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Questions tagged [power]

Power is the rate at which energy is supplied or consumed, often measured in Watts. This tag covers electrical power specifically, the voltage and current specifications for supplying power to the Pi, the specifics of power consumption by the Pi, and methods for controlling Pi power consumption.

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Why am I getting a rainbow screen and flashing red PWR LED with a new Raspberry Pi 3B+?

I think there might be a problem with my new Pi. I'm using the same power supply (purchased from PiHut for my previous 3B) in the new 3B+ but I get the rainbow screen and the red power light flashes ...
Shawson's user avatar
  • 213
2 votes
1 answer
12k views

What are the Electrical Specifications of GPIO pins?

What are the Electrical Specifications of GPIO pins; current limits and voltage levels?
Milliways's user avatar
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56 votes
11 answers
52k 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 ...
user avatar
30 votes
6 answers
81k views

Choosing a Pi4 power supply

I'm trying to decide what is the best option for powering a Pi4. The specs mention for a minimum of 3A. Let's consider we would also like to connect a 2.5" drive to the Pi4. Could someone more ...
m000's user avatar
  • 483
43 votes
5 answers
77k views

How Raspbian Detects Under Voltage

How does the Pi know it being underpowered and to show the lighting bolt? As most of us know, if you use a bad power supply you get the lightning bolt telling you are underpowered. I noticed that when ...
NULL's user avatar
  • 2,230
34 votes
8 answers
74k views

How to safely switch off the Raspberry Pi?

Usually with a desktop computer, if I run sudo shutdown -P now, the computer switches off completely and I can switch it back on again with a button. (Likewise, if the computer crashes, I can force a ...
George Simms's user avatar
15 votes
2 answers
14k views

Use MacBook charger for Raspberry Pi 4

I am using the official 15.3W USB-C Power Supply to power up my Raspberry Pi 4. I got my self a second Raspberry Pi 4 but I haven't bought the power supply yet. Would I be able to use the Macbook ...
Dino's user avatar
  • 373
45 votes
2 answers
159k 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 ...
geerlingguy's user avatar
  • 1,636
21 votes
4 answers
22k views

Current draw for +/2/3/0 models

Essentially "What's the current draw and supply voltage tolerance?" but for newer models.
Alexander M's user avatar
45 votes
5 answers
74k views

Power consumption of Pi Zero W?

For those who have the Pi Zero W with them, what is its power consumption in the following modes: No peripherals connected, WiFi And Bluetooth off Only WiFi turned on Only Bluetooth turned on Only ...
HRJ's user avatar
  • 553
4 votes
1 answer
2k views

RpiZero Power Supply through 40 pin Power/GPIO Header or microUSB connector

As the title states I want to power my pi-zero with an adafruit powerboost 1000. I have looked into ways to do this and it seems there are 2 possibilities: Use the USB output of the powerboost to ...
NG.'s user avatar
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88 votes
3 answers
196k 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)?
Zero's user avatar
  • 923
7 votes
2 answers
27k views

Raspberry Pi 4 B GPIO boot and shutdown button(s)

I've been doing some research on power buttons for the Raspberry Pi, but I'm having quite a hard time finding information. Right now, I have button working on GPIO5, and when I connect it to the ...
are_end's user avatar
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6 votes
2 answers
10k views

Can Rpi3B+ power two USB SSD drives?

Can I power two usb drives using USB to satas or do i need a powered USB hub?
sealfab's user avatar
  • 209
50 votes
2 answers
117k views

Raspberry Pi 3 vs Pi 2 power consumption and heat dissipation

I've seen the announcement of the new Raspberry 3 but didn't find any info regarding power consumption and heating. A 1.2 Ghz 64-bit CPU is great but does it draw a lot more power? Shall heat be an ...
Cedric Martin's user avatar
2 votes
1 answer
1k views

How to switch the current draw to 1.2A instead of 600mA?

On the website of raspberry pi 2 I read that the current draw for usb ports can be switched from 600mA to 1.2A. I searched around and I couldn't find anything that shows how to do that, I went to ...
Ahmed Al-haddad's user avatar
43 votes
5 answers
99k views

How do I measure the current power consumption?

