I increase USB voltage on multiple Pi's?

I'm in a situation where I have to leave something like 10-12 Pi's for more than a week, and I want to connect independent HDDs to each one of them. It seems impossible for me to obtain individual ...
1
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1answer
48 views

Under what conditions is the system clock running?

The Raspberry Pi has no battery powered hardware clock, so it needs to fetch time via NTP and store it via fake-hwclock to not start at 1970 again after a power-loss. When the device is running the ...
0
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1answer
92 views

Disable HDMI Interface to achieve a lower power footprint

Is it possible, to turn off the HDMI video component? My Pi operates headless so there ist no need for me to have a video out component. If yes, how much power will be saved?
0
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1answer
59 views

Are there USB powered speakers with an Analog port?

I have built a raspberry Pi Jukebox, specially modified for a handicapped user (voice feedback on all songs, large buttons) but I have one.... last.... problem. The speakers I used ran off the analog ...
0
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1answer
118 views

Use GPIO to turn on external hard drive ONLY when needed

I have a Pi that is set-up with miniDlna for playing media to my tv and a samba server for a NAS set-up. My pi is connected to an external hard-drive that is actually just a hard drive enclosure; it ...
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1answer
41 views

Voltage controlled current amplifier [closed]

How to amplify current 1A, 5V from the 5mA, 5V??. More Particularly, In input side, i have 10mA and 5V and output side required 1A, 5V. Thanks.
0
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1answer
43 views

I want to switch power for a led strip

I'm making an on call sign that can be activated via a web page. I'm not sure if this is even necessary. but i was thinking about using a relay or some other device to power up the strip when in use ...
2
votes
1answer
61 views

Problems with the keyboarddddddd

I have recently gotten my raspberry pi and I have plugged in my wireless keyboard but am having difficulties typing. Just trying to log in, I get piiiiiiiiiiiiiiiiiiiiiiii when I just type pi. So I ...
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0answers
108 views

Multiple PIR Sensors

In my project I am using multiple PIR Sensors. I am providing power using the 5v pin number 2 and also using 3 Signal Pins for receiving. I noticed that if all three sensors are plugged in, then the ...
2
votes
1answer
75 views

Felt current on my Pi, could this have damaged it?

Here is what happened. I have a Belkin Surge Protector. I have connected my iPhone charger (5v 1A) to this and it powers my Pi. I have also connected powered USB hub, transcend hub3k to this surge ...
2
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4answers
73 views

Will my Pi will be fine if I use those el cheapo chinese power adapters? [duplicate]

Title says all. does these cheap power adapters can harm my Pi anyway? and also, lets say these things stop providing less than what required (less than 5v and less than 0.7A), what will happen to my ...
5
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2answers
158 views

Is there any point to a 2.0A (or greater) power supply, given the 1.1A polyfuse?

My question: it's my understanding, based on the official Raspberry Pi FAQ, the wiki, and numerous forum threads on Stackexchange and elsewhere, that the Raspberry Pi has a 1.1A polyfuse on the ...
2
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0answers
178 views

Replace or “Enhance” the 1.1A (700mA) polyfuse F3 with a 2A polyfuse?

I'd like to drive a high powered WiFi adapter, and I'd like to maintain the voltage safety mechanism and continue to power it all from the micro-USB so that I don't have to make unsightly ...
0
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2answers
139 views

Safest way to power a hungry Wifi adapter and the Pi from a single 5V source

My Pi is destined for the skies, so it will receive power at roundabout 5.3V via the BEC (battery eliminator circuit) which will be capable of delivering up to 10A (heavy duty BEC it is), so sourcing ...
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1answer
81 views

Used-to-be-working Pi does not boot, shows no lights, gets pretty hot

I have a Pi running a super-stock Raspian installed with NOOBS (If I remember correctly). Yesterday, it was working fine. I stopped using it for a bit to debug some other parts of the project this Pi ...
1
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1answer
53 views

RPi running too many accessories

I am new to the PI. I am building a pi that will have cameras, sensors and all sorts connected to it. I am wondering even if I use an over powered power supply at 5.3v will it really be enough to ...
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2answers
126 views

