Questions tagged [power-supply]

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

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205 views

Raspberry Pi only red power light after sometime?

While running raspberry Pi 2 for long, there often happen to be some power fluctuations that cause only red light to be turned on and the system not working until I turn off and on the power supply to ...
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410 views

Measure input voltage of Raspberry Pi B+ running Ubuntu

I just learned that a red flashing LED indicates voltage below 4.63V on a Raspberry Pi Model B+. Thus, the Pi seems to "know" about it's input voltage. So my question is: Is there a command to ...
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967 views

How to detect, if something is not working properly?

I've bought a Raspberry PI 2 a month ago. Everything worked fine. I've reinstalled it sometimes. But I've noticed that now it's slower than before, and freezes more often. Is it a program, using I ...
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How can I replace “Wireless Remote Control Switch” with Raspberry Pi?

I am looking for a solution where I can control a "8 Channel Relay" (Link: http://www.amazon.in/channel-control-optocoupler-ARDUINO-Raspberry/dp/B00YY0SYFU?tag=googinhydr18418-21) wirelessly by using ...
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1answer
164 views

Pi not recognizing USB ports with an adequate PSU

So I got the Raspberry Pi B+ about 3 weeks ago and it hasn't been functioning 100% correctly... I have a PiHub to power my ehdd (1tb WD Elements), Wifi Adapter Realtek 8188CU, and (usually) the ...
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4answers
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Powering Pi with a 5V regulated power supply

I am considering this 5V regulated PS module. I have a coin acceptor that connects to a board. I am going to cut the coin acceptors 12V cable and put the -ve and +ve behind the regulated power supply ...
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1answer
698 views

Pi dead: U3 IC gets extremely hot

I got two Pi's, and both of them have the same problem. To the first one, I connected a 3.3V power supply to pin 1, following which the board didn't boot and no LEDs lit. The board seems to be dead, ...
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4answers
5k views

Power supply for Raspberry Pi 2 Model B

I have Raspberry Pi 2 Model B and two USB power adaptors with specs: Apple charger: 12W 5.2V 2.4A Samsung (came with galaxy S6): 9V 1.67A or 5V 2.0A It is stated that my Raspberry would need 1.8A ...
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764 views

Tapping into 5v power

I will be using a high-amp 5v power supply feeding the Raspberry Pi 2 via microusb. (Similar to this http://www.dx.com/p/dc-6v-24v-to-usb-dc-5v-3a-regulated-power-supply-module-black-314056 one) I ...
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6k views

What power supply should be used for the B+ model?

I'm thinking about purchasing a Raspberry Pi B+ model, and the Raspberry Pi website states that the power supply should output 2 A through a micro- USB supply. OK, but in terms of voltage, what ...
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1k views

Increase raspberry pi voltage

Say I bought you a RC car as a gift, that works on 24v battery. You decided that RC car is boring and want to control it with raspberry pi 2. There are two motors on the car. You bought a voltage ...
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3answers
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Can I power a USB SSD/HDD?

I read the power supply should have 0.7A and that RPi by itself requires around 0.4A-0.5A. So, what if I want to connect an external USB SSD/HDD? External SSD can require 0.5A (and maybe more), so ...
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1answer
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What type of micro-USB is used?

From previous experience I've discovered there are quite a few different types of micro-USB connectors. Here are three main ones: I'm pretty sure it's not the middle one; and I think it's the left ...
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59 views

Motors have stopped working

I was building a model car, and had 4 motors connected to a h bridge. Everything was working exactly as planned, the car was fully operational, but after a day I ran the program again and some of the ...
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1answer
4k views

Controlling Servos with a Raspberry Pi

I am not sure if this will break my Pi, so I decided to double check In this image is a simple servo connection, I am still learning how servos work. I actually have two questions: If I decided to ...
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5answers
2k views

Strategies to deal with unpredictable power supply

I want to install a Pi in my car and use it to record GPS data. What strategies (in my program) can I follow to minimize problems due to power being interrupted when writing to the SD card? So far I ...
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2answers
5k views

Is it possible to power a model B+ via the 5v pins on the GPIO header? [duplicate]

I'm making a powered daughter board to mount my B+ Pi on. Can I power the Pi entirely through the 5v pins on the GPIO header? More importantly, can I also supply reasonable currents to USB devices ...
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86 views

Raspberry dead?

