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6 votes
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Can't turn on ACT LED on baremetal Pi3

Models A and B The green activity LED (GPIO 16) may be written. Models A+ and B+ The green activity LED (GPIO 47) may be written. The red power LED (GPIO 35) may be written. The high USB power mode ...
joan's user avatar
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3 votes

Turn off onboard LEDs at boot

I found a work around that simply allows me to add a few lines to the boot config file /boot/config.txt To disable ACT LED, add dtparam=act_led_trigger=none dtparam=act_led_activelow=off To disable ...
WhiskyJack's user avatar
3 votes
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Send PWM signal from Raspberry Pi 3 BEFORE boot

PWM (Pulse Width Modulation) applies to digital as well as analogue signals. Individually addressable LED strips, such as you want to use, are not controlled by PWM signals. They are controlled by ...
joan's user avatar
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2 votes

Pi 3 on-board LEDs

Having done some research myself I can't seem to come across any resources that explain how the LEDS work. I suspect the LEDs are something that are hardwired into the Ethernet port and are not ...
Darth Vader's user avatar
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2 votes
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Use both internal and external activity LED?

An alternative answer to duplicating a led is to create another in /boot/config.txt using dtoverlay=gpio-led[,gpio|label|trigger|active_low]=<val> eg. dtoverlay=gpio-led,gpio=25,label=...
Jassman23's user avatar
2 votes
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Raspberry Pi not booting - red power light, no ACT light

If you want to fault find see The Boot Problems Sticky It is possible, but unlikely, that the Pi "might be done for" but it is far more likely that the OS file system is damaged. I suggest ...
Milliways's user avatar
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2 votes

raspberry pi no rainbow screen

There's been a few reports of RPi 3Bs where there's no 3.3V power supply from the on-board voltage regulator. If you have a multimeter check between pin #1 and pin #6 on the GPIO header (carefully ...
Dougie's user avatar
  • 5,333
2 votes
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I inverted 2 GPIO pins. Is pi4 dead?

I think you mean "shorted" and not inverted. And yes, this is fatal for the PMIC (power management IC). Your Pi is dead.
kwasmich's user avatar
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2 votes
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Normal Work of RPi 3B+

The red LED is the power indicator, it should be on whenever you have your pi plugged in. The green LED is the sd card access indicator; it goes on when the pi is accessing the sd card (which is like ...
Benjamin Ashbaugh's user avatar
1 vote

How to power a Raspberry Pi 4 through usb c or gpio pins?

I bought a 12v - 5v converter for a few bucks on Amazon, and used the connector from an 18650 LiPO battery on the 5v and Ground pins on my Pi 4b. I've got a 12v 5a power supply from a dumpster running ...
user163293's user avatar
1 vote

Pi 4 booting but no green LED blinking

With Raspberry Pi OS I believe by default it only blinks with SD card activity.
joan's user avatar
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1 vote
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Raspberry Pi 4: exchange power LED with activity LED

QUESTION - How to change LED function: Green LED: Power (indicate power is applied) Red LED: (indicate) Read and write activity of my SD card ANSWER: Add the following lines to your /boot/config.txt ...
Seamus's user avatar
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1 vote
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Pi 3B+ External Activity LED

You can re-route the act led to a GPIO pin by adding the act-led overlay to /boot/config.txt. Example setting act-led to GPIO18: dtoverlay=act-led,gpio=18 Info (see e.g. /boot/overlays/README) Name: ...
Dirk's user avatar
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1 vote

RPi 4B ACT solid green

If the LED blinks 4 times when you power it on with NO SD card is inserted, there is a chance that you have an SD card error: https://www.raspberrypi.org/forums/viewtopic.php?t=250183 ... had solid ...
Paamand's user avatar
  • 111
1 vote

RPi 4B ACT solid green

Your RPi4B is dead. The fix will cost somewhere between £35 and £55 depending which model you've shot dead. Never pull wires off a powered up Raspberry. Power down first. Check wiring, check it again ...
Dougie's user avatar
  • 5,333
1 vote

Raspberry Pi 3 Model A+ Faint green pinprick light steady flashing

Okay - the problem was a silly one. I just unzipped the raspbian lite img file and copy pasted the disk image. I decided to reformat the sd, and use etcher to write the entire img file to the sd, ...
RenegadeAndy's user avatar
1 vote

Can't turn on ACT LED on baremetal Pi3

Expanding joan's answer: Raspberry Pi 3 B+ (1 GiB RAM) and A+ (512 MiB RAM) The green activity LED (GPIO 29) may be written The red power LED is connected to MXL7704 power management IC and is not ...
iBug's user avatar
  • 315
1 vote

Green Led (ACT) is blinking for mmc0 without SD card activity

I have also asked this question Why is the green LED (ACT) blinking without SD card activity also at the Raspberry Pi Forum and received this answer: by rpdom » Wed Feb 22, 2017 8:02 pm From what I ...
Frank Breitling's user avatar

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