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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1answer
22 views

Can you back power the RPi2B? [duplicate]

I was wondering if the Raspberry 2 Model B can be back powered. From what I see here it should be possible. But in various other places it's been said that for the B+ it isn't possible and the 2B ...
0
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1answer
44 views

Load limit of Raspberry Pi 2

After connecting Android phone to Pi 2 though USB the red and green light are very low. Does Pi 2 have any energy load limit?
1
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1answer
18 views

Pi2 won't start when connected to breadboard via ribbon cable and gpio-to-breadboard interface

I have a Raspberry Pi 2 that works great until I try connecting a breadboard to it via a 40-pin ribbon cable and GPIO-to-breadboard interface board. Whenever the board is connected to the pi, the pi ...
1
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2answers
67 views

Safest way to switch off uncleanly

Assuming that I do not have keyboard or ssh access to my Pi, but I do have physical access. What is the safest way to power it off and preserve the SD card? (This is the case if I've just done a ...
1
vote
2answers
43 views

Power led randomly blinking every 1 minute on b+

I've just bought my rpi b+. Power supply for raspberry is 4.94V (which is in appropriate 4.75-5.25Vrange). Raspberry pi working good, but there is one possible trouble. I don't know why, but power ...
3
votes
2answers
46 views

USB power cycling problem

I am using a USB 3G stick on a RPI B+ (3.18.7+) to ftp measurements from a sensor platform. To limit RF interference, and save power, I am turning it on and off a lot (which on the B+ is now possible, ...
0
votes
1answer
38 views

XBMC Sleep Mode

I've been looking to get a Pi as an easy way to setup a TV box for my living room. I'd like to set up XBMC and be able to put it to sleep when not in use. I've found the Sleepy Pi addition but I was ...
0
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0answers
10 views

The Power Principle [migrated]

i am trying to build a 5V/2A uninterrupted power supply (UPS) for my rPi B+ using LM7805 and some phone batteries (3.8V/0.5A and 3.7V/2A) or any of the 6 pcs 18650 batteries (3.7V/2A) that i have ...
3
votes
1answer
606 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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3answers
79 views

Raspberry pi power cable is unstable

The slightest bump, or knock to the micro power connection and my pi reboots. Anyone have this have problem? I wouldn't feel secure releasing a product that is so delicate.
1
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1answer
119 views

libCEC not working on LG TV (LD330)

I've just installed libcec on my Raspberry Pi B+ with (raspbian on it), following the instructions from here (https://nyxi.eu/blog/2013/04/15/raspbian-libcec/). I want to be able to turn on/off the ...
0
votes
2answers
54 views

Shutdown RPi by plugging power (SD card mounted read-only)

I setup my RPi to boot from SD card in read-only mode. Is it safe to just unplug the power in order to shutdown? Can any components be damaged? This way I could place a switch in front of my USB ...
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2answers
72 views

Would a powered USB hub for Model B work to power Model B+?

I've read somewhere that there are different power requirements for the Model B+. Question is would a powered USB hub that is currently being used to power the model B be good enough to power the ...
2
votes
5answers
216 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 ...
0
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0answers
17 views

Pi cluster (hypothetical) [duplicate]

I have been poking around on the internet and i have found these new raspberry pi compute modules. Further poking has found that people have made designs to hold 120 of these in a 1u server and then ...
5
votes
4answers
346 views

Will any external battery power a Raspberry Pi?

