Linked Questions

1 vote
1 answer
14k views

What is the max voltage that the Raspberry Pi can handle over the USB plug? [duplicate]

I've been trying to make my own lower-cost power supply for the Raspberry Pi (my cellphone wall adapters don't provide clean enough 5V power for the Pi 3B+) with a 12V wall wart I have laying around ...
ifconfig's user avatar
  • 127
0 votes
1 answer
2k views

Raspberry Pi 3 with Samsung charger [duplicate]

So I found a Samsung charger with no quick charge just a normal one. But it outputs 5.3 V and 2 A. I've read at other forums that it shouldn't pass 5.25 V. So I wonder if it still safe to use it to my ...
user58642's user avatar
0 votes
1 answer
3k views

Can I use a 5V 4A USB charger as a psu for Raspberry Pi 3? [duplicate]

I want to power my RPi-3 using a 4A 5V USBcharger. I connect a hard drive, wireless keyboard adapter, and a pendrive usually and I get a yellow coloured lightning bolt on the upper right side corner ...
Shogan's user avatar
  • 1
0 votes
2 answers
1k views

Rpi Zero W ( not Rpi 2,3 ) - power consumption, idle and GPIO operate [duplicate]

Spec wise - all raspberries require 5v 2A input. My project needs multiple remote rpi’s to send periodical status of GPIO using python script ( runs on Raspbian Strech Lite ). Is a 2A a must ?
guyd's user avatar
  • 578
-1 votes
1 answer
164 views

Raspberry PI Portable USB Charger [duplicate]

I bought a $5 usb charger that I am using to power my Raspberry Pi. The charger works decently but I am noticing that every once in while the raspberry pi will reboot. I have read that some chargers ...
sirshakir's user avatar
0 votes
0 answers
47 views

My Raspberry pi keep show msg : low voltage warning please check your power supply [duplicate]

I have Raspberry pi 3 , and I am using its power supply which give 5V -2.5 A , the problem is that the raspberry Pi keep show this message : low voltage warning please check your power supply
0ussama's user avatar
  • 11
77 votes
5 answers
185k views

What is the maximum current the GPIO pins can output?

What is the maximum amount of current that can be pulled from a single GPIO pin? Does the maximum current decrease if current is being pulled from multiple GPIO pins? From my research, I've found: ...
spuder's user avatar
  • 1,163
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
12 votes
9 answers
16k views

What is the highest voltage from the power supply a Raspberry Pi 3 B can handle without getting damaged?

I am using Android things on Raspberry Pi 3 B with a 7-inch touch screen. Currently, I always see a yellow thunder bolt sign on the screen which means that the Raspberry Pi isn't receiving a high ...
Mena's user avatar
  • 237
4 votes
5 answers
92k views

Raspberry Pi 3 Model B+ Stable Red Light When Powered Up

I recently got a new Raspberry Pi 3 Model B+ and I managed to flash the OS. But the problem seems to happen when I try to boot it. I do not have the official adapter, but I tried the following: with ...
joesan's user avatar
  • 197
9 votes
3 answers
41k views

Get reading of RPI supply voltage

On the most recent pi I've been playing with I've noticed the under-voltage lightning bolt warning, discussed on this question. My question is whether there's a way I can access the voltage reading ...
kabdulla's user avatar
  • 193
18 votes
1 answer
58k 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
  • 15.9k
11 votes
2 answers
24k views

What are the max current rating for 3.3v and 5v rail of the Rpi 4B

Does anybody know the max current rating of the 3.3v and 5 v rail of the new raspberry pi 4? i could not seem to find anybody benchmark this, i have read from someone that the new RPI 4 has a new ...
Jack's user avatar
  • 686
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
  • 99
8 votes
3 answers
10k views

Is it safe to power my external hard drive with a Raspberry Pi 3 B+ USB port?

I have a external hard drive that has written on it "5V ⎓ 1A". Both power and data transfer happen over a single USB. I have been reading about powering this hard drive with the USB ports on my ...
Eric's user avatar
  • 83
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
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
  • 60.3k
5 votes
2 answers
13k views

Is a 2.4 A 5V USB charging port enough to drive a Pi 3?

So its a qualcomm quickcharge enabled smartphone charging port. The recommended amperage for the pi3 is 2.5A, does the 0.1A make a difference? Also what is the difference between a charger and a ...
Strangeluv's user avatar
6 votes
3 answers
4k views

How to protect Raspberry Pi when powering via 5v pin?

I have reglaurly heard that while it is possible to power the Raspberry Pi via the 5v rail, you do so at your own risk. This is because the rail lacks any of the protections that the USB port has ...
SCB's user avatar
  • 195
4 votes
3 answers
9k views

Can I power Raspberry Pi (newer models) from 3.3v Supply Alone?

