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.
-1
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1answer
38 views
A good battery for model A with listed periherals?
A good battery for model A with listed periherals?
ok so I'd like too run a raspberry pi model A unplugged for about 2-3 hours with a camera module streaming video via a wifi adapter, I have a budget ...
1
vote
1answer
96 views
Is it possible to power the RPi by re-assembling the ethernet port?
Based on this schematics document, I think it is possible to power the Raspberry Pi using the Ethernet port. (See page 3, location 5-6 I-J.)
Unsolder the Ethernet connector, take pins 4,5 and 7,8.
...
1
vote
0answers
58 views
Auto-start X application from read-only file system
In order to protect the SD card in an application which may suffer a sudden loss of power I am attempting to mount the root in read-only mode.
In the working (read-write) system our full-screen ...
6
votes
1answer
308 views
Setting up the Raspberry as a data logger
As the title states I'm working on a simple embedded application which reads some information from the serial port and logs it to file, in addition to displaying a bit of status on the display.
I'm ...
0
votes
1answer
40 views
What does the power button in the corner/log out in the menu do?
Ok,
I'm really starting to like the Raspberry Pi.
But then, while I was searching the bar at the bottom, I came across the power button.
I checked the menu, and there was the power button, with a ...
1
vote
1answer
117 views
Closing a circuit with GPIO
I'd like to use the GPIO pins on my RasPi to close a circuit. I don't want any power applied to the circuit either from or to the RasPi, just something as simple as touching two wires together to ...
2
votes
5answers
96 views
What should I take into account when trying to decide between an Arduino Uno or a Raspberry Pi for my application?
I am designing a device that will have an accelerometer and temperature sensors.
This device is intended to record patterns in activity of individuals throughout the day. The data collected will be ...
1
vote
2answers
129 views
Easiest way to control a pis power supply via usb
This may be an easy question for electronically inclined, but I am not too savy in that area.
I have a little bramble in a rack, where I don't necessarily have access. The bramble has an x86 master ...
1
vote
1answer
123 views
How to supply redundant power to a Raspberry Pi from two PC usb ports?
I would like to add a Raspberry Pi to an existing two-node server setup to get an utility / playing / monitoring linux system independent from the two PCs, but I can not actually consume another mains ...
2
votes
1answer
39 views
Power consumption and instruction cycle frequency
I am making a small, mobile device that depends on batteries. It will only require a high CPU frequency occasionally and is at a low frequency the rest of the time. The default frequency is 700MHz. ...
3
votes
1answer
74 views
Can I power the device via the “Big” USB Type A connectors? [duplicate]
For connecting external hard drive I want to use an active USB hub.
I found some USB hubs which seem also to power the upstream ports.
While this is under normal circumstances very bad I was ...
4
votes
2answers
353 views
Battery pack for model B RPI, Thoughts?
Thinking of getting the battery pack linked to below for my model b Raspberry pi, i am wondering if anyone knows anything about it and how could it is because for first glance it looks amazing. Thanks ...
2
votes
1answer
127 views
Can I power two Raspberry Pis from one Powered Hub?
I have this hub: Mod My Pi 4 Port USB Hub, which is recommended for use with the Raspberry.
I have two Raspberries but one Hub. My Question is:
Can I power both Raspberries at the same time, without ...
4
votes
1answer
319 views
How long can a RaspberryPi run for on 4 or more AA batteries?
I'm looking to power my RaspberryPi via rechargable batteries, but I would like to know how long can it run for running X number of batteries. I want to eventually be able to mount it outside and ...
3
votes
1answer
610 views
How much energy does the raspberry pi consume in a day?
My searching efforts have failed when trying to find this. On average, how much energy does the raspberry pi consume in 24 hours ( minimal usage vs max usage in a day AND usb vs micro usb powered)?
0
votes
1answer
157 views
Raspberry Pi failed to boot, power led remains off
Connect my Pi model B to mac USB port. The power LED remains off. There is excessive amount of heat generated at the component highlighted in the pic. Any idea how to resolve?
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1
vote
1answer
449 views
USB Power backfeed without Polyfuse mod
I recently got hold of a Lapdock, and was busy trying to make up my own cable adapter to turn it's Micro Male connector into a Mini Female one to make it more generic so that I can use it for anything ...
2
votes
2answers
790 views
one power supply for raspberry pi and external HDD
I have my Pi and a USB powered external hard disk. I am looking for a way just to have one plug for the both of them. At the moment my Kindle Charger doesn't have adequate power to power them both.
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2
votes
4answers
538 views
Pwr LED is solid red, OK LED flashes green once, no display
Power is good - I've tested with a voltmeter. According to this link, the SD card image is not written properly yet:
The Raspberry Pi cannot find a valid image on the SD card. Check card is ...
2
votes
1answer
364 views
Powering Portable Rpi
So I would like to have a laptop-esque setup with my rpi. I have my pi, my keyboard, and I want to buy a small USB monitor along with an external battery pack with USB ports. My question is to make ...
3
votes
7answers
429 views
Guaranteed Power Supply
I would like someone to point me to (preferably an amazon link) a power supply that is guaranteed to work with my RPi and provide enough power for ethernet, and possibly a keyboard and mouse.
In the ...
2
votes
2answers
683 views
suspend for a fixed time interval
I want raspi to (1) bootup, (2) do a task, (3) go into suspend mode for x amount of time, (4) wake up and do it all over again.
1 and 2 are easy: sudo crontab -e, which has just one line: @reboot ...
4
votes
1answer
949 views
Turning on and off a 3G (or any USB) port?
I have a project which will require using a Raspberry Pi in a low power environment, but it will also require a 3G connection. I have not done any tests, yet, but I am under the assumption (and ...
4
votes
2answers
1k views
How do I measure the current power consumption?
Is it possible to measure (with software, like powertop) the current power consumption on my Raspberry Pi?
2
votes
1answer
453 views
Overclock after power failure not possible
Immediately after install, I've overclocked my raspberry (1 GHz). After power failure today (the whole building) I can't overclock it again. First I tried:
sudo raspi-config
Then I tried to make ...
20
votes
6answers
2k views
Can I use Raspberry Pi as a USB peripheral device?
Raspberry Pi has a Micro USB port for power supply. My question is if this port is only for power purposes or can it be used for data as well? I would like to be able to attach my Raspberry Pi as a ...
