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

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Check if current if flowing through 220v ac wire

I want to add a third switch to a room with two existing switches. This third switch will be simulated by a 4 relays and a raspberry pi. Image source: wikipedia, Multiway_switching So 1 have one ...
2
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4answers
56 views

Using a power supply meant for driving LEDs for Raspberry Pi

I'm looking for a low cost high current power supply for a series of permanent installations with in there a Raspberry Pi 3, Teensy and 5V D-class audio amplifier. I found the Meanwell APV-16-5 (5v 2....
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1answer
61 views

Raspberry Pi 3 Reboot/Power issue

I'm having an issue with my Pi 3 regarding power/heat issues. I have a setup where a UBEC has been powering a Raspberry Pi 3, 5in HDMI touchscreen, and small fan for a project. It was running fine ...
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2answers
74 views

Power up from USB Cable or GPIO?

I have made a battery pack to power up my Raspberry Pi 3 for a project. The pack uses 2 Samsung ICR 18650 Li-Ion batteries (connected in series) and a 5V 3A UBEC and gives 5.05V output. Now I'm a ...
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1answer
46 views

RPi 3 Model B: PSU, Measuring Voltage & Amps

I cannot, for the life of me, get enough power into my pi so the mouse & keyboard are operable. I have a RPi approved usb hub (Belkin: Hi-Speed USB 2.0 7-Port Hub) powering the mouse and the ...
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2answers
41 views

Pi 2 rainbow square when external HDD is plugged

I have Pi 2 with Samsung (5V 2A) phone charger as its power supply. When USB external HDD is plugged, I got this small square with rainbow color on the right top of the screen. I looked around the ...
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3answers
93 views

Undervoltage warning despite decent power supply

I found some related questions about this, yet no answer. Using a freshly bought "5V/2.1A" rated power supply, I get undervoltage warning square on both my Raspberry3s. Although i measure 4.75V (at ...
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1answer
85 views

Connecting external Hard Drive to Raspberry Pi 2 [duplicate]

I am trying to connect a 2 Tb external Hard drive (ADATA HD710) to my raspberry pi, but the problem is that when I connect it to one of the USB ports, the raspberry pi stops working. I am not sure if ...
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5answers
122 views

Raspberry Pi 3 Power supply - chargers for mobile phone

I ordered new Raspberry Pi 3 for testing Win 10 IoT. Have a question about power supply. I have two chargers for mobile phone and which one do you recommend to use: Sony Xperia Z2 = 5v 1500mA ...
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1answer
39 views

Raspberry Pi not booting whn etxernal disk fails to mount via Fstab

I have a raspberry pi that has an external drive that mounts via fstab. Sometimes the pi refuses to boot when the external drive doesn't spin up fast enough (albeit the drive is quite old). Is there ...
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0answers
26 views

max_usb_current uneffective?

I found out that my raspberry freezes when having connected Huawei E3131 USB dongle... and the signal is really low. At first I thought that it may be connected to max current from USB... as specs say ...
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1answer
37 views

Power multiple sensors with external power source

I have quite a few sensors connected to my pi. pH sensor EC sensor 8 relay board some pwm outputs one-wire interface board from adafruit At the moment I power everything using the 5v and gnd pins ...
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2answers
38 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 ...
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1answer
35 views

Raspberry Pi model b+ has stopped working

I am using a Raspberry Pi model b+ to drive a wheelchair. I am running the motors through relay modules. The signal to the relay module is given from the Pi. Also a GSM module and voice recognition ...
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1answer
81 views

What happens if you try to power a Raspberry Pi 3 with a >=1A charger?

I don't have a raspberry pi 3, but noticed that it says it needs a 2.5A power. I have alot of the cheap <1A chargers at home. Can these power the raspberry pi 3? Also I guess I won't be able to ...
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1answer
60 views

Powering a Raspberry Pi from a vehicle battery 24/7

I am working on a project where my Pi is always connected to a vehicle to provide its GPS information. Seeing such a device must be always turned on, I am attempting to tap into a battery line that ...
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3answers
53 views

Multiport power supply for powering multiple Pi's

I would like to run about 4 or 5 Pi's at once and in searching the internet for a multiport power supply, what comes up is chargers. Does this semantic difference (power supply versus charger) matter ...
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71 views

Raspberry pi 3 power supply and HDMI

I have a small robot centered around the Raspberry pi 2 driving through a DFRobot Romeo (aka Arduino). When developing I have been drawing power from the USB connections on both the Arduino and ...
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2answers
40 views

Raspberry Pi Power usage monitoring

How can I assess whether my power source is sufficient for the Raspberry Pi 3 I am running (including all peripherals)? Is there a tool which can be installed on the Pi to install this or will ...
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1answer
82 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 ...
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2answers
109 views

