Signals for on Boad LEDs

balli1187

Hi Forum,

i have some questions about the LEDs on the Banana Pi Pro. There is one for power, one for network and another one i don't know its function.
I have read how they can be disabled and how they can be triggered bei GPIO.

My question is, how can bring the signal to an external LED (via GPIO-Pin). I have build a custom Case with LEDs and i want to bring the network-signal, eg to these external LED.

Has somebody done this before?

Best regards from germany,
Stephan

swipon

There are 3 leds; power, sd card i/o, network i/o

I think you can use signal from kernel:

You can read the status with:

1. cat /sys/class/leds/led0/brightness

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verify if there is a trigger:

1. cat /sys/class/leds/led0/trigger
   
2. none [mmc0]

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For change value of leds if there is trigger you have to disable it:

1. echo none >/sys/class/leds/led0/trigger

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Then you can set the power led value:

1. echo 1 >/sys/class/leds/led0/brightness
   
2. echo 0 >/sys/class/leds/led0/brightness

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And status led value:

1. echo 1 >/sys/class/leds/led1/brightness
   
2. echo 0 >/sys/class/leds/led1/brightness

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To return to the trigger function (like a reset):

1. echo mmc0 >/sys/class/leds/led0/trigger

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Or you can control directly with GPIO:

1. echo gpio | sudo tee /sys/class/leds/led1/trigger

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Hope it's useful.
Luca

banana_jack

I am interested in this, too: I would like to connect external LEDs to the Banana and clone the ones on board.

But it doesn't seem that simple, as this:

cat /sys/class/leds/led0/brightness
cat: /sys/class/leds/led0/brightness: No such file or directory