IN order to change the circuit, I unplugged the pi. Now when I plug it again (through micro USB), I've no lights at all. I tried with several power supply, which work with my phone. Also I see ...
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3answers
9k views

What's the problem with backfeeding?

New to the Pi, so new in fact that my very first (a B+) hasn't even arrived in the mail yet... I know that "backfeeding" or "backpowering" refers to powering the Raspberry Pi via a powered USB hub ...
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255 views

Reboot after some times a GPIO output is on

I'm using a raspberry PI B+ to drive a relay via a BJT transistor. The GPIO pin source about 8ma ( calculated, since it is driving a 600 ohm load ) so when the I/O is on there should not be a too ...
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1answer
6k views

My Pi2 won't boot. How do I check\measure the voltage on a Pi2

So my Pi is giving me the red light of doom and I want to check to see if the power supply is faulty. How do I measure the voltage on the Pi2 from the power supply to ensure it is not faulty?
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RPI 2 B freezes when Wi-Fi dongle is inserted and doesn't detect it

I have an RPI Model 2B running Raspbian that works (almost) perfectly. I recently bought a TP-LINK WN725N V2.0 that I thought would work if I followed the instructions listed here. However, when I ...
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4answers
1k views

When is it safe to switch power off after halting Pi

When is it safe to switch off the power supply to the pi after it was halted? I am using ssh to access my Pi (runs Raspbian), and sudo poweroff to shut it down (the wifi dongle keeps blinking for a ...
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3answers
7k views

What is the best power supply for the Raspberry Pi B+?

I have read through the question What power supply should be used for the B+ model? to find the best power supply for the B+. I have read that if you are connecting additional things to the Raspberry ...
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4answers
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What to do about all the wall warts (AC/DC Adaptor bricks)?

While having nice little single-purpose machines is great, I have a proliferation of wall warts now which is becoming untenable. Between a router and an ethernet switch and a HDMI switch and a USB ...
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1answer
2k views

Using a power supply to power Pi and Pump

I asked a questions about controlling a water pump with the pi and in one of the answers (https://raspberrypi.stackexchange.com/a/32014/19436) he mentioned I could get one power supply to power both ...
2
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1answer
4k views

Wire 5v to raspberry pi b+ without microUsb

On the original model b it was possible to wire power to the tp1 and tp2 (which ran through the fuse and was protected?) I am upgrading my 3d printer to run with a b+ but the b+ does not have the same ...
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1answer
131 views

Raspbian lxde desktop misbehaving

Installed raspbian on 8gb miroSD card booted with 5v and 0.7A power supply, rpi boots well and works. when i pluged in an headphone, the cursor freezed. I restarted and everything worked well and when ...
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123 views

Raspberry power supply via PoE (power over ethernet) [duplicate]

Is it possible to supply a raspberry pi via PoE? If not, why?
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1answer
563 views

How do I interpret the Volts and Amps on my Raspberry Pi Power Adapter?

I have a Raspberry Pi 1 Model B. I have now bought the Power Adapter so I can finally start using it. But I am wondering how to interpret the information written on my power supply. The Power Supply ...
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1answer
689 views

How to measure Power Supply without Extra Hardware on B+ and RPi 2

As shown in this question, for the Raspberry Pi model B, in order to measure the voltage you just connect a multimeter to the TP1 and 2 pads. How is this done on the Raspberry Pi model B+ and 2 which ...
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1answer
153 views

Housing and temperature

I'm creating a cute wooden box for my pi as XBMC + webServer. As I want the system to stop using energy when switched off I included the 5v 1a transformer in the case, and put the switch between the ...
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1answer
843 views

My Pi getting heated for no reason. How do I debug?

