Raspberry Pi has few built-in LEDs such as PWR and ACT. It is a great device indicator but, blinking LEDs at night can be an annoyance. Also, LEDs consumes a little bit of power.
This tutorial explains how to turn off built-in LEDs on Raspberry Pi 4.
Raspberry Pi 4 Model B has integrated power LED (PWR), activity LED (ACT) and two Ethernet socket LEDs: link LED (LNK) and activity LED (ACT). The following table presents the purpose of each LED:
|1.||PWR||Red||Power indicator. Is always on if enough power (> 4.65V).|
|2.||ACT||Green||Memory card status indicator. It blinks during memory card activity.|
|3.||LNK (Ethernet)||Amber||Ethernet link indicator. It is always on when Ethernet is connected.|
|4.||ACT (Ethernet)||Green||Ethernet status indicator. It blinks during network activity.|
Raspberry Pi has a configuration file
/boot/config.txt which contains parameters that are read when the Raspberry Pi boots. Open this file:
sudo nano /boot/config.txt
Add the following lines to the end of the file to turn off built-in LEDs on Raspberry Pi when it boots:
# Turn off PWR LED dtparam=pwr_led_trigger=default-on dtparam=pwr_led_activelow=off # Turn off ACT LED dtparam=act_led_trigger=none dtparam=act_led_activelow=off # Turn off Ethernet ACT LED dtparam=eth_led0=4 # Turn off Ethernet LNK LED dtparam=eth_led1=4
Reboot Raspberry Pi in order the changes to take effect: