Управление GPIO2:
sudo echo 2 > /sys/class/gpio/export
echo "out" > /sys/class/gpio/gpio2/direction
echo "1" > /sys/class/gpio/gpio2/value
echo "0" > /sys/class/gpio/gpio2/value
echo "in" > /sys/class/gpio/gpio2/direction
cat /sys/class/gpio/gpio2/direction