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P that read GPIO]] Power on blue led <code bash> echo default-on > /sys/class/leds/blue/trigger </code> Power off <code bash> echo none > /sys/class/leds/blue/trigger </code> Head... _B1) (pin n°9 su J8) <code bash> # input on pin 9 echo 169 > /sys/class/gpio/export echo in > /sys/class/gpio/gpio169/direction echo rising > /sys/class/gpio/