Many years ago, I've noticed that one without requirements of any 5V devices like USBs, he/she can completely bypass the power input circuit and the regulator. Feeding Pi Model A with power from v3.3 ...
比尔盖子's user avatar
4 votes
2 answers
8k views

Will an anker powerport+ work to power multiple pi's?

I'm not an electrical engineer so apologies for the rather basic question. I've found myself with multiple pi's and felt it was about time to look for some other power solutions other than powering ...
nbz's user avatar
  • 143
5 votes
2 answers
11k views

How Can My Raspberry Pi 3 B+ Power All My Devices?

I have a bunch of questions. I have searched LOTS but I can't seem to figure this out. I hope an expert can answer this for me. I read that a Raspberry Pi can only output 0.6A for those 4 USB ports in ...
May's user avatar
  • 105
2 votes
3 answers
11k views

Will 3.3v gpio work for a fan without hurting the pi?

Will it hurt the pi if I run a fan on the 3.3v gpio? I have a hdmi lcd screen on mine and I don't want to use the usb ports for a fan. I have a raspberry pi 3 by the way
kyran bullard's user avatar
5 votes
1 answer
10k views

RPi 3 blinking Red and Green light

I have a couple of RPI which I use regularly. Recently, I have been seeing Red and Green light blinking on my RPi. Rpi works great. I just couldn't understand why both the lights are blinking as it ...
dhruvvyas90's user avatar
  • 2,853
4 votes
1 answer
17k views

RPI3 USB port current?

I am using a RPI3 and have a GPS USB module and 3g USB dongle connected to the USB ports of the pi. I am using a 5 volts, 2.4 amps power supply. I was wondering if the RPI3 USB ports provide 1.2 Amps ...
bobdxcool's user avatar
  • 171
3 votes
3 answers
5k views

Bad to have undervoltage?

I constantly have the yellow light showing on the top right of the screen. Which means that the pi doesn't get enough power. I have a 5 volt and 2,1 amp adapter. Is this bad in anyway or could the pi ...
Wolle's user avatar
  • 31
9 votes
2 answers
5k views

How much power does a Raspberry Pi Need?

I have a Raspberry Pi 3 Model B and it seems like it's always low on power. You can see this by the lightning bolt on the top right corner. I started out by plugging the USB power into a 1A iPhone ...
Adam Oakley's user avatar
5 votes
1 answer
5k views

Monitor Raspberry pi undervoltage warning over time

I am looking to find a way to monitor the under-voltage warning over a longer period of time, preferably also what it currently reads as the voltage. The reason being I would like to fuse the data ...
BarrowWight's user avatar
0 votes
1 answer
14k views

The Pi Zero W has 5v and 3v rails. What is the max current per GPIO pin on the 5V rail?

What is the max current per GPIO pin on the 5V rail of the Pi Zero W? Also, can I power a 5V relay (4 channel, each requiring 15-20 mA) from this rail? If not, does anyone know of a 4 channel relay ...
holtc's user avatar
  • 103
2 votes
4 answers
7k views

Supply 3.3V via GPIO header (Pi3)

I need to power a Raspberry Pi 3 via its GPIO header: I have a beefy regulated PSU capable of providing stable 4.98V, which I planned to route to the 5V pins of the Raspberry as stated in this answer: ...
Francesco Bertolaccini's user avatar
2 votes
3 answers
7k views

Cannot find device can0 with MCP25625

I have been developing an expansion board for my RPi Zero, which contains a power supply based on the buck converter TPS62130 (5V/3A) by Texas Instruments, a USB Hub and a CAN Controller/Transceiver ...
eduardoSP's user avatar
1 vote
4 answers
4k views

Using single 5V relay module (jqc-3ff-s-z) - Asking for help

I have a developer background missing the electronics background. I read some threads with great interest: Using single 5V relay (jqc-3ff-s-z) - safety advice required and 5V relay (jqc-3ff-s-z) I ...
GuyH's user avatar
  • 21
2 votes
1 answer
6k views

Can I use my S7 edge charger for my Raspberry Pi 3 Model B?

I have no charger atm and I am a bit strict on money right now. Anyways, I have a spare Samsung charger and it has 2 values. 9V = 1.67A 5V = 2A It's a fast charger so I don't know what applies to ...
Clark's user avatar
  • 33
2 votes
2 answers
7k views

Is a red LED turn off during boot of RPi 3 a sign of problems?

I don't have much experience with Raspberry Pi. However, I've just noticed a difference in booting between Raspberry Pi 2 and 3, and so I've taken a couple of videos to show that. In both videos, the ...
user59894's user avatar
1 vote
2 answers
6k views

Can the 5V and 3.3V power pins be used to power multiple devices?

