Reply To: Use external LED to indicate activity (heartbeat) on RPi3B+

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FeinRib premium
2. Dezember 2019 at 20:19 #47655

This is how it works.
Edit /boot/config.txt and add this:

# Redirect activity LED to an external LED connected to GPIO5
dtoverlay=pi3-act-led,gpio=5
dtparam=act_led_trigger=heartbeat

# Disable PWR LED
dtparam=pwr_led_trigger=none
dtparam=pwr_led_activelow=off

I disabled the power LED also on that occasion.
This thread can be considered solved.