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Questions tagged [board-leds]

For questions pertaining to the onboard LEDs of the Raspberry Pi (PWR, ACT and ETH)

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raspberry pi 3 B v1.2 not booting no led light and heating on the backside

I haven't used the pi for a few month now , it was stored in good condition. so yesterday i flashed the SD card with rasbian bullseye and booted up the pi. every thing was normal except the wifi , i ...
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3 votes
1 answer
78 views

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: [...
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1 answer
103 views

Bare metal LED access on RPi 4

I've been playing with the Baking Pi tutorials, getting assembly code to work on the [bare metal] Pi 1 (BCM2835). I'm now interested in adapting the code to work on the Pi 4 BCM2711 but I'm struggling ...
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1 answer
161 views

Can't turn off onboard LED on Pi Zero anymore

I used to be able to turn off the green on-board LED with the following commands: echo none | sudo tee /sys/class/leds/led0/trigger echo 1 | sudo tee /sys/class/leds/led0/brightness This no longer ...
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  • 39
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1 answer
178 views

rfkill* LED triggers. What does it mean?

$ cat /sys/class/leds/led1/trigger none rc-feedback kbd-scrolllock kbd-numlock kbd-capslock kbd-kanalock kbd-shiftlock kbd-altgrlock kbd-ctrllock kbd-altlock kbd-shiftllock kbd-shiftrlock kbd-...
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0 answers
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Raspberry Pi A+ does not boot

I have a Raspberry Pi A+ that does not boot. When I supply power both the ACT and PWR leds light up and stay on (no blinking). I get no image on the screen whatsoever. I tried: Formatting and ...
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-2 votes
1 answer
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3B+ locking up (blank video output) with red & green LEDs solid, requiring reboot. Which logs to check? [closed]

My Pi 3B+ (full config details at link) has started to lock up out of the blue (red and green LEDs on), requiring a reboot. Which system log(s) do I check to see what the problem might be?
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1 answer
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Program Crashes on Systemd (systemctl), Works Fine Running Manually

I have a program (c program, run using a shell script) that uses sockets to connect to a server, retrieve data (on an interval) and (based on that data) power an LED matrix. When I run this program ...
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138 views

Raspberry Pi 3 Model B Hung / Frozen, Including Clock?

I just happened to check on a Raspberry Pi 3 Model B with Raspbian Jessie 4.9.35-v7+ this morning and found it unresponsive. IIRC, there is an LED that is normally on when the Pi is on, so I thought ...
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  • 357
2 votes
1 answer
429 views

Control on-board led triggers from python

I know the trigger for on-board leds can be controlled from the command-line (or a script) I have a python program that I want to temporarily take over the system led blink it a little and return ...
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  • 121
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1 answer
3k views

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 ...
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14 votes
4 answers
3k views

How to identify a Pi

I have a stack of five Pis, each of which have a separate hostname and are on the same network. I need to physically identify each Pi from another Pi, perhaps by flashing the onboard LEDs in a ...
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1 vote
1 answer
205 views

Problem with LED blink program on Pi [closed]

I am completely new to RPi and stuck unexpectedly. I am trying to create a simple python program to make my LED blink. Here are the two programs which are giving same outputs on terminal when I ...
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  • 74
11 votes
3 answers
23k views

Turning off LEDs on Raspberry Pi 3

I need to disable all LEDs on my Raspberry Pi 3s otherwise they interfere with the operation of my camera setup. I use Raspbian Jessie. I can successfully use the following code: echo 0 >/sys/...
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2 votes
2 answers
352 views

Do the Ethernet lights show error codes?

My moel B is flashing all three network lights (FDX, LNK and 100) toghether about once per second. Is this an error message? There is a cable plugged in but there appears to be a break somewhere ...
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2 answers
1k views

raspberry v3.0, model B read red led status

How can I read the status of the on board red led in raspberry 3.0 model B? Thank you
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2 votes
1 answer
1k views

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 ...
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3 votes
4 answers
234 views

Raspberry pi leds does not blink and the ic gets hot

I bought my raspberry pi 3 model B 4 months back. It was working perfectly but one day, when I was working on pi, all of a sudden, it stopped working. After that day, when I am trying to power it up ...
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1 answer
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Can someone explain what the values are and where they are found?

I'm trying to follow along with this OS building tutorial. I'm trying to understand what the LED_ values in rpi-gpio.h mean and how they are all used. Where in the documentation are these values ...
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  • 109
1 vote
1 answer
810 views

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 ...
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1 answer
805 views

Replace ACT- and PWR-Led on Raspberry Pi 3

I somehow broke off the ACT- and the PWR-Leds from my Raspberry Pi 3. It's still working fine, but i want to solder some new ones on. What kind of Led do i need?
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1 answer
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PiGlow script in Python doesn't work

I just bought a PiGlow and a Pibrella, and I was curious how it worked. I imported a few Python scripts from this link, but none of the scripts does work. When I run one of the scripts, I get the ...
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  • 131
5 votes
1 answer
3k views

How to read the status of the Power-LED on Raspberry Pi 3 with Python

How to read the status of the Power-LED (or the rainbow square - if you like that better) on Raspberry Pi 3 to detect an low-voltage-condition in a python script? Since the wiring of the Power-LED has ...
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  • 151
0 votes
3 answers
164 views

Bad Raspberry boards?

I'm the owner of 5 Raspberry boards. Four of them work flawless. The fifth board regularly refuses to respond to pings or SSH. Sometimes it comes up after a few minutes waiting. It has no firewall ...
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  • 286
1 vote
0 answers
83 views

Red light only when plugging Pi2 into AV-Receiver via HDMI, TV works

When I try to plug my Pi2 into my A/V receiver via HDMI and plug in my power cable afterwards, the red light lights up, afterwards the green light lights once and then nothing. When I plug in the ...
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0 votes
1 answer
539 views

Blinking PWR when not enough current available?

I'm not sure whether I've seen mention of this here before or not. Anyway, I have a B+ with max_usb_current=1 enabled so I can run an external USB drive off it. There's never been a problem with ...
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6 votes
4 answers
9k views

How can I control the red LED again

I just acquired the latest Pi-3. In the Pi B+ and Pi 2 it was possible to access both the red and green LED through /sys/class/leds/led0 and /sys/class/leds/led1. After setting up the Pi 3, I have ...
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