I am working on a project that needs the Raspberry Pi to work without a mains connection. I have considered buying a 50000mAh USB power bank. Would this power a Raspberry Pi, and if so, would it ...
0
votes
3answers
53 views

Power LED is very dim on RPi B+

if I am plugging in the power supply the red power led lights very dim. I found several guides to test the the board with a multimeter but these were for the other revisions, and it seems like B+ is ...
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votes
1answer
71 views

Current draw for + models (A+ and B+)

Essentially What's the current draw and supply voltage tolerance? but for A+ and B+
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2answers
94 views

Use a servo right from the GPIO without a breakout board

I've been researching how to use a servo on my Raspberry Pi but the tutorials concerning this seem very complicated. This surprised me, since the Raspberry Pi has GPIO built right in. Despite the Pi ...
0
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0answers
44 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 ...
0
votes
4answers
127 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 ...
1
vote
1answer
94 views

Not enough power to the Raspberry Pi B+

I have a problem with my Raspberry Pi B+. First the problem was that I didn't get the keyboard or mouse to work and I have now found out that the Pi do not get enough power. When I looked on forums, ...
0
votes
1answer
70 views

Power on 5V GPIO power pin at boot

I am new to the Raspberry Pi, so I wanted to describe my project along side my question. I have a functioning Raspberry Pi A+ and I am building a heads-up display using a MyVu Crystal. This link ...
0
votes
1answer
31 views

problems running XBMC on 2011 Raspberry Pi

I have a 2011 Raspberry Pi and have been trying to get openelec (v13.2 Gotham) to run on it. I am powering the raspberry pi using a Sony phone charger outputting 5V at 850mA. Whenever I plug in the ...
2
votes
1answer
55 views

Eject ipod from Rpi without disconnecting

This is not a question on how to umount a drive. I have a 2nd gen ipod nano (old) that works great but has 0 battery life. I figure if I plug it into the raspberry, it can power it and it does. ...
3
votes
1answer
50 views

model B goes offline after a few days, power light is dim, V(TP1-TP2)~=2.6, but Voltage across power supply reads 5.12V

I have a pi model B being used to read from a rfid card reader. After a week or so of continuous use, it powers down and the red light goes dim; If I check the voltage across TP1 and TP2, I get ...
3
votes
3answers
241 views

Finding a relay capable of being constantly switched?

I've got a Raspberry Pi and some Christmas lights. I would like to use the Raspberry Pi to control the Christmas lights by switching them on and off with a Python script. The programming aspect of ...
2
votes
2answers
130 views

Switching power source from power bank to mains without interrupt

I'm planning to build a robot similar to one described here. The pi and the controller are going to be powered from powerbank. However, as big fan of live coding I am (there's gonna be some LISP ...
0
votes
1answer
49 views

Measure SoC (Juice left) in battery

I'm powering my raspberry pi with 2 no-break batteries. I want to know if is there any way for me to know how many percent of the battery is left. If is there anyway to measure it would be great so I ...
1
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2answers
252 views

External shutdown (properly) button?

I have a Raspberry Pi that I want to mount in an enclosure. The enclosure already has a couple external buttons on it. I'm trying to find some sort of circuit that I could by that I could wire the ...
1
vote
1answer
66 views

Getting 3 new entries in /dev/ttyUSBx for each 3G dongle connected

I am trying to connect 4 3G dongles to Raspberry Pi B+, I have some troubles making them all reply to AT commands, and I see that each time I connect one dongle, 3 new /dev/ttyUSBx ports are created ...
0
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3answers
375 views

Detect Power Loss in AC outlet

Hy, I want to make my Raspberry Pi to detect AC power outage and send E-mail/SMS accordingly. The Pi I have is model B not the B+. Now I have read other posts but my request is different. The idea ...
0
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1answer
227 views

B vs. B+ power consumption

I've read several comparisons of the Model B vs. B+, and they mention that one of the benefits of the B+ is it has lower power consumption. With the same processor, and most of the same components, ...
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2answers
306 views

Car computer how to connect to car battery and also not drain battery when the car is switched off

I am doing research on creating a car computer with raspberry pi (so I have all the basics down before I start this project) and I am looking on a way to switch the whole device automatically whenever ...
0
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0answers
31 views

How can I schedule a task to power down USB HDD and USB Wifi?