What GPIO pins are required to Power RPi? [duplicate]

We are using Raspberry Pi Model B: We used USB connector from PC - confirmed output - 5V, with 2 leads: Connected +5V to Pin 2 Connected GND to Pin 6 on connector - Inserted Ethernet cable ...
0
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1answer
56 views

Powering multiple full-size bulbs

I'm working on a Pi project where I will need to have 4 lightbulb turn off and on based on schedule. The programming aspect is no problem but I'm guessing the GPIO pins are not powerful enough to do ...
0
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2answers
56 views

Battery packs without “blip”

The Battery pack I am using for the has just one problem... plug in the pack to charge the pack itself, and it blips, rebooting the pi (not the mention shutting down most ungracefully.) Are there any ...
1
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1answer
38 views

Make Pi poweroff secure?

I made a little device that solves a specific task. It gets turned on and off by powering it up and down. Now I had a corrupted file system for the first time. That's why I'm thinking about a strategy ...
2
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2answers
170 views

Power the Raspberry Pi via the 5v Pin

I tried to power my Raspberry Pi via the GPIO header, but it didn't work. I powered it with exactly 5v, but it won't boot, but the Status LED "ACT" is on. It's darker then normal, but it's on. I think ...
1
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3answers
144 views

Control 18 LEDs individually? (17 GPIO pins)

Note: I have read Controlling many LEDs with few GPIO pins, but I can't buy additional parts (Degree project) The end result is to make a noughts and crosses grid with 2 LEDs per grid cell. This ...
1
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1answer
120 views

Restart after power Failure with FSCK?

Is there any way to have a Raspberry automatically after a power failure? This is a great feature on Mac OS X that I would like to have on my Pi because of it's usage. It would also be great if I ...
7
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6answers
3k views

Raspberry Pi as power switch

Can I use the Raspberry Pi's GPIO pins to make the Rasperry Pi act as a switch? I would like to shut down, boot up and reboot my computer via hardware remotely. My idea was to take the PS_ON# pin ...
2
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0answers
313 views

How to know if Raspi is bricked

I have a Model B Raspi and - shame on me - overpowered it with about 9V. And to make it worse I powered it using the test points TP1 and TP2, avoiding the polyfuse. ...
1
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2answers
1k views

Raspberry pi not booting!

help me guys, im really desperate :( my RPi out of sudden stopped booting whenever i plug in the power cable it only turns on the red led! nothing more than that.. i've checked this site to ...
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0answers
43 views

power an HDD without backpowering the PI or a powered USB hub [duplicate]

I have a raspberry pi being powered by a cellphone charger (1A) I try to connect and HDD but the power is not enough. I don´t have a powered USB hub BUT i do have other power supplies. So I tried ...
0
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2answers
44 views

how to know how much battery power in remaining?

i got 2600 mAh powerbank for Pi and it manages to stay for some time for my use..But i want to avoid wrong shutdowns due to power failures so .. Which will be the best way to avoid power failure ...
2
votes
1answer
606 views

USB stick gets very hot

I have a 32GB, USB 2.0 ICIDU USB stick that I want to connect to my Raspi for storing ownCloud files. The stick is FAT32 formatted, from factory. My Raspi is running ownCloud 6 using this image: ...
0
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2answers
85 views

How to keep the the mini USB power secure?

I'm a total newbie here so please be gentle. I'm thinking of using a Raspberry PI and a USB drive to make a NAS, but I'm worried about the way the PI gets its power. It looks like the power plug ...
2
votes
2answers
309 views

Any ideas on how to increase the range of an IR transmitter?

I just started using the raspberry pi and I intend like many others to use it for home automation. After hours of trying to capture the input of the AC remote with irremote and actually using raw data ...
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0answers
64 views

Boot using correct display setup

I have my pi plugged into a power strip with my TV. The pi starts up ~10secs before the TV. As a result, I put hdmi_force_hotplug=1 into config.txt. Now, if I power up my pi normally by switching on ...