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.

learn more… | top users | synonyms

0
votes
1answer
23 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
0
votes
1answer
26 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
37 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
votes
2answers
62 views

USB Power Supply 5-10V

I know a Raspberry Pi needs 5 volts and 1 amp. I have here a USB power charger with 5-10 volts and 2 amps. Now I'm not the most knowledgeable person when it comes to electrics, but I assume this ...
0
votes
2answers
44 views

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

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
24 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
votes
0answers
25 views

Hardware power ON/OFF for USB

i just needed some further explanation of this question, exact same pictures with physical orientation of pins, what is needed to make a GPIO software controlled switch for usb power?
1
vote
1answer
38 views

Do 5V/3A External Batteries exists?

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
38 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
83 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
80 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
156 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
63 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
votes
3answers
68 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
90 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
41 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 ...
1
vote
0answers
52 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 ...
2
votes
2answers
51 views

Should I power my Pi and USB hub through the same power supply or separate ones?

Should I power my Pi and USB hub through the same power supply or separate ones? Because they both run. But which is better for the Pi?
1
vote
2answers
27 views

Unresponsive USB on a Raspi Model A

I've been running a headless Pi Model A (1 USB and no ethernet port) for a little while and it's just stopped working. The wifi dongle shows no life, and the pluggin keyboard has no effect. So I ...
0
votes
2answers
140 views

Reducing 24V to 5V for RPi PSU

I'm trying to power several devices off of a breadboard. For simplicity I want to power these all from the same PSU. The highest voltage amongst the devices is 24V. I was looking to use a 24V 2A ...
0
votes
0answers
33 views

No 'system halted' message when shutting down

I'm using putty to log into my pi through a serial console cable. I entered the command sudo shutdown -h now According to an answer to a previous question on shutting down the pi, I need to wait ...
3
votes
2answers
137 views

How to make Raspberry shutdown when I unplug the ethernet cable

I use my Raspberry Pi Model B with Raspbian as a server and I want to know (if it is possible) how to make that the Raspberry pi send itself a halt command when I unplug the Ethernet cable (eth0) Any ...
4
votes
1answer
87 views

UPS for Raspberry Pi and router (TPLINK TD-W8961)

I have started hosting a website on my raspberry pi, but because of the power outages, and mostly because I'm itching for a DIY project I would like to build a UPS for my pi and my router(12v-1,5A). ...
0
votes
0answers
158 views

Why I blew up my brand new B+

I blew my B+ up in less than 2 days.I want to know what went wrong to prevent it from happening again. What I remember doing: I was making GPIO to run for my RC car(1A motors), I did use TIP122 ...
1
vote
1answer
49 views

Why is pin 5 in the Ethernet connected to 3v3? is it safe to disconnect?

Looking at the pinout of the Pi's Ethernet, it looks like pin 5 is connected to the 3v3. Why is it connected there? According to the 100Base-T Ethernet specification, that should be unconnected. ...
0
votes
0answers
25 views

How much power can a Pi deliver to a SD card?

SD cards (the full-size ones) can use up to 330mW of power (100mA at 3.3V) - The Pi is known for having difficulty with certain high-speed (and thus high-power) cards, so I believe it is less than ...
0
votes
2answers
106 views

Powering a 24V 1A device

I've got a little project going where I want to hook up a load of sensors to my RPi (PH, Temp, Humidity, light etc. etc., a camera, and also power a 24v 1a DC device. I'm wondering if this is ...
0
votes
0answers
38 views

Wvdial and usb_modeswitch dont work unless Device is hotplugged

I want to connect to the internet using a 3g usb dongle. I have downloaded ppp, usb modeswitch and wvdial. Modeswitch is able to switch my from storage to modem only if I hotplug the device into the ...
2
votes
1answer
103 views

Power Pi from Li battery?

I would like to use a 4.2V(voltage varies from 3.6v up to 4.2v) Li battery to power a Pi - for this it seems like I would need a DC-DC boost converter. From what I found, all of those seem to create ...
3
votes
3answers
158 views

Pi Headless: How to confirm that the Pi is shut down

I am running my Pi headless connected to my wireless router using a ethernet cable. I wanted to shut down the pi remotely even when I am not connected to it using SSH/Putty to shut it down ...
0
votes
3answers
121 views

7.2V battery with Raspberry Pi

I want to use a 7.2V (4200mAh) battery with my raspberry pi but I need to convert the output to 5V (2000mAh), I tried the following formula: Ω = V / A but when I try to find the ohms the result ...
1
vote
2answers
72 views

power on from idle with gpio3, undocumented?

reading this thread : http://raspberrypi.stackexchange.com/a/19659/19456 i found out that you can power on the rpi from idle by connecting gpio3 (pin5 revB) to ground, tested it and it works great. ...
0
votes
2answers
80 views

Hot plugging the GPIO cable

I just got a raspberry Pi, and I am more familiar with software than hardware. Can I plug my ribbon cable into the GPIO pins if my Pi is on?
2
votes
1answer
1k views

Maximum current from usb (model b+)

I want to run the ps eye camera for my raspberry pi model b+. It is rated at 5v 500 mA . The question is , is it wise to directly connect it to the provided usb? I am using the pi to make something ...
0
votes
2answers
85 views

Raspi periodically unreachable via SSH

I'm using a RPi Model B as a file server back home. I set it up according to HTG's RPi file server guide, so I'm using SFTP to access the files on it. The RPi is wired to a Linksys router functioning ...
4
votes
2answers
200 views

What power supply should be used for the B+ model?

So I'm thinking about purchasing a RPi B+ model, and the Pi website states that the power supply should output 2A through a Micro USB supply. OK, but in terms of volts what should it be? Is 5V ...
5
votes
5answers
2k views

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
votes
2answers
72 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
vote
2answers
69 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
votes
2answers
176 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
votes
2answers
99 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. The problem is that when it shuts down unexpectedly (i.e. there is a blackout, or DC ...
0
votes
0answers
92 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
votes
0answers
40 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 ...
1
vote
1answer
90 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
vote
2answers
189 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
votes
0answers
49 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 ...
1
vote
1answer
66 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 ...
1
vote
1answer
92 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
votes
1answer
44 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
votes
2answers
211 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 ...