To control on the GPIO pins:

• The external GPIOs are available under the /sys/class/gpio folder in Linux.

• To control on the GPIO pins you need to calculate the GPIO number XX and run the commands below:

This is an example code for accessing the GPIOs on the ClearFog Base/Pro:

#An example for gpio 22

# Export GPIO XX
cd /sys/class/gpio/ 
echo 22 > export 

cd gpio22/ 

# Set GPIO pin Direction
echo out > direction 

# Set the value of an output pin
echo 0 > value