Linked Questions

82 votes
2 answers
121k views

Raspberry Pi Power Limitations

There are very many, often contradictory, claims about the power requirements and limitations of the Pi. What are the exact requirements?
Milliways's user avatar
  • 59.6k
19 votes
3 answers
24k views

Is it possible to detect input voltage using only software?

I'm a newbie to Raspberry Pi's, but one of the things I was thinking about doing is running it off batteries (I see many people do this) - that led me to concerns about shutting down gracefully. Is ...
Aerik's user avatar
  • 293
9 votes
3 answers
39k 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
56k 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
  • 15.8k
1 vote
4 answers
2k views

Low voltage warning powering Raspberry by means of power bank

I'm trying to power my Raspberry 3 model B by means a Catlyn Power Bank 10000mah just purchased and seems to work fine with an iPhone 11. The problem is that when I connect it to Raspberry, even if ...
M4Biz's user avatar
  • 129
-2 votes
2 answers
7k views

How to develop a Plugin to read the status of the Power-LED of the Raspberry Pi 3 B by PHP [closed]

I need to develop a plugin that reads the status of the Power-LED of the Raspberry Pi 3 B and print the status of the LED on the Web-page. Please Help !!!
Mohammad Mbydeen's user avatar
1 vote
2 answers
4k views

Max networking performance with RPi 4 (Gigabit ethernet), with/without a USB3 external disk connected

I want to use my RPi4 as a small home NAS. To do that, I'm trying to benchmark the maximum file transfer performance. Workflow: Rpi4 connected to home router with a 1 Gbit cable computer connected ...
Basj's user avatar
  • 782
3 votes
3 answers
1k views

Freenove 4WD car with Raspberry 4 won’t boot up from batteries but will when plugged in

We have been building the 4WD Freenove car with a Raspberry Pi 4. We purchased two Samsung 18650 batteries. When we try boot up from battery power the red LED turns on the Pi. However the green ACT ...
Saul's user avatar
  • 31
0 votes
2 answers
2k views

Can I power a Raspberry Pi 400 with a 5V 2.5A power supply?

I have Raspberry Pi 3 B+,and I'm considering upgrading to a Raspberry Pi 400. I understand that it is recommended to use a 5.1V 3A power supply, but can I use the 5V 2.5A supply I already have?
Robert's user avatar
  • 1
0 votes
1 answer
948 views

Strange voltage on 3.3V pins

I have bought a new Raspberry Pi 4 and while troubleshooting connection to a DAC module I measured the voltage at 3.3V power pins. With reference to the pin header number as shown on the diagram below,...
Zaffresky's user avatar
0 votes
2 answers
339 views

Low power warning when using pi with touchscreen

I’m using a raspberry pi 3B with this DSI touch screen from waveshare. As a power source I’m using this battery hat, which according to the documents should provide 5V. The battery is also fully ...
Alexander Hörl's user avatar
0 votes
2 answers
299 views

Raspberry PI4 + Coral TPU + Telit LTE get "Under-Voltage"

I am using a Raspberry PI4 powered by the Raspberry power supply(5.1V,3A) and I have also a Coral TPU and a Telit Lte Modem attached on Raspberry USB 3.0 Ports Hub. According with the Coral Power ...
Andrea Lancioni's user avatar
1 vote
3 answers
199 views

Stop docker container on unmount

I'm trying to debug something that I don't quite understand well. I have setup an automount of an external drive with: /etc/fstab UUID={RANDOM_UUID} /media/pi/Storage ext4 defaults,nofail,x-systemd....
German Casares's user avatar
2 votes
0 answers
155 views

Pi cannot boot when encrypted USB SSD drive is attached

I have a Pi 4, running Raspbian 10 Buster. I have an attached SSD drive with LUKS encryption. When I restart the Pi, it wouldn't boot if the SSD is attached. Once I unplug it, it boots well and I can ...
Ryan's user avatar
  • 21
2 votes
1 answer
77 views

Raspberry Pi undervoltage strange issues

So I have an old Rpi2 B, and I was getting an undervoltage error trying to run OctoPrint on an old bundled PSU. I swapped for a 5V/4A PSU with the same error, I only have the power supply and an ...
Josh's user avatar
  • 21