27 votes

Make "iw wlan0 set power_save off" permanent

I did it by simply adding a line to /etc/rc.local /sbin/iwconfig wlan0 power off Add that ahead of exit 0 and it will run at every boot.
Dougie's user avatar
  • 5,311
25 votes
Accepted

Make "iw wlan0 set power_save off" permanent

Power save mode was an issue years ago on older versions of Raspbian. But it is fixed for a long time. Now it is disabled by default with the WiFi driver brcmfmac. You will find it if you grep the ...
Ingo's user avatar
  • 42.1k
11 votes
Accepted

What is the minimum power required for an RPi 4 in `halt` or `shutdown`?

Q1: Is it possible to realize the claimed current draw of "about 3 mA" in any inactive state? A1: No - at least not with the tools covered in the "Official Documentation". To frame ...
Seamus's user avatar
  • 22k
9 votes
Accepted

Will RPI3 power down an external USB hard disk if not used for a certain amount of time?

Yes. Here's what I use: hdparm -B 127 /dev/sda hdparm -S 242 /dev/sda From the command line as the pi user you would have to add sudo there. The first line enables spin down. The second one sets ...
goldilocks's user avatar
  • 58.9k
8 votes

How much energy does the Raspberry Pi consume in a day?

Power Consumption Benchmarks The instrument used to measure power consumption with the Dramble and individual Raspberry Pis: PowerJive USB Power Meter In all measurement cases, nothing is plugged ...
Raghav Dinesh's user avatar
7 votes
Accepted

RPi 3 - Reduce power consumption

As far as I know, you can not disable only one USB. When you turn USBs power off, also the Ethernet port turned off. I don't know if there is a way to disable USB/Ethernet in config.txt, but in cmd ...
aitechone's user avatar
  • 151
6 votes

Powering a Raspberry Pi from a vehicle battery 24/7

The Pi draws about 300mA at 5V, plus whatever your GPS unit would draw. Ignoring the small losses associated with a (switching) step-down converter. Say a total of 2W. That would be equivalent to ...
JayEye's user avatar
  • 1,898
6 votes

Raspberry Pi 3 Model B+ got hot even in idle

51 deg C is actually reasonably cool for a Pi3. My Pi4 regularly runs at over 60 deg C. Don't worry about it.
CoderMike's user avatar
  • 6,982
6 votes
Accepted

Does Raspberry Pi 4 consume considerable amount of power in soft-off state?

The Pi has 3 "components" the CPU, GPIO and Video Core which are relatively independent. Even when the Pi is shutdown the Video Core continues to run, and the GPIO pins retain their state; ...
Milliways's user avatar
  • 60k
6 votes
Accepted

Starting Pi 4 with global_en

The Organization's schematic is incomplete, but it does show GLOBAL_EN connected to U2 - the PMIC (Power Management Integrated Circuit). Pulling GLOBAL_EN low (aka shorting to GND) resets the PMIC - ...
Seamus's user avatar
  • 22k
5 votes

Pi Headless: How to confirm that the Pi is shut down

In Raspberry Pi 3 you can trun off the PWR LED with echo 0 | sudo tee /sys/class/leds/led0/brightness If the Pi is shut down, the LED will turn on again.
Christian's user avatar
  • 259
5 votes

Powering a Raspberry Pi from a vehicle battery 24/7

I just wanted to let you know that I actually did this and had some bad results. The upvoted answer is correct that your battery will last a long time while powering the Pi. What he doesn't mention ...
JT Hundley's user avatar
5 votes

Is it possible to toggle 3.3V and 5V header pins on and off?

No it is not possible to toggle the power rails in software. They are both powered whilst the Pi is powered. Look at the schematics for your model here.
joan's user avatar
  • 71k
4 votes

RPI3 USB port current?

