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
21 views

Problem when trying to get a DC motor to run using the L298N H-Bridge?

My setup is as follows: Using this motor controller board, I have one DC motor (I'm new to electronics, so I'm not sure when I say it's rated at 1.5V, because one 1.5V AA battery on its own makes it ...
0
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1answer
30 views

Advice on Using the Pi2 as a NAS vs NAS device with Pi2 attached

I want to build a home NAS and with my Raspberry Pi 2 and also have XBMC installed on it and need some advice on the route to go. The storage will be used to stream movies from (via XMBC) and also to ...
0
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1answer
19 views

can't make my RPI booting

i m a manupilating RPI B+ for the first time excuse me for my language i m Tunisian and i m having problem with making my RPI works headless ,the first one is i m using win32diskimager to write ...
0
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0answers
64 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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2answers
40 views

what if my charger output is 5V 750mA for pi 2?

By the RASPBERRY PI 2 MODEL B specs: http://en.wikipedia.org/wiki/Raspberry_Pi The power rate of it is 800 mA, what are the possible effects if the charger output is lower or higher than 800 mA?
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1answer
49 views

Raspberry pi 2 shuts down when TV does

I had a rPi Model B for a long time...and now i got an rPi2 but i am having a small problem with it. I had the same problem with the 1st pi but i dont remember what i did to fix it. Sometimes it goes ...
0
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1answer
26 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 ...
1
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1answer
37 views

Pi 2 odd behavior of power system

My Pi 2 sometimes does not power on properly -- just the red LED comes on and there is no further activity. I've done this a bunch of times and there is a consistent pattern. If it happens with no ...
1
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4answers
73 views

Can you use a Raspberry Pi to write code that powers an onboard LED or motor or fan? [closed]

In other words, is it possible to solder on an LED or a fan or a motor (perhaps even a custom-made piece of hardware) and then write software that can send power from a battery to the added device? ...
0
votes
1answer
53 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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2answers
129 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?
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2answers
62 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
82 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
59 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
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2answers
60 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
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1answer
57 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 ...
3
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1answer
2k 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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4answers
86 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
213 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
60 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 ...
1
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2answers
79 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
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5answers
320 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
18 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
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4answers
676 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
67 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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1answer
107 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
101 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
62 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
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4answers
149 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
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1answer
110 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
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1answer
80 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
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1answer
36 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
58 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
52 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
247 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
169 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
52 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
374 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
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1answer
72 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
474 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
votes
1answer
278 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, ...
1
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2answers
357 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
33 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 ...
1
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2answers
59 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
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2answers
105 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
53 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
66 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
vote
1answer
47 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
120 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
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1answer
212 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 ...