I wrote the Wheezy image, booted with rPi, expanded size, rebooted. Then I played couple of games, Python Games. Then I opened the default browser, however it was slow. I only opened two pages, one ...
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1answer
514 views

Making batteries last for pi outside

I want to use the pi to analyze the moisture of my plants and decide to water or not. I want it set up in the garden. There is no power supply, so the pi will need to run on batteries. The plan is ...
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2answers
269 views

Mobile power source for RPi? [duplicate]

I have an RPi B and using a USB hub need to plug into it: A LogiLink Wifi nano USB, and 3 USB NFC readers (3*200mA=600mA) This should roughly add up to less than 3A: Power for: (RPi) + (USB Wifi) ...
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1answer
982 views

Raspberry Pi 2 - HDMI not displaying

Just recently purchased a Raspberry Pi 2 Model B 1GB. I also bought a micro SD card Kingston 16GB Class 10. I loaded up the Noobs software as instructed on: https://www.raspberrypi.org/help/noobs-...
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2answers
143 views

Resistor calulation for two LED

I want to connect two IR LED to the 3.3v output on the PI in series. I need to reduce the 3.3v to 3.0v. What kind and measure should my resistor be? I swear this is not a word problem from school......
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2answers
911 views

Switching power source from power bank to mains without interrupt

I'm planning to build a robot similar to one described here. The pi and the controller are going to be powered from powerbank. However, as big fan of live coding I am (there's gonna be some LISP ...
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1answer
1k views

Raspberry Pi 2 max USB current

I'd like to power an RPLiDAR (5V @ 230mA) and a Pixy CMU Cam5 (5V @ 120mA) Is this possible I can give it a 5V 4A powersupply if necessary. Will this burn out the Pi over time?
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Capacitor C6 dislodged

I managed to break the C6 capacitor on Raspberry Pi Model B. Its the 220uF 16V EE6 capacitor. Nobody seems to have such low capacitance, low voltage capacitor (the least I can find is 220uF and 60V). ...
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2answers
823 views

Portable power supply for a PiHub?

I love my PiHUB and would like to have a or table power source, so I can make my projects mobile :) Is there any product that I could use? It uses 3A 5.2V. Alternatively I'd appreciate any ...
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2answers
642 views

Is it correct to power the Raspberry Pi this way?

I have an embedded Raspberry Pi in an enclosure, with a micro-USB female socket (see middle picture) for power input. Is it correct to power the Raspberry Pi like this (micro-USB socket VCC to GPIO ...
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0answers
510 views

Using LED strips (many!) and mutiple power sources wiring up the ground?

So I'm using LPD8806 leds with RasPi, and we are using many many lights and need multiple power sources. With one power source, we wired the negative of the power source to a ground pin on the Pi. ...
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2answers
300 views

How much power can the Pi supply?

I am making a project in which I will be using an arduino to control several servo motors and LED's. And I ll be using a Rqspberry pi to control arduino. They will be connected serially. In this ...
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2answers
3k views

Power led randomly blinking every 1 minute on b+

I've just bought my rpi b+. Power supply for raspberry is 4.94V (which is in appropriate 4.75-5.25Vrange). Raspberry pi working good, but there is one possible trouble. I don't know why, but power ...
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3answers
3k views

Can I use an Amazon Kindle Fire power supply?

So i have a spare Kindle Fire power adapter: it's quoted as 5V @ 1.8A. I haven't tried as I don't really want to risk blowing it up!
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2answers
172 views

Shutdown RPi by plugging power (SD card mounted read-only)

I setup my RPi to boot from SD card in read-only mode. Is it safe to just unplug the power in order to shutdown? Can any components be damaged? This way I could place a switch in front of my USB ...
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5answers
2k views

Powering from a non-dedicated power source

While the quick start guide says not to power the device from a USB hub or from a computer, the only requirements for power listed are: Micro USB power supply – make sure you use a good quality one,...
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1answer
669 views

external power supply to sensors

I will be using all of the following sensors at the same time on raspberry pi b+ model with 2Amp power supply. 1) DHT-11 Digital Temperature & Humidity Sensor for temperature and humidity ...
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2answers
152 views

Would a powered USB hub for Model B work to power Model B+?

I've read somewhere that there are different power requirements for the Model B+. Question is would a powered USB hub that is currently being used to power the model B be good enough to power the ...

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