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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3answers
352 views

Code/Cron to detect low power and safe shutdown on GPIO

I've made a portable wildlife camera which uses a 8 x AA UBEC battery pack and I am looking for a way to safely shut down the RPi when the power starts to get low. Is there currently any code that I ...
1
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0answers
35 views

Cannot connect to PiCamera when using it with Flask

I am trying to create a live streaming camera with my Raspberry Pi and the Pi Camera module. I have chosen to create it with Flask so that I can use the Python API for it. Though when I run this ...
0
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1answer
50 views

Can I power a Raspberry Pi 3 with a Smart TV's USB-Port?

We use a Raspberry Pi to display infos on a TV. The content is more or less HTML with some Animations. Currently we use a Pi2 and the power does not seem to be a problem. Recently we came up with the ...
3
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1answer
32 views

Switch power banks by temporarily attaching two of them

I'm having a hard time finding out, if it's possible to have two power banks attached to a pi. Is there something like an Y-cable or something? Use case is, that I'm planning on doing a timelapse ...
0
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1answer
14 views

Peripherals power usage

I am trying to measure the power usage of a Raspberry Pi peripheral, say a temperature sensor, and compare it with wall power input to the Raspi. Is there a device that measures the power a ...
5
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2answers
89 views

Is there a way to shut off power to the HDMI output?

I have a 5" display that runs entirely on the HDMI connection to the Pi, including power. Unfortunately, the display has a backlight which can't be switched off unless it is completely disconnected ...
1
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2answers
244 views

Check if current if flowing through 220v ac wire

I want to add a third switch to a room with two existing switches. This third switch will be simulated by a 4 relays and a raspberry pi. Image source: wikipedia, Multiway_switching So 1 have one ...
0
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0answers
21 views

Control 434 MHz US remote outlets without spoofing

I'm looking for hardware or a way to control remote outlets using my Pi, which are compatible to US-outlets and without using a spoofer to set it up. I tried to use Etekcity power outlets like ...
1
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1answer
57 views

How do i turn off the raspberry pi 3 [duplicate]

What easiest way to turn off/shut down the raspberry pi 3 model b? Would it be easier to just pull out my power source plug or to click menu --> shutdown --> shutdown and pull the plug or does it just ...
11
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3answers
1k views

Is it okay to just pull the plug?

Whenever I turn off my pi, I use sudo poweroff, which (in my understanding) is a safe way to stop all processes and shut down. Although sometimes when I'm using the Pi for embedded projects where I'm ...
1
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3answers
33 views

Can I power my rpi with netgear WNDR3700v5 router?

I currently own a netgear WNDR3700v5 router which has 1x usb port and I was wondering if I would be able to power my rpi (Pi 2 Model B) + 2.5" external HDD with it. The PSU for the router is 12v 1.5A. ...
0
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1answer
26 views

Use Raspberry Pi to control PC power button [duplicate]

So after a ton of dinking around with WOL over the internet and having varied levels of success/failure, I got fed up and decided I would try this. I don't have a Pi currently, but I have heard that ...
0
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0answers
57 views

Repairing Raspberry Pi 3 [closed]

I recently fried my Raspberry Pi 3 by powering it with a UBEC over the 5v rail by the GPIO. Although it worked for a couple weeks it suddenly failed and my Pi would no longer boot with the UBEC over ...
2
votes
2answers
37 views

Power an external target

What hardware do I need to power an external target. Preferably something that can be connected to USB. I have a simple case where I want to turn on a device if someone has the right rfid-chip at my ...
1
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1answer
45 views

Does being undervoltage decreases the Pi's performance?

I recently blew up the 5V 2A PSU that came with my Pi. Since then, I am using my phone's charger, 5v 1A to run my Pi. And while it runs fine most of the time, I see the undervoltage warning, while it ...
0
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0answers
18 views

Reboot Loop when manually rebooting device

I have an issue which i have not been able to find an answer to. I have a B+ which i would like to set up to reboot once per day. The problem is, when i reboot the device it ends up in a reboot loop ...
1
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2answers
88 views

Power up from USB Cable or GPIO?

I have made a battery pack to power up my Raspberry Pi 3 for a project. The pack uses 2 Samsung ICR 18650 Li-Ion batteries (connected in series) and a 5V 3A UBEC and gives 5.05V output. Now I'm a ...
0
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1answer
61 views

What is the best connection for Raspberry pi3 model to PC/laptop?

