Questions tagged [power-supply]

The methods for powering the Raspberry Pi (typically via its micro-USB connection.)

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2answers
1k 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) ...
0
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1answer
403 views

What is it about the redesign of the new Pi 3 B+ power supply that's discussed here? [closed]

Today's announcement at raspberrypi.org: Raspberry Pi 3 Model B+ On Sale Now at $35 describes several improvements. In the linked YouTube video changes to the power supply are discussed between 04:30 ...
1
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1answer
43 views

Pi and h-bridge power issue

I am following this tutorial in my attempt to create my first Pi based robot. I am using a Pi 3 model B and I believe I have things wired up correctly however while the H-Bridge is powered up, the Pi ...
29
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5answers
29k views

Circuit to safely power-down Pi

I want to use my Pi as an XBMC server in the car. The XBMC docs say that you should always use the shutdown command before disconnecting the power. I've been thinking that it should be possible to ...
0
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0answers
691 views

Disable Power Over HDMI

I built a Retropie using a PI Model 3B that is powered via the GPIO pins. Specifically with this case which adapts micro usb to the GPIO power. Everything works fine except when I turn the system off. ...
0
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2answers
753 views

Powering Raspberry PI Zero W using IC 7805 Voltage Regulator

I want to know if its possible to power PI zero w using 7805 voltage regulator. Max current rating of 7805 is 1A. What is the max consumption of PI zero W? Would it require more than 1A of current? I ...
0
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1answer
301 views

False-positive button press on power interference

I'm having a rather funny issue with GPIO & tactile switch. The issue is as I understand purely electric. My RPi is connected to a cheap usb "Extreme Style 5V 3.1A" PSU. Same power outlet is ...
-2
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2answers
76 views

Why RPI need such a high current?

I am little bit confused. All my colleagues tell me that I need 2.5 or 3A power source. Indeed, it does not work with with "smaller" source. However, the general knowledge and this site (and many ...
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2answers
447 views

Pi keeps turning on and off when I have a number of USB devices

So I have a Raspberry Pi B+ - I've had it for several years now, which I think may be the cause of this problem, though I'm not sure how. Basically, it's fine when I have just a keyboard plugged in, ...
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2answers
175 views

Multiple problems with my Raspberry Pi 3

I am not new to the Pi 3 and now have it for quite a few months now. However, I started to face multiple problems: My pi 3 would shut down and restart when I was working on it. At a time, only the ...
1
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1answer
1k views

dtoverlay=gpio-poweroff not working on raspberry pi 3 B

Problem: I have a Raspi 3B rev: a02082 (Q1 2016 3 Model B 1.2 1 GB (Mfg by Sony)) running raspbian jessie kernel 4.9.35-v7 I want to signal to a power management circuit that filesystems ...
4
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3answers
2k views

rPi2 model B v1.1 smoke comes out near power port

I am trying to control 2 motors using the E-gizmo Motor driver shield but suddenly smoke comes out near the power port of the raspberry pi 2 so I immediately unplugged the power supply. After that, I ...
2
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1answer
1k views

Moto Turbo Charger for Raspberry PI 3 Model B

I have recently brought Raspberry PI 3 Model B, however still don't have power supply which give output as 5V and 2A min. Moto Turbo Charger output read as Standard - 5V/2.85A Turbo1 -9V/2.85A ...
1
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1answer
92 views

With the Pi Zero W plus a 2.4A adapter, can I safely draw up to 2A from the 5V pin?

Since the Zero W doesn't have a polyfuse, am I right in assuming that the 5V pin can safely supply whatever current the power supply puts out minus the draw from the Zero W board itself (and any ...
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3answers
15k views

Can I power a Pi through a 5V pin?