Is it possible to measure (with software, like PowerTOP) the Pi's current power consumption, on my Raspberry Pi?
cupakob's user avatar
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15 votes
4 answers
11k 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 ...
TiernanO's user avatar
  • 321
10 votes
2 answers
15k views

Battery Power Requirements

Is this Maplin Power Bank 4000mAh pwerful enough to power the Pi with all of the peripherals below? This is useful as I cannot order online, and it is currently £15. I have a Raspberry Pi Model B, ...
Wilf's user avatar
  • 2,523
4 votes
2 answers
6k views

Portable power supply for RPI3 and official touchscreen requirements

I have recently bought and assembled a Raspberry PI 3, official touchscreen and case / enclosure. I want to be able to use it whilst out and about with a rechargeable battery and if possible allow ...
jaget's user avatar
  • 163
5 votes
2 answers
1k views

Pin powered Pi crashes when servos move

I have been working on a circuit to power a Raspberry Pi and servo(s) from a single power source. The diagram below shows the basic configuration, although the 'AA battery' is actually two 18650s. ...
Dan Nicholson's user avatar
4 votes
2 answers
6k views

What happens to the GPIO voltage after shutdown?

I don't have a Raspberry Pi laying around at the moment and I would like to detect if my Raspberry Pi is shuted down. My Idea is that maybe after the Pi shutted down the Voltage at the 3V3 pin will ...
Freygeist's user avatar
36 votes
8 answers
131k 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 ...
Joel's user avatar
  • 527
24 votes
4 answers
29k 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 ...
James Vickery's user avatar
18 votes
1 answer
59k views

Powering the Pi 4 - safe voltage levels and current requirements

How to safely power the Pi 4, more specifically: What voltage levels are safe to power the Pi 4 via the USB-C connector or via the GPIO header? What are the current requirements? What Power ...
Ghanima's user avatar
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10 votes
2 answers
4k views

Is there any point to a 2.0A (or greater) power supply, given the 1.1A polyfuse?

My question: it's my understanding, based on the official Raspberry Pi FAQ, the wiki, and numerous forum threads on Stackexchange and elsewhere, that the Raspberry Pi has a 1.1A polyfuse on the micro-...
user14384's user avatar
  • 101
8 votes
2 answers
12k views

Starting Pi 4 with global_en

It seems that those pins can be used to start Pi 4, but I am not sure exactly how. Can a Pi 4 start after having been shut down by the shutdown menu, if I connect the two holes like below for a short ...
Damn Vegetables's user avatar
5 votes
4 answers
2k views

Powering the Pi from battery (power consumption)

I've got a Pi 2 B+ and I plan on using one of those portable battery-powered phone chargers to power it. I'd like to get about 8 hours of continuous power. I'll also be powering a 5-inch LCD and a ...
Tarc's user avatar
  • 53
4 votes
3 answers
4k views

How long to wait after shutdown to cut power

I am working on a problem that seems to be fairly popular with the Raspberry Pi community. In essence, I am designing a circuit that will utilize a DS3231, a 555 timer, and a load switch to cut power ...
nichollsg's user avatar
  • 153
2 votes
3 answers
9k 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 ...
Hanno Hirschberger's user avatar
20 votes
9 answers
47k views

Use Raspberry Pi to control PC's power switch

Can I use the Raspberry Pi's GPIO pins to make the Raspberry Pi act as a switch? I would like to shut down, boot up and reboot my computer via hardware remotely. My idea was to take the PS_ON# pin ...
d3rrial's user avatar
  • 303
15 votes
2 answers
17k views

How to make the Raspberry Pi consume less power

What methods can be used to reduce the amount of power a Raspberry Pi uses?
Darth Vader's user avatar
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13 votes
2 answers
75k 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 ...
Szabolcs's user avatar
  • 662
11 votes
5 answers
40k views

Can Rpi4B power external / portable USB HDD / SSD?

I was not able to power an external HD directly from a Raspberry pi 3 (the HD was constantly complaining about a lack of power). Would a Raspberry Pi 4 be able to power a portable hard drive (using ...
raspberry's user avatar
  • 111
8 votes
2 answers
14k views

How to make a high powered USB hard drive work with the Pi?

I tried directly connecting my WD My Passport Ultra 1TB USB hard drive to the Pi but it draws too much power, and it doesn't even run the OS. Is there any way to connect it without damaging the Pi?
Anderson Reyes's user avatar
8 votes
3 answers
6k views

Does Raspberry Pi Zero have a polyfuse?

