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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36 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
14 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 ...
7
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5answers
1k 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
55 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 ...
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0answers
14 views

Power usage of a rpi a? [duplicate]

How much energy does the raspberry pi model "a" use in 24 hours with nothing attached? Also, how does it compare to the model "a+"'s energy use and the model "b+"'s energy use in the same condition? ...
4
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1answer
73 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 ...
4
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2answers
312 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 ...
12
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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
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1answer
30 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 ...
0
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1answer
43 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
53 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 ...
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2answers
42 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
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0answers
49 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
28 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
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2answers
46 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
28 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
38 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
218 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
49 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
35 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
31 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.
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0answers
15 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 ...
1
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1answer
31 views

Connecting a 16-channel relay to my Pi

I have a B+ Pi that was purchased for use as a Christmas light controller. I wired the GPIO pins from the pin to the 16 channel Sainsmart relay successfully, and was able activate the switches. ...
1
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1answer
42 views

dual usb power supply for 2 rpi

i'm working on a double solution in my one with 2 rpi one is for the domotic part (a rpi 1b+ with ethernet and wifi dongle, no usb device or hdmi display for now) and one as mediacenter (a rpi 2b with ...
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3answers
81 views

USB Hub to power 8 Pis

Would this USB hub work to power 8 Pi 3's? If not... What are clean powering options for a cluster of 8?
0
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1answer
37 views

Python script stopped writing to file overtime

I have a simple Python script which is designed to record the uptime of the Raspberry Pi while it is being powered by batteries. Every Minute it writes the time to a file. Ideally, the script will Run ...
0
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1answer
43 views

GPIO output working, but not?

Sorry for the confusing title, but here's my problem: I'm trying to test out a 2N2222 transistor as a switch for a higher current (for a 4WD motor) with the Raspberry Pi B+, and I'm trying to use one ...
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1answer
68 views

What areas of the Raspberry Pi are useful to analyze with an oscilloscope?

I am already aware of the great usefulness of a logic analyzer to troubleshoot digital signal processing. But what about an oscilloscope for the analog stuff? Which, if any, components or junctions ...
1
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1answer
466 views

Current concerns regarding Raspberry Pi

After doing some research on Internet, I realized that maximum current draw for all pins combined in Raspberry Pi 3 is pathetic 50 mA. (BTW, in case of Arduino 101 "...maximum current draw is 1500 ...
2
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1answer
88 views

What is the power supply protection on the Raspberry Pi 3? [duplicate]

The previous RPi2 model has a 2A polyfuse after the power input. The RPi3 now takes a USB power adapter up to 2.5A ( indicated as 2.4A in some references ). Did they keep the polyfuse and increase ...
0
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1answer
73 views

Can my pi 3 be damaged by cutting the power suddenly?

I accidentally switched my pi 3 off and on again a few times directly after each (few secs) other by pulling the plug a few times. :/ Can my pi be damaged by this? Everything seems to be working ...
3
votes
1answer
160 views

Max current from 3.3v power pins (for RPi model B+) - Higher Than You Were Told!

There are many references to a max limit of 50ma when sourcing power from the two 3.3v power pins on the GPIO (just for clarity, I am NOT referring to the I/O pins). However, I suspect this current ...
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3answers
110 views

Can This UPS(UNINTERRUPTIBLE POWER SUPPLY) Run a Raspberry Pi for 24hours?

I am setting up an experiment that will need to run for 15 days straight and I am using a Raspberry Pi as a data logger. In my place power outages occurs from time to time. I am searching for cheap ...
0
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1answer
31 views

PWR LED is off for a specific power supply but everything works fine. Does this indicate a problem?

For my Raspberry Pi B+, I have a 5V 5A adapter.For the adapter though I had to cut and connnect a micro usb cable (to power input of RPi) and another cable to the power outlet (kind of and industrial ...
0
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2answers
81 views

What is the maximum number of modules I can connect to Raspberry Pi 2

I am starting a pet project that involves Raspberry Pi 2 and I was wondering. What is the maximum amount of GPIO modules I can connect to a Raspberry Pi 2? I Basically my question does not involve ...
0
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0answers
16 views

RPi and HDMI HML powering

What happens if an RPi is connected to a HDMI HML device that delivers power. Is it designed to handle that safely? Does it depend of the model? And what if the power that is provided by HDMI is ...
1
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1answer
1k 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 ...
13
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1answer
16k 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 ...
3
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2answers
65 views

Why my HDMI->DVI converter works only when powered from PC?

So, I have a Raspberry PI B+. It has HDMI video output. Since the only device in my house that has HDMI input is the TV, which is in another room and is usually occupied by my wife, and as my monitor ...
2
votes
4answers
580 views

Raspberry Pi 2 - power circuit

I'm currently designing a PCB with some fets, logic level shifting and RS-232 connectors, to use with my Raspberry Pi 2. Now I thought, I could add a (around) 24v to 5v supply circuit, to directly ...
0
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0answers
23 views

Two Tinkerforge Masterbricks

I have two raspberries and two Tinkerforge Master bricks. I want to stack the bricks and then connect each raspberry to a brick. However, when testing just adding one raspberry to the double stack, ...
3
votes
1answer
81 views

Pi2 does not power up. Is there anything I can do?

I finally started putting an auto-plant-watering system together, trying to develop the entire system using Win10 IoT, VS 2015, and c#. I'm at the very beginning stages of development but I did get ...
15
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4answers
2k 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 ...
0
votes
1answer
31 views

High amperage power supply/powered hub [closed]

I want to build a media center and I have got all I need except a power supply/hub to run it. My components are: RPi 2 B (FAQ says 1.8A) External HDD (up to 1A as it is attached via 2 USB ports) ...
5
votes
2answers
66 views

Can pulling the power cause any problem *except* with the SD card contents?

If we assume a stable system, not connected to any network, and fully backed up, what damage can cutting the power do? Obviously it's a hassle to restore an image of the card, but a fairly minor ...
3
votes
2answers
466 views

Is there a max current that can be supplied when powering the Pi from the pins?

I want to power my Pi Zero from the header pins, pin 2 and pin 6 specifically. I know that my Pi Zero can consume up to 120mA, and my power supply can provide up to 500mA. I've heard that the 3.3v ...
1
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1answer
103 views

PI2B safe shutdown procedure on low battery and auto start

I have a RPI2B controlling a mobile CCTV setup. System runs on 12V (solar panels + batteries) with a low voltage disconnect (LVD) and PI powered by a buck step-down converter. RPI drives a relay via ...
0
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3answers
118 views

Correct wiring for 433MHz transmitter/receivers?

I have ordered some of these commonly used 433MHz transmitter/receiver units with the intention of using my Pi GPIO pins to send and receive radio signals. I have my approach mostly figured out, but ...
6
votes
2answers
322 views

Can I power a 3V water pump using the 3V3 pin?

Zero experience here. Would it be possible to connect a simple water pump that requires 3V to the 3V3 pin of the RPI? And in case the answer is no: Why not? What other power source would then be the ...
3
votes
2answers
92 views

Does it matter which pins are used when powering the Pi from the header?

If you didn't already know, you can power the Pi from the GPIO pins. By supplying pin 2 with 5v and connecting a ground to pin 6, you can power the Pi. My question; does it matter which pins are used? ...