Raspberry Pi Stack Exchange
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Questions tagged [activity-led]

The green activity LED blinks on both read and write activity on the SD card. On newer models it is connected to a GPIO expander , which is connected via I²C to the SoC.

The green activity LED blinks on both read and write activity on the SD card. On newer models it is connected to a GPIO expander , which is connected via I²C to the SoC.

When using Linux, the activity LED can be assigned to other "triggers" instead. See the discussion below.

Blinking the activity LED is a good first exercise for bare-metal programmers, that is people writing their own Operating Systems/drivers or people seeking microcontroller-like control over their RPi.

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Can't turn on ACT LED on baremetal Pi3

I'm trying to run some bare-metal code on my raspi 3. This is my first time doing any sort of bare-metal programming, so first things first I want to turn on my ACT led as a kind of hello-world type program but I can't for the life of me get it to…
Ripread
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Use both internal and external activity LED?

With something like dtoverlay=act-led,gpio=26 in boot/config.txt I can enable an external activity LED, which is useful if the Pi is in a case and the on-board LED cannot be seen. Unfortunatelly, this disables the internal LED, so when the external…
PMF
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Normal Work of RPi 3B+

I am newbie and i want to understand watching only on indicators, is Rpi 3 B+ work quite well? I mean, are green and red lights should glowing both permanently together or red light can glows permanently and green light can fades meanwhile? Also,…
tcma13
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Pi 3 on-board LEDs

Can I make one of the LEDs on the Ethernet port do the same thing as the ACT led? The case I've got my Pi in, does not allow me to see the ACT led so I do not know when its okay to cut the power after shutting down the Pi. I can't seem to find out…
kyran bullard
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rPi 3B+ boots with no activity light or ethernet

I’ve been using a 3B+ headless for several months. Yesterday I rebooted like I normally do using sudo shutdown -r now. It shut down, but wouldn’t boot up again. I figured I had done something to the SD, so I formatted a brand new SD card with…
JohnWickham
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RPi 4B ACT solid green

I am new to raspberry pi and I recently decided to get RPi 4B. Anyways, I was doing a small project and when I finished, I pulled the jumper wires from the breadboard and the wire connected the GND and 5.0v touched which caused the RPi to reset.…
WarHawk
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Raspberry Pi 3 Model A+ Faint green pinprick light steady flashing

I just loaded an SD Card with Raspbian lite for the Pi3 Model A+. It does the normal rainbow screen splash, followed by the 4 raspberries and a blinking cursor underneath. The pi never completes its bootup. The power led stays constant and…
RenegadeAndy
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Turn off onboard LEDs at boot

I know very little about Raspberry Pi and Python. I've been able to turn off the LEDs in the terminal using the following command: sudo su - echo none > /sys/class/leds/led0/trigger However, I would like to incorporate that into a Python program…
WhiskyJack
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Send PWM signal from Raspberry Pi 3 BEFORE boot

I am using my raspberry pi 3 to run some services. When someone powers on the Raspberry I want to use RGB LEDs to indicate the status instead of using a LCD screen to output messages. The LEDs I plan on using are digital meaning I can turn the first…
Tono Nam
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Raspberry Pi 3 will not load SD Card

I have a very strange problem and have gone through 2 pi's atm. I have Raspberry Pi 3, I put an OMV imageon it [1]. The first time I boot up the Raspberry Pi it outputs and has a Kernal error: I try rebooting it with different SD Cards and…
ZUKINI
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Green Led (ACT) is blinking for mmc0 without SD card activity

The green led (ACT) on my Raspberry Pi 3 is set to mmc0 to flash on SD card activity via echo mmc0 |sudo tee /sys/class/leds/led0/trigger However, it flashes much more often (randomly every few seconds) than it should according to iotop -bktoqqq…
Frank Breitling
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How to power a Raspberry Pi 4 through usb c or gpio pins?

Hello everyone I am running into some kind of problem. I want to power my Pi 4B+ through the GPIO pins via a buck converter but it just wont work. I used the LM2596 non adj 5V buck. In its typical application form. And I also bought the LM2596 adj…
Luuk Benningshof
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Raspberry Pi 4: exchange power LED with activity LED

the default situation with the two LEDs on my Raspberry Pi 4 is as such: [situation now] Green LED: read and write activity of my SD card Red LED: Power I would like to change the the LEDs to: [desired situation] Green LED: Power Red LED: Read…
wechsler
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Audio Injector stereo soundcard is preventing boot

I recently bought a Audioinjector stereo soundcard HAT to stream sound on my raspberry pi running Raspbian. I went to their website and installed the .deb installer file and ran it with audioInjector-setup.sh and then rebooted as it told me.…
Avan Bowen
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Why the green LED is not blinking properly on Raspberry Pi 3 Model B running Arch Linux ARM from USB?

After installing Arch Linux ARM on Raspberry Pi 3 model B, everything is working as expected but the green LED that indicates the SD card read write activity. The LED just blinks every second for 0.1 seconds and continues. After installation, I did…
15 Volts
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