The PIN mapping of the Raspberry 2B says: The red ones are 5V pins. Are these just used as 5V out pins when power is connected through Micro USB? Or is it also possible to power the Raspberry Pi via ...
3
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3answers
2k 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 ...
0
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1answer
167 views

5.6V with official touchscreen [closed]

As I mentioned earlier I am getting low power warnings with a 5V adapter, and have now obtained another one that says 5.6V. Am wondering if this might work, or if it will damage the Pi and/or the ...
0
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0answers
234 views

Using Raspberry Pi with Powerbank Accumulator

I wanted to power my Raspberry Pi 3B plus some sensors and an additional Huawei modem with a Powerbank. When turned on that's no problem, everything works fine. But I want to measure some enviromental ...
0
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1answer
53 views

Boot only with usb cable energy

My raspberry worked fine with a 5V-2A charger. From few days, It boots only with the energy coming from the USB cable from my computer. If I use the usual charger, it goes in a boot loop, displaying ...
3
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1answer
177 views

Is the power decoupling inadequate?

I hooked up one of these LCDs and noticed that the backlight flickers a lot when powered by the 5V from the GPIO port. The backlight uses ~100mA and the RPi was using just ~200mA. The flickering is ...
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0answers
33 views

Power Draw Requirements for multiple components and PI

I am building a rover, that ideally I would like to power from a single 12V Marine Battery. The battery provides power to all the components: Pi3 through a Power Converter 12V LED computer monitor, ...
2
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1answer
41 views

How can I limit the power from a battery for my RPi3? [closed]

I am taking an old HP G62-407DX apart, and I have replaced the motherboard with a raspberry pi. With some help on Superuser, I figured out what the display used. Now, I would like to know how to limit ...
3
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1answer
199 views

Can someone explain what backfeeding is and how I can protect my Pi from it?

So I read something about "backfeeding" and that it can damage my Pi. What exactly is it? I didn't understand the article. BTW, I'm a complete noob so please try to be as un-technical as possible. I'...
31
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6answers
91k views

Powering a PI from 12V

I'm thinking of installing my Pi down at my wife's stables which have a 40W solar charged 12V DC lighting circuit. Since the Pi runs at 5V I'm thinking that a quick and easy way to step down the ...
5
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1answer
4k views

Powering Raspberry PI With Broken Micro USB Connector

The Micro-USB port has been brutally ripped off from the PCB on my Raspberry Pi along with traces connecting it. I know that I can power the device from GPIO 5V and GND, but there will be no ...
13
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4answers
12k views

Can I use a standard PC power supply to power a Raspberry Pi?

Can I use a standard PC power supply to power a Raspberry Pi, e.g. iMicro IM400W 400W ATX12V Power Supply (or just take one from an old unused computer)? Amazingly, these things are sold starting from ...
1
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1answer
315 views

Power Supply for Raspberry Pi Model b [duplicate]

I recently bought a Raspberry Pi 3 and forgot to buy the power supply. Could I use a phone charger (1.5v, 0.75amp) to power the Raspberry Pi 3?
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3answers
1k views

Will a power bank short circuit a raspberry pi?

I was wondering if I could make my raspberry pi portable with a power bank however, I think it might short circuit the motherboard and then that would mean bye bye raspberry pi. Is it save to use my ...
7
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1answer
6k views

How to make a simple, reliable 15-second UPS for shutdown?

Use case: On power loss, the pi is to gracefully close all I/O (already kept to a minimum) and shut down, to be manually rebooted later. A supercapacitor works (I think; not sure of voltage near the ...
3
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3answers
4k views

How to control a 3V laser from GPIO

What's the best way to control (turn on and off) a low-power 35mA 3V laser from a Raspberry PI GPIO pin? The RPi GPIO pins support the right voltage but each can supply only a maximum of about 16mA, ...
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0answers
37 views

2 Raspberry Pis 1 Battery

I'm working on a project, here's the deal... I have 2 raspberry pis (3B, and a zero w) and 1 battery (3.7V LiIon 1200mAh). I bought a PowerBoost 1000 (A "DC/DC boost converter module can be powered by ...
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0answers
26 views

Question about Power supply for Raspberry Pi Zero W V1.1 [duplicate]

I recently got a Raspberry Pi Zero W V1.1 as a gift....and I'm a bit confused about the power requirements for it. I have a 5V~2A mobile-charger and a 5V~1A mobile charger. Can I use any one of the ...
0
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0answers
81 views

Accidentally fed 12V to the 5V-pin of Rpi2 [duplicate]

After it happened, smoke comes out near the micro USB port of the rpi. I replugged the power supply of he rpi but this time, the power LED(red) doesn't turn ON while the green LED keeps on blinking. ...
0
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1answer
88 views

