Is there a way to dim/turn off the LEDs?
Posted: Mon Jan 28, 2019 2:03 pm
by stsinc
Hi,
Just a cosmetic issue: the Nanopi M4 has two very red and green LEDs that keep on flashing.
Two questions:
Why are they flashing continuously? Is there something wrong?
Is there a way to dim or even turn off the flashing LEDs, at least when the board is working continuously (OK when starting up)?
Best,
Stephen
Re: Is there a way to dim/turn off the LEDs?
Posted: Mon Jan 28, 2019 6:45 pm
by pavelectric
Hello Stephen.
Similar work of all LEDs is the norm.
Red - constantly on, not blinking, this is a kind of power indication, or rather, device operation.
Green - blinking, it is said that the device is working (loading and / or doing calculations).
Disable them ... theoretically, this can be done programmatically, but 99% that the manufacturer does not advise how to do this.
Some users of boards of another company (Korean) asked the manufacturer on the contrary - to output the signals of these LEDs to the GPIO pins, the manufacturer did it.
In general, stick a piece of dark tape to the LEDs, and everything will not be so bright.
P.S. they sometimes bring me discomfort too.
Sincerely, Pavel.
Re: Is there a way to dim/turn off the LEDs?
Posted: Mon Jan 28, 2019 8:43 pm
by guidol
you could try to switch they off like in the following sample (use the led-names of the Neo4 if available):
Code: Select all
root@npi-neo2-23(192.168.6.23):~# cd /sys/class/leds
root@npi-neo2-23(192.168.6.23):/sys/class/leds# ls -l
insgesamt 0
lrwxrwxrwx 1 root root 0 Jan 1 1970 nanopi:green:status -> ../../devices/platform/leds/leds/nanopi:green:status
lrwxrwxrwx 1 root root 0 Jan 1 1970 nanopi:red:pwr -> ../../devices/platform/leds/leds/nanopi:red:pwr
root@npi-neo2-23(192.168.6.23):/sys/class/leds# more /sys/class/leds/nanopi:red:pwr/trigger
none kbd-scrolllock kbd-numlock kbd-capslock kbd-kanalock kbd-shiftlock kbd-altgrlock kbd-ctrllock kbd-altlock kbd
-shiftllock kbd-shiftrlock kbd-ctrlllock kbd-ctrlrlock usbport usb-gadget usb-host disk-activity disk-read disk-wr
ite ide-disk mtd nand-disk [heartbeat] cpu cpu0 cpu1 cpu2 cpu3 default-on panic mmc0 0.2:07:link 0.2:07:1Gbps 0.2:
07:100Mbps 0.2:07:10Mbps
root@npi-neo2-23(192.168.6.23):/sys/class/leds# echo 'none' > /sys/class/leds/nanopi:red:pwr/trigger
root@npi-neo2-23(192.168.6.23):/sys/class/leds#
maybe this will only work if you use armbian for your Neo
Re: Is there a way to dim/turn off the LEDs?
Posted: Mon Jan 28, 2019 11:13 pm
by stsinc
Thanks to all! There is actually a simple way to dim/turn off the lights on a raspi.
Will try your code.
Best,
Stephen