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Questions tagged [power-management]

Power Management is a feature of electrical appliances to enter a low-power state when inactive to reduce energy consumption.

22 questions with no upvoted or accepted answers
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1answer
459 views

Which Linux driver does control the PMIC of the Raspberry Pi 3B+?

The Raspberry Pi 3B+ contains the MaxLinear (previously Exar) MxL7704 power management chip (PMIC) with I2C interface for "on-line" reconfiguration of power sequencing and internal voltages.1 This is ...
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0answers
53 views

Trouble connecting USB devices with Raspberry Pi Compute Module on custom PCB

I am working with a team designing a PCB that works with the Raspberry Pi Compute Module 3 card. We are having a bit of trouble with the USB ports. The schematic of the USB portion is somewhat similar ...
2
votes
1answer
132 views

Run turn off/on HDMI on specific time

I want to do the following: Use my raspberry pi as a smart display, kind off like what the Chromecast does when it's not streaming anything. I also want it to turn on and off at certain times, like ...
1
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0answers
90 views

Issues with the IOT Bit 4G hat

I would like to have some internet connection everywhere with my Raspberry Pi. To do so I bought the IOT Bit 4G hat for the rasoberry Pi ( https://www.mouser.be/new/altitude-technology/altitude-tech-...
1
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0answers
139 views

How to do I reenable display sleep?

I recently installed a Hyperpixel touchscreen on my Raspberry Pi 3, but I don't want to leave the screen on 24/7 to avoid damage and because an always-on display doesn't fit my use case. Before I put ...
1
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0answers
486 views

How to turn display on and off on Windows IoT?

I've got a Windows IoT UWP app wherein a motion detector will turn the display on if someone is in proximity, and then turn off after a period of no motion detected. The LCD in question is this one. ...
1
vote
1answer
2k views

Reduce power consumption script

I have read on this blog that you can reduce power consumption: https://www.jeffgeerling.com/blogs/jeff-geerling/raspberry-pi-zero-conserve-energy By disabling the HDMI port. He says that I should ...
1
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0answers
52 views

How to determine from hardware, when I can shut off a Raspberry Pi 3

I am wiring up a raspberry pi to use a battery supply and I would like it to be a single switch controlling its power. Obviously, I don't want to cut power when its running, but I also don't want two ...
1
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0answers
611 views

Temporarily put a Pi into energy efficient mode (disable HDMI, avoid X Windows)

I want to deploy a RPi 3 in quasi-headless mode, i.e. no display attached, with an application running that takes time-lapse photos (with the standard camera module). Power is supplied through a ...
1
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0answers
831 views

Control USB power from Pi

I would like to control USB LED currently pluged into power socket from my Pi. I understand that it is not possible to simply switch ON/OFF given USB port on Pi. So is there some way, I could modify ...
1
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2answers
87 views

how do I automatically power off the raspberry pi and cut power every night and then power it back on each day?

Background I'm a student working on research project to develop a remote wireless sensor network of data loggers. Each data logger (aka node) is going to be retrofitted to a bird feeder that reads ...
1
vote
1answer
137 views

Where to connect PWR_LOW_N?

We're developing a compute module board, and added the undervoltage circuit. Unfortunately, I cannot find where to PWR_LOW_N is actually connected. I have found some saying it's connected to GPIO 35 ...
0
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0answers
32 views

USB Power Draw Plug In Order

I'm having some issues running a USB webcam and a USB speaker at the same time. If I plug in my webcam second, both devices work perfectly fine. If I simply boot with both plugged in, the speaker ...
0
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0answers
90 views

Power management in Windows IOT

Because my project is in the field and not in a lab, power consumption is a significant issue. According to specification an idle Raspberry Pi 3B+ bare board has a current draw of 330mA. The ...
0
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0answers
223 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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0answers
6k views

wlan0 not associated and No wireless interface found

I have a Raspberry Pi 3 with built-in wifi card. When I do run ifconfig I can find the wlan0 device. Before I never had a wifi problem until I connected the Raspberry Pi to my TV through the HDMI port....
0
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1answer
95 views

Killing Power at GDM3 Login

I understand that killing power to a running pi without first shutting down can damage the SD card. Can Killing power at the GDM3 login screen also damage my SD card or do I need to run the GDM3 ...
0
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1answer
176 views

How many amps does a pi with 11 sensors need?

I have received so much support from this community by reading already answered questions. But now I got one that hasn't been asked yet. I have nearly a dozen sensors connected to my pi 3 so it's only ...
0
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1answer
43 views

3.5" TFT screen keeps hibernating

I have been working with my RasPI 3 (using Jessie) for a little while on a project that I am SO CLOSE to finishing. Right now the main problem I am having is that I cannot keep the frigging screen ...
0
votes
1answer
116 views

How to connect 2 boards to a raspberry pi 3

I am building a home console stereo and I am going to use an RPi3 with a hifiberry dac+. And I am wondering if I can use a waveshare power relay to be able to control the power to the system from my ...
0
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2answers
59 views

Raspberry pi power issuses

i just want to supply power for other devices which uses 5 v dc from the raspberry pi by cutting and soldering the wires and also i want to connect all the USB ports with mouse keyboard WI-FI dongle ...
-2
votes
2answers
49 views

Help with resistors

I have a raspberry pi 3 that runs on 5.1v but I have a battery that is 7.4v, what transistor do I need so I don't fry the rpb3?