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
28 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
16 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
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1answer
43 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. ...
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0answers
33 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
217 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
79 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
27 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
vote
1answer
73 views

External shutdown (properly) button?

I have a R-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 buttons to, ...
0
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1answer
38 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 ...
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3answers
116 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
76 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
222 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 ...
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0answers
28 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 ...
0
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1answer
37 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
vote
1answer
56 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
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1answer
43 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
50 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?
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1answer
36 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
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1answer
62 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
76 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
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2answers
192 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
98 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
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1answer
1k 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 ...
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2answers
107 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 ...
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3answers
106 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
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1answer
107 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 ...
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0answers
60 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 ...
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0answers
85 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
56 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?
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2answers
30 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
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2answers
317 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 ...
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0answers
42 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
158 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
115 views

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

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
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0answers
244 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
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1answer
54 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
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0answers
26 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
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2answers
140 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
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0answers
54 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
115 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 ...
4
votes
3answers
223 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
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3answers
179 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 ...
2
votes
2answers
101 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. ...
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2answers
91 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
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1answer
3k 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 ...
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2answers
112 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 ...
5
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2answers
591 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
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5answers
3k 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
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2answers
111 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
102 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?