what is setValue function for?

Hi

I try to find how the setValue function works but I can't find description about this function..

how does it works?

Can you add some context? That's not a core function so it must come from some library you have installed. What library is that?

Here is one: http://playground.arduino.cc/Code/LED

void setValue(byte val) Assumes a PWM pin, and trigger a analogWrite()