Sure I understand, Igor. I'm not in a hurry for my OPI3, it's a real pleasure to make this board work. If I can help in your work, don't hesitate to tell me. For example, I've found a way to adress GPIO pins withour installing WiringOP/WiringPi library. I use /sys/class/gpio , export, unexport, and so on. I have written a short daemon in C to send "1" to a GPIO Pin to control a fan. I use a fan, a transistor (to trigger the fan), a resistor, a flyback diode to protect the transistor when the fan is stopping, and to make this circuit more fun, I control another GPIO to light a LED when the fan is running!
I love working with my boards, everyday I learn something new!!!