I had a look at the context of the project. What they mean is: The duration of the fading proces is linked to the time a button is pressed. for example, If the button is pressed for 2 seconds then the fading proces takes 2 seconds.
This is the code I currently have
/*
Fading
This example shows how to fade an LED using the analogWrite() function.
The circuit:
- LED attached from digital pin 9 to ground.
created 1 Nov 2008
by David A. Mellis
modified 30 Aug 2011
by Tom Igoe
This example code is in the public domain.
http://www.arduino.cc/en/Tutorial/Fading
*/
int ledR = 9; // LED connected to digital pin 9
int ledG = 10;
int ledB = 11;
void setup() {
}
void loop() {
// fade in from min to max in increments of 5 points:
for (int fadeValue = 0 ; fadeValue <= 255; fadeValue += 5) {
// sets the value (range from 0 to 255):
analogWrite(9, fadeValue);
// wait for 30 milliseconds to see the dimming effect
delay(30);
}
// fade out from max to min in increments of 5 points:
for (int fadeValue = 255 ; fadeValue >= 0; fadeValue -= 5) {
// sets the value (range from 0 to 255):
analogWrite( 9, fadeValue);
// wait for 30 milliseconds to see the dimming effect
delay(30);
}
// fade in from min to max in increments of 5 points:
for (int fadeValue = 0 ; fadeValue <= 255; fadeValue += 5) {
// sets the value (range from 0 to 255):
analogWrite(10, fadeValue);
// wait for 30 milliseconds to see the dimming effect
delay(30);
}
// fade out from max to min in increments of 5 points:
for (int fadeValue = 255 ; fadeValue >= 0; fadeValue -= 5) {
// sets the value (range from 0 to 255):
analogWrite( 10, fadeValue);
// wait for 30 milliseconds to see the dimming effect
delay(30);
}
// fade in from min to max in increments of 5 points:
for (int fadeValue = 0 ; fadeValue <= 255; fadeValue += 5) {
// sets the value (range from 0 to 255):
analogWrite(11, fadeValue);
// wait for 30 milliseconds to see the dimming effect
delay(30);
}
// fade out from max to min in increments of 5 points:
for (int fadeValue = 255 ; fadeValue >= 0; fadeValue -= 5) {
// sets the value (range from 0 to 255):
analogWrite( 11, fadeValue);
// wait for 30 milliseconds to see the dimming effect
delay(30);
}
}