I have a RaspberryPi B+ which I connected to an USB HDD and a USB Wifi adapter. Both works great. Also, I have running a webserver and a seafile server. Now, I want to set up a task (scheduled at ...
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2answers
55 views

UPS with battery reading

I need a UPS (Uinterrupted power supply) which I can connect via gpio to read if it is charging, the battery level, etc. Anyone know how I can make one or where to buy one from? Thanks
1
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2answers
98 views

Turning LED light on with Pi

I am looking to build a home security camera with a LED light attachment. Many people mention they use a IR Illuminator for the light source which often seem to be DC 12V. I am not sure how one would ...
1
vote
1answer
51 views

all raspberry pis connected to same breaker box are having their inputs pulled high or low randomly

I work as a tech guy for an agriculture/tourism farm. I have set up about 60 or so raspberry pis throughout the farm to control lights/props/sound effects/music/video. They are amazing and I have ...
0
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2answers
64 views

contact pin 1(3,3v supply) pin 6(0v ground) reboot [closed]

I want to supply a circuit with these two pins. But when they contact each other my raspberry reboot. Is my raspberry broken?
1
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1answer
43 views

Measuring current using test points

I understand that one can use the test points on the raspberry pi (model b) to test the voltage on the pi through a multimeter. Can the test points also be used to monitor the current on the board?
1
vote
1answer
99 views

Do 5V/3A External Batteries exists? [closed]

Need one to power my PiHUB so my project gets portable, and I don't need a cable. Unfortunately the battery packs I find on amazon, are 5V/3A ad in: 1 USB 5V/2A, and 1 USB 5V/1A ... so 2+1 = 3A ...
1
vote
1answer
174 views

Portable power supply for a PiHub?

I love my PiHUB and would like to have a or table power source, so I can make my projects mobile :) Is there any product that I could use? It uses 3A 5.2V. Alternatively I'd appreciate any ...
0
votes
2answers
454 views

Powering Raspberry pi with 12 volt input

I am trying popped a transistor while trying to power my raspberry pi from a bread board. I have a 12v battery pack that I am going to use to power my raspberry pi and some servo's. Yesterday I ...
2
votes
2answers
103 views

How long have you run your Raspberry Pi since its inception in 2012 [closed]

I would like to know how long can Raspberry pi be on without turning it off? I am looking for the maximum uptime. It's been 2.5 years since the Raspberry Pi was first launched and I am curious to know ...
0
votes
1answer
2k views

How to switch my Raspberry Pi B+ with OpenElec on and off?

I have a Raspberry Pi B+ set up with OpenElec which I happily use as a media player for movies. What would be the best way to switch it on and off in a similar way I switch my TV or BluRay Player on ...
1
vote
2answers
182 views

Building a remote drone with a pi

I am having trouble with powering my raspberry pi drone. I cant seem to find a battery small enough to let the drone fly but large enough to sustain flight for a decent amount of time. Any ...
0
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3answers
156 views

Is it possible to power a raspberry pi using android phone in USB host Mode?

the android phone can be used in USB host mode to power an arduino, pen drive,mouse. Is it possible to use the android phone to power a raspberry pi?
0
votes
1answer
211 views

Using Raspberry Pi to make Internet TV box (Power on/off issue)

I need to make a box (STB), which when plugged into TV can display live streaming URLs and can be controlled from remote control. So that a user can have the same experience as of a traditional live ...
0
votes
0answers
74 views

Pi not recognizing USB ports with an adequate PSU

So I got the Raspberry Pi B+ about 3 weeks ago and it hasn't been functioning 100% correctly... I have a PiHub to power my ehdd (1tb WD Elements), Wifi Adapter Realtek 8188CU, and (usually) the ...
2
votes
1answer
126 views

UPS for raspberry pi

I want to be able to power my pi like a smartphone (ie from battery or from mains (while charging the battery), hot swappable) I know there are boards like the MoPi that achieve this, but the ...