I am building a device that will be controlled by several digital encoders, all which are hooked up to the device's Raspberry Pi 3 model B. I know this may be a trivial question but bear with me as I ...
wlegra2's user avatar
  • 23
3 votes
3 answers
4k views

Low power warning using touch screen

I have a RPi 3 and a 7" touch screen, powered by a MW GS18E05 adapter. It says output 5-6V, 3.0-2.5A, max 15W. The top right corner yellow flash low power warning shows up when I boot and then it ...
Tomas By's user avatar
  • 218
0 votes
3 answers
6k views

Using a quickcharge power brick to run a Pi 3

I usually use my phone power brick (rated at 5v 2.5Amps) to run my Pi 3 and it works fine for the most part. Now I bought a new phone which supports something called fast charge. So the power brick ...
YaddyVirus's user avatar
1 vote
1 answer
6k views

Can I power a RPi 4 model B via a 5V/2A fast charging adapter?

It says 5V/3A in technical specs, I wonder if that 3 A is a must, or is there anybody who can power RPi 4 model B via a standard 5V / 2A smart phone adapter. Specifically, I would love to hear ...
muyustan's user avatar
  • 113
0 votes
1 answer
5k views

Best way to power Raspberry PI 3 via GPIO

I need to made device controlled with 3 Raspberry PI connected in cluster and want to made power supply via GPIO. Do I need made 3V3 and 5V supply or just 5V on GPIO2? Thanks.
Ivijan Stefan Stipić's user avatar
1 vote
1 answer
6k views

5V LED Strip Wiring Help for Raspberry Pi 3

I have a 5V LED strip that used to be behind a TV powered by its USB port - but it got mangled by the dog - and I can definitely use the scraps for a raspberry pi project. I have done my research ...
soulshined's user avatar
1 vote
2 answers
2k views

How to turn off relay when RPi shuts down

I have connected a relay to BCM 14 and by setting its output to HIGH I can turn it on, making a 220V bulb to turn on. I use for that the following python instructions: GPIO.setmode(GPIO.BCM) GPIO....
Ionică Bizău's user avatar
1 vote
1 answer
3k views

No effect when I set 'max_usb_current' in /boot/config.txt on a Raspberry Pi 3

I want recharge my iPhone from my Pi 3 Model B's USB port. In /boot/config.txt, I have set max_usb_current=1 This does not seem to have an effect any more. Why is this?
乐森林's user avatar
3 votes
3 answers
1k views

Can MAX98306 Stereo 3.7W Audio Amplifier be powered by Raspberry PI 5V supply?

Can I power the MAX98306 Stereo 3.7W Audio Amplifier off of my Raspberry Pi 3's 5V pin? I have a project that needs to be battery powered, and I'd like to run everything from a single battery and not ...
Alex's user avatar
  • 129
5 votes
2 answers
2k views

When to power GPIO projects from external power source?

I am working on a home automation project using: rPi 3 with 2.5 A power source 3 x MCP23017 for GPIO port expansion 3 x 8 ch solid state relay board by Sainsmart 20 x physical wall switch (future) ...
TheoryX's user avatar
  • 53
3 votes
2 answers
2k views

What is the minimum current value into the Pi's GPIO input?

What the minimum current input that must be provided to Pi's GPIO input in order to get high value? The idea: I will be adding Microwave Doppler which output are in micro amperes. I want to know if ...
Audrius Gailius's user avatar
4 votes
1 answer
2k views

Safe to power Raspberry Pi 3 with 5.25 v out of BEC?

So I'm using a Lipo to power my Pi 3 and to be safe, I installed a 5v 3A UBEC. Upon checking the voltage output, I saw the BEC was only stepping the voltage down to around 5.25v, rather than 5v. I ...
Rob Roberts 's user avatar
0 votes
4 answers
2k views

RPi undervoltage

I'm powering my Pi 3 with Weidmuller 5V/5A power supply and the Pi is running Raspbian Jessie. I have connected only a wireless mouse with wireless keyboard and USB web camera. I still get the yellow ...
Juraj's user avatar
  • 1
0 votes
3 answers
3k views

Powering RPI 3 and using relay from same source

I want to build something of a smart home device such as a smart switch /outlet for example that controls something like a light. However, I don't know what the wiring should be Like, if it's possible....
Muaaz Kasker's user avatar
1 vote
1 answer
3k views

Usage of external HDD, power consumption

I'm thinking in getting a RPi+USB HDD to make a server in my office, it would be working 24/7 and the primary usage would be to storage backups which would be automatically uploaded from different ...
Mc Kernel's user avatar
  • 133
1 vote
2 answers
2k views

Low Power when 7" touchscreen display connected

I recently won a raspberry pi, and decided to buy the Elecrow 7" touch and the 9 layer case for my raspberry pi. The case works great, and the fan runs without problems off of the 5v+ground GPIO pins. ...
Minebomber's user avatar

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