ACT led

[Ronny Nilsson]

Hi Gilles
The ACT LED flashes with about 0.5 Hz when everything is working normally. 
This is called a "heartbeat" and is very common in headless embedded systems 
(those missing a computer screen). A change in frequency indicate problems. 
It has no relation with the SD card. You can however modify the ACT  LED 
behavior if you want. Both "restoring" to SD card activity indicator as well 
as manual control is possible.

/Ronny


---------------------------------------------
>   With nard operating normally, should the ACT led be pulsing continuously?
>
>   The ACT led is documented to be a "card status" led, flashing during
> SD card activity:
>
> https://elinux.org/R-Pi_Troubleshooting
>
>   On the other hand, the nard doc says:
> "When the green ACT led flashes on and off slowly it has finished booting.
> (About 20 seconds from power-on.)"
>
> After booting, should it continue flashing? Or does it really mean that
> there is SD card activity?
>
>
> ~ Gilles