Salida PWM (pulse width modulation)

El segundo ejemplo a usar es 'fading',

// Fading LED
// by BARRAGAN

int value = 0; // variable to keep the actual value
int ledpin = 9; // light connected to digital