I heard we can connect Raspberry pi to laptop or PC Or Tv through LAN(Coaxial cable) and UART(serial to USB converter). Which one is gives better performance,speed(data rate). Instead of these two,is ...
0
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3answers
92 views

Power USB device over Raspberry Pi GPIO Pin

for an embedded system I need to be able to switch certain USB devices on a RPi on and off without physically disconnecting them. The whole setup will be in an enclosed casing. My idea now was to ...
1
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1answer
42 views

Raspberry Pi fuse (F1) and cpu (IC2) is so hot and not booting, what's wrong?

My Raspberry Pi was working great but after a couple of hours I found it not booted. then I found out it's CPU and F1 fuse are extremely hot. I unplugged it and let it to rest for half an hour, then I ...
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2answers
36 views

How can I measure current with RPi at high voltage/high current (100-120V / 0-30A)

How could I measure current with a raspberry pi at voltages and currents that can be found inside a typical home's power outlets? The goal is to create a device that monitors how much energy is being ...
1
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1answer
106 views

Connecting external Hard Drive to Raspberry Pi 2 [duplicate]

I am trying to connect a 2 Tb external Hard drive (ADATA HD710) to my raspberry pi, but the problem is that when I connect it to one of the USB ports, the raspberry pi stops working. I am not sure if ...
0
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1answer
28 views

When power is broken or powered off [closed]

I've been searching hi and low and I just haven't found anything.. I'm a starter and looking for some advice on the types sensors to get to create a project that allows me to Monitor a power source. ...
3
votes
1answer
91 views

How is the USB power regulated on +/2/3 models?

This question and my very tentative (dubious even to me) speculation that the cause might be the main polyfuse on the 5V regulated supply common to all (?) Raspberry Pi's left me wondering about how ...
1
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1answer
39 views

Low-power options for powering RPi for long period of time [closed]

I want to put an untethered RPi in the middle of a field and let it check and log the temperature for a week or more at a time. If I wanted to run off of a rechargeable battery to wake up every hour,...
0
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1answer
65 views

Powering a Raspberry Pi from a vehicle battery 24/7

I am working on a project where my Pi is always connected to a vehicle to provide its GPS information. Seeing such a device must be always turned on, I am attempting to tap into a battery line that ...
0
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0answers
41 views

udisks - failed to suspend USB device

My external drive stopped spinning just fine after I power it down using this command: sudo udisks --detach /dev/sda However I always get this error of failed to suspend the device: Detach failed: ...
1
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2answers
42 views

Raspberry Pi Power usage monitoring

How can I assess whether my power source is sufficient for the Raspberry Pi 3 I am running (including all peripherals)? Is there a tool which can be installed on the Pi to install this or will ...
1
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0answers
22 views

How long to short RUN pin on pi zero to initiate boot? [duplicate]

I've been working to design something that can automatically short the RUN pin to GND when I want to turn my pi zero on from a full poweroff. The RUN-GND short works well to turn it on, but does ...
1
vote
1answer
104 views

Power Raspberry Pi 2 From vehicle battery

I have seen many tutorials and blogs of people setting up their PI 2 in their vehicles for media systems etc. I would actually like to attempt the following however I am unsure how to power the pi. I ...
1
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0answers
26 views

Powering RPi3, 3G Dongle, DC Motor HAT and DC Motors

I've got a setup where I power RPi, 3G dongle from one power source (USB Hub powered from 5V 2A) and a DC Motor HAT and DC Motors (2 small car mirror motors) from a 12V 2A supply. I checked the motors ...
11
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5answers
2k views

Why do the Pi GPIO pins use/give 3.3V and not 5V?

I know for a long time that people should NOT put more than 3.3V on the GPIO pins. They also give out 3.3V when high. Cue weed jokes I did some research and it seems no one really bothered asking. ...
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2answers
108 views

Sending extra power to PI3 over USB, will it damage the device?