Uninterrupted Power Supply needed for Raspberry Pi

We have designed multiple temperature sensors. its executed as well too. but we need external power supply or Uninterrupted Power supply for Rpi. I have chosen power bank ..but it works with only one ...
1
vote
1answer
104 views

Monitor misbehaving with stock power supply [closed]

I just bought a Raspberry Pi 3, bundled with the stock power adapter. When I use this power supply, the computer monitor I've connected to the Pi through HDMI is constantly turning on and off in a ...
23
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5answers
2k views

What do I need to know when choosing a dedicated power supply?

This question asks about what you'd need to know to power a Pi from a non-dedicated power source. It also links to the Quick Start Guide, which says: Micro USB power supply – make sure you use a ...
1
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1answer
50 views

RCB trip / switch-on can cause Pi to brick?

I have a Pi which is powered by a (official) Pi Power Adaptor (from Amazon). A few days ago, an electrician working in my hose switched off (by accident) and turned an RCB back on. I believe that ...
0
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0answers
239 views

How to determine if a USB power supply is safe to use with a Raspberry Pi?

I have a Raspberry Pi 3 that appears to have been destroyed this morning. I purchased a no-brand USB mains charger suitable for UK use (and CE certified) from eBay, and I am almost certain that was ...
0
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4answers
110 views

Phone power pack for Pi

Is it a bad idea to power a Pi 2,3, or zero from a mobile phone power pack? I understand that Pi power consumption is as follows, *** Idle *** Raspberry Pi 2 B: 420mA Raspberry Pi B+: 230-240mA ...
1
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2answers
994 views

Power Raspberry Pi using two 3.7v Lipo batteries

I was having trouble while booting up my Raspberry Pi powered by LiPo batteries. Ignore the components inside the blue circle I am just connecting the batteries, the darlington transistor and the ...
2
votes
1answer
130 views

I cannot run rpi 3 from 8 battery (14500)

I cannot run rpi 3 from 8 battery (14500) Series circuits 29.6v. I am convert 29.6v through dc-dc converter (XL4005 DSN5000) to 5v. The converter output can be 5A. But I cannot take more than 0.5A ...
0
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1answer
137 views

Powering the PI over micro USB with a dumb (PC) power supply?

This is related to some existing questions (eg Powering without using the micro USB), but they don't make clear one specific part. I want to power a Pi from a PC power supply's 5v rail, but I'll do so ...
1
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1answer
210 views

Creating a timelapse camera system in the Arctic using a Pi Zero

I am pretty much a total beginner when it comes to Raspberry Pi's and everything associated. Thus, I am relying on the people in this Forum to help me out:) I have a project in Greenland for which I ...
1
vote
3answers
4k 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: ...
1
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1answer
68 views

Power required to run multiple appliances at once

I have an electronics question. I am no electrician and am trying to build an alarm pi Mark2. Currently I have a 12v power supply running through a relay which the pi turns on and off to trigger my ...
0
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1answer
81 views

Can a smartphone acts as a power supply to a Model 1A?

I have the following USB MicroB-to-A cable that I use for charging my phone (Samsung Galaxy S7 Edge): I'm wondering if I can power my Raspberry Pi 1 Model A with my phone?! The USB-MicroB end would ...
0
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1answer
67 views

How to power an RPi Model 1A with my Mac?

I have a MacBook Pro and a Raspberry Pi 1 Model A. I'm just trying to power the RPi (I need a power source). I've searched hi and low, and the best/easiest solution seems to be finding a USB A male-to-...
1
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1answer
732 views

Raspberry Pi not booting up over USB power supply

I am doing some stuff with Raspberry Pi. I have successfully burn my OS on SD card. I am able to boot up the system when I provide power with charging adapter. But when I powered up with my laptop USB ...
0
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2answers
2k views

Can I use a Y-cable or Dual-Power cable to get additional power for a single USB powered hard drive?

I'm planning to attach multiple portable 2.5" hard drives to a Raspberry Pi 2 Model B. These hard drives are powered each by a single USB cable, which is a problem, because the Pi does not provide ...
4
votes
1answer
1k 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 ...