The question says it all. If you have a definite answer, it would be great if you could post a photo of the pi zero, where the fuse is pointed out.
Stowoda's user avatar
  • 446
7 votes
1 answer
4k views

What are the cooling requirements for Raspberry Pi 3?

The new Raspberry Pi 3 has been beefed up from the previous version. Now it comes with a Broadcom BCM2837, which is an ARM v8 quad-core Cortex-A53, clocked at 1.2GHz. I have also seen somewhere a ...
Vassilis Papanikolaou's user avatar
4 votes
4 answers
3k views

Powering Raspberry Pi via battery pack and buck converter - how to solve low voltage reboot issues

I'm trying to power a Raspberry Pi 4 via a 6-AA battery pack via buck converter which steps it down to 5V but it gets stuck in a reboot loop on boot up. Watching the display on the buck converter, the ...
g491's user avatar
  • 143
4 votes
2 answers
4k views

Pi 3 Model B+ doesn't boot - Power Supply or broken?

I just bought a Raspberry Pi 3 Model B+. I also bought a power supply that the reseller sold specifically for the Pi - it delivers up to 3A. However, the Pi doesn't boot. I gives me the rainbow screen ...
DisplayName's user avatar
4 votes
1 answer
13k views

I short circuited 5v & gnd of Rpi

Accidentally I short circuited 5v & gnd of R-pi, since then my R-pi is not working. How can I make it start again by means of replacing some IC or power regulator or anything ? Please help.... ...
user77339's user avatar
3 votes
1 answer
2k views

Disable boot on plug in power cable

I'm owning a Rasperry Pi3 I want to disable automatic boot when plug in power cable. I don't want to use a simple mechanic switch because I want passive power still avaible for the board for various ...
user59821's user avatar
3 votes
3 answers
2k views

Does Raspberry Pi 4 consume considerable amount of power in soft-off state?

In the Start menu (you know, the fruit button at the top-left corner), I clicked shutdown. I did not unplug the USB-C power cable. The red light was still on, but I thought it was like the sleep light ...
Damn Vegetables's user avatar
2 votes
2 answers
12k views

Can I use an Apple USB-C power supply on a RPi4?

As I was upgrading RPi3's in the field, I was surprised to find RPi4 has a new connector (USB-C) for power... I could not find any documentation on RPi4's power supply specs, other than admission of a ...
BIZO's user avatar
  • 21
2 votes
1 answer
2k views

Powering Raspberry Pi 4 'on the move' using power bank [closed]

There are good official resources that state that recommended power supply must be 3 amps (e.g. official RPi power supply via mains). However, for use 'on the move' or remote locations this may not be ...
ChiralCode's user avatar
2 votes
1 answer
4k 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 ...
goldilocks's user avatar
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1 vote
2 answers
1k views

HDMI power circuit on the Raspberry Pi 4

The previous models of the Raspberry Pi used different circuits to connect its 5 V power rail to the HDMI connector, i.e. How much current can I draw from each model's HDMI socket? Especially the ...
Ghanima's user avatar
  • 15.9k
1 vote
2 answers
429 views

Reliable 5v relay

I have been using raspberry pi for my home automation project. To control 12v power, I use 5v relay low triggering to turn on or off the power. My coding and connection work fine. Problem is ...
Chuljung Kwak's user avatar
0 votes
2 answers
6k views

How to know if Raspberry is running

I'd like to implement an electronic circuit to be able to restart my raspberry Pi when it has been shutdown (without plugging in and out the USB charger, which will obviously remain plugged all the ...
Orabîg's user avatar
  • 103
20 votes
4 answers
19k views

Raspberry Pi lifespan reliability

I have to set up a three monitor display for a museum, that will run 24/7 , and I think about a simple Pi wall. But I'd like to know if a Raspberry Pi is a good long term solution. The system will ...
Spoutnik16's user avatar
9 votes
5 answers
9k views

Does the Raspberry Pi 3 regulate the voltage on its 5V pins?

I need to supply 5v analog power to an adc. I am supplying the pi with Li-ion batteries, so the voltage falls over time, but does remain within range of the pi's required input. If the input voltage ...
RPGuest's user avatar
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