I used to get poor performance from my PI 3 since I had a few heavy load programs running on it. After needing more than 128GB of MicroSD storage I got a USB to SATA cable and hooked up a 500GB SSD ...
6
votes
1answer
122 views

How does RPi “know” when it hasn't got enough power

When running X and when it's not content that it can draw enough power from the adapter, my RPi displays an RGB colour square on the screen. (At least, I THINK that's what the RGB colour square ...
5
votes
2answers
345 views

max_usb_current possible values

I have found many hints mentioning that setting max_usb_current=1 in /boot/config.txt allows USB ports to draw up to 1.2 A My question is what are other possible values that can be assigned to ...
14
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2answers
1k views

Measure RPi3 power consumption without external hardware

I power my RPi3 using a power bank for smartphones, and I'd like to check how much power the Pi draws from it while my project is running. I don't have any special equipment for power measurement. Is ...
0
votes
1answer
43 views

Powering the Pi through GPIO

I have seen many tutorials about powering the Pi through the GPIO. My question is why do people do it? By powering the Pi through the GPIO, you lose protection from surges in current and voltage, so ...
1
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1answer
100 views

Powering up the Pi 3 with Samsung ICR16850 LiPo battery

I am working on an autonomous robot which is controlled by my RPi 3. I was concerned about how to power up the Pi, so I dissected an old laptop battery and got 6 Samsung ICR16850 LiPo cells from it. ...
1
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2answers
91 views

Cannot boot raspberry Pi 3 connected to DVI with SDXC class 10 sd card

How do I boot raspberry pi 3 with noobs installed on it. Steps I have done so far. Got NOOBS from the RPi downloads. Samsung EVO 64gb micoSDXC class 10 Formatted the SD card with SDformatter from ...
0
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2answers
66 views

Multiple questions about power and USB hubs

I am planning to use my RPi as a basic desktop. I have a few questions I am using the first model of the RPi I am planning to connect a keyboard, a mouse, a bluetooth adapter, a WiFi adapter, and ...
2
votes
0answers
58 views

Is my RPi3 damaged? [IT'S WORKING NOW] [closed]

I put the GPIO pins for my senseHAT the opposite way round (so that the senseHAT was facing away from the pi). I powered the RPi and when I tried to handle it I got slightly shocked by the senseHAT. I ...
0
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0answers
34 views

Why does my RasPi Model B (256 MB) have low voltage?

I have an old rev.2 (I think) model B. It already has the 000 Fuses, but still only 256 MB of RAM. I wanted to use it for some small projects, but it does not run very stable. I tested TP1 and TP2 and ...
0
votes
2answers
57 views

Read Supplied Power to Raspberry Pi

My Raspberry Pi2 is freezing. Some online forums mentioned that freezing is due to inefficient power supply (as minimum allowed voltage is 4.75 v). In order to test this, I want to have a running job ...
0
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0answers
38 views

Raspberry Pi Zero Ethernet Issue

I've found a weird issue while using the pi zero. I have a RJ-45 Ethernet to MicroUSB adapter that works, only when plugged into my NETGEAR WN2500RP Extender. I've tested the connection on both the ...
1
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1answer
40 views

Controlling/switching on/off devices via relay board

I was wanting to use my Raspberry Pi 3 to turn on/off devices. I found this board which looks like it would do the job: http://www.amazon.com/JBtek-Channel-Module-Arduino-Raspberry/dp/B00KTEN3TM/ ...
3
votes
1answer
228 views

How did this ruin my pi?

Problem I have a 5 inch Waveshare Touch Screen. I was testing something today and had power going to the screen (not the pi) which is okay because they share power when connected correctly. I was ...
0
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1answer
111 views

Raspbian won't boot when hard drive is connected

Not sure if this has anything to do with the make/model of hard drive I'm using, but when I connect my WD MyPassport Ultra to my Raspberry Pi 2 and then reset Pi, Raspbian doesn't load. If I just plug ...
1
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1answer
37 views

Terminal Block Power Supply

I am beginning to build a "control centre" to deal with various elements of my vivarium. My largest desire is to be able to control the heat source, so I was wondering if there is a terminal block ...
0
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0answers
35 views

My Pi boots and runs Raspbian but in 1 or 2 minutes from running it it turns off and I have to reboot and reinstall everything

I have to reinstall NOOBS in the SD again every time. Also it tries to boot after it turns off but it then goes off again.
6
votes
2answers
112 views

How much current can I draw from each model's HDMI socket?

I've seen a few questions that speculate as to how much current is available from the HDMI socket but I can't find any concrete values. I've gotten away with using a couple of different HDMI to VGA/3....