See Raspberry Pi Power Limitations for detail of the Pi3 power. NOTE the Pi3 SHOULD be able to power, but my experience indicates this is not so. It is a combination of PSU which don't actually ...
Milliways's user avatar
  • 60k
4 votes
Accepted

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

So, you choose this ups here: http://www.cdrking.com/index.php?mod=products&type=view&sid=16847&main=140 Which sadly won't give any information on how large the Power Storage is (Mostly in ...
alsternerd's user avatar
4 votes

How can enable Deep sleep mode in Rasberry PI

As is the Raspberry Pi doesn't support a Deep Sleep mode as you describe it. Most of these modules can all be disabled, but the savings are minimal and they will all require a restart to toggle on or ...
Jacobm001's user avatar
  • 11.9k
4 votes
Accepted

Raspberry pi powering issues

In the right top corner of the connected lcd screen, there is a small yellow thunder icon constantly. What does it stand for and more importantly, how to turn it off? Connect to an adequate supply! ...
Milliways's user avatar
  • 60k
4 votes

Make "iw wlan0 set power_save off" permanent

This is still relevant for me when I want to use the RPi headless and log in through SSH, as there are no input devices plugged in and power management kicks in too early. Sometimes I couldn't log in ...
Bim's user avatar
  • 151
4 votes

What is the purpose of PD_SENSE in the Raspberry Pi 4 power circuit?

PD_SENSE will tell the RPi it is connected to a USB-C compliant host. This could be used to detect (a) when the RPi is powered via the GPIO connector or (b) when the RPi is connected to a USB host ...
Dmitry Grigoryev's user avatar
4 votes

RPi 3 - Reduce power consumption

This is an exercise in futility! Disabling devices will make very little difference in power usage, which is mainly determined by processor load. About the ONLY device which will have any affect is ...
Milliways's user avatar
  • 60k
3 votes
Accepted

Can the 5V and 3.3V power pins be used to power multiple devices?

Yes, the 5V and 3V3 power rails may be used to power multiple devices. The power rails are not switchable, power is always available while the Pi is powered. The amount of power available from the ...
joan's user avatar
  • 71k
3 votes
Accepted

Power Supply for PI Zero

Just because it can supply 2.4 Amps doesn't mean it will. The Raspberry Pi Zero will draw what it needs to operate and no more. (unless you create a short circuit somewhere...) There's a great table/...
KennetRunner's user avatar
  • 1,050
3 votes

How do I turn my pi3 back on?

The only way to restart the Pi are:- Cycle power, or Connect a switch to the reset pins on the Pi If neither of these suits you DO NOT TURN OFF; the Pi uses less power than most devices (TV, ...
Milliways's user avatar
  • 60k
3 votes
Accepted

Pi 2 Question about power

As Ghanima mentioned, splitting a 1 A power supply between a Raspberry Pi 2, and an external hard drive is unlikely to perform well. Further, the capacity of the drive isn't likely to make much of a ...
Jacobm001's user avatar
  • 11.9k
3 votes

Check if current if flowing through 220v ac wire

Because you are talking about a 220V Alternating Current power source, you can use any electronic component that measures induction (changes in electrical field) to make this check. You could ...
Phil B.'s user avatar
  • 5,043
3 votes

Log undervoltage

When in headless mode, you can read out the diagnostic messages through the command line. If there is undervoltage, the dmesg command will output something like: ... [47124.394081] Under-voltage ...
Cloudkollektiv's user avatar
3 votes
Accepted

Screen Blanking on console in Raspbian Stretch (Debian 9)

Either add consoleblank=0 to the kernel command line or use this command: TERM=linux setterm -blank 0 >> /etc/issue (/etc/issue is displayed on each tty before login, this will disable the ...
pim's user avatar
  • 622
3 votes
Accepted

Autonomous Raspberry Pi

It depends on how much current the Raspbery Pi consumes and that depends on: Raspberry Pi version What is running on the Raspberry Pi Any add-on hardware The theoretical approach is : Power (watt) =...
MatsK's user avatar
  • 2,791
3 votes

Raspberry pi 12v relay

The pictures and text on the eBay page you have linked imply that the relay you have bought should work for your application. I say that because they do claim (at least) that the product is set up for ...
Seamus's user avatar
  • 22k
3 votes

Power RPi from a Battery: On/off via UI or Sleep?

First, the bad news: Currently, only the RPi4B has what might be considered a "sleep mode". And at 40mA, or approximately 5 watt-hours per day, this could only be considered "sleep mode&...
Seamus's user avatar
  • 22k

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