Can I power a RPi3 from its USB ports?

https://www.raspberrypi.org/help/faqs/#powerHub indicates that certain USB hubs can "backpower" the the Raspberry Pi by its USB ports. Apart from the fact that it seems to bypass the overvoltage ...
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1answer
41 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 ...
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1answer
46 views

Despite having powered USB Hub, Raspberry Pi 2+ doesn't detect Seagate 1TB HDD anymore

I'm trying to set up a raspberry pi 2+ as an always on torrent box. I had it set up one time and it was working, but then when I turned it off and on again it froze on start up. After flashing the ...
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1answer
79 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. ...
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1answer
62 views

Powering up a WS2812 led strip with different power supplies

I have a Pi powered with its own adapter. I bought a 1 meter ws2812 led strip and bought a separate power supply for it (5V 6A). I plan to plug the +5V of the power supply directly to the +5V section ...
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1answer
20 views

Can I use a SMPS for powering pi and sensors connected to it [duplicate]

BME280, BMA180 and BMP180 are the sensors that I am going to connect with pi via I2C. Can I use SMPS for powering both pi and sensors (as a common power source). If yes, how can it be done? voltage ...
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0answers
31 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 ...
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3answers
244 views

I want to use a common power supply to pi and sensors BME280 and BMA180 (sensor modules). Is it possible?

How can I accommodate between the difference in voltage and current levels with a single power source?
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1answer
57 views

touch screen not working

I just bought a touch screen ,First it Works fine, but after two weeks the screen and the LEDs blink, and if I connect my Pi 2 via HDMI, it doesn't work at all. I connect the USB of my PC to supply ...
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1answer
55 views

Amazon Basics Powered USB Hub not Powering Pi 2

So I bought an Amazon Basics powered USB 3.0 hub for my pi model 2. It works perfectly fine for powering peripherals and data transfer works just fine when my pi is powered off of a separate power ...
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3answers
137 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 ...
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1answer
33 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 ...
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179 views

What could be causing “over-current change” all the sudden?

This is a Raspberry Pi 2 using a 5V 2 Amp power supply running with a LaCie 2TB USB external drive connected via the USB port. It gets its power from the USB port for the drive. The above has been ...
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0answers
39 views

Powering with USB 3.0 from FritzBox 7490

someone gifted me an Rπ B+ recently. I've always powered it with an external 2A PSU. Im using my Rπ without any other peripherals like other USB-Devices or Displays. It's just a GIT/SVN/Minecraft-...
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18 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 ...
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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 ...
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2answers
27k 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 ...
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2answers
156 views

How likely is SD card corruption?

I was working on my Pi and accidentally disconnected it from power. I have read that disconnecting power while the SD card is being written to can cause SD card corruption. How often does that really ...
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4answers
646 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 ...
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2answers
62 views

Ethernet not working because of power supply wire length

I use a 5V 2A charger for my Raspberry Pi. If I use a short (50 cm long) wire everything works fine. When I use a long (280 cm) wire, the lights from the board are turned off (thus the cable is not ...
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2answers
343 views

Automatic shutdown of Pi Zero on low battery

I am trying to build a battery powered Pi Zero, using a LiPo battery and the Adafruit Powerboost 500. I would like to be able to use the low battery output (LBO) on the powerboost to tell the Pi to ...
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1answer
36 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) ...
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1answer
117 views

Raspberry Pi sudden shutdown, excessive heat

I have a Raspberry Pi model 2 B with Raspbian. When I plug in the power source, only the Green LED blinks, no Red LED. The OS successfully boots and I can use the Raspberry perfectly. As soon as the ...
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2answers
494 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 ...
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2answers
126 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? ...
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1answer
70 views

Pi 2 Question about power

I currently own a "WD My Passport Ultra 2 TB", It needs 500 mA to run. I only have a usb adapter that supplies my pi (2 b) with 1A. Would getting a better adapter allow me to power the 2TB drive? If ...
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2answers
91 views

Can I use the USB Hub to power the Raspberry Pi Zero?

I have this hub, with the Pi Zero: I know that I need to power the Pi via the USB power port and that the Hub is powered a separate power supply; provided when you purchase it. But I'd rather ...
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2answers
66 views

Are there any battery packs than can act as a UPS? [closed]

I have an external battery pack, for my phone - it charges via USB. I was thinking I could use it to power my new Pi Zero - if the power goes out - but I realised the one I have cannot be charged and ...
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4answers
317 views

Red LED after `sudo halt`, may I unplug?

I flashed Raspbian and I use my Pi headless, connecting via SSH. To power it off I do sudo halt, which disconnects me from the SSH. After a few green led blips I have steady red led on. Does it mean ...
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2answers
202 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. The problem is, the only power source of such hard drive is the USB port it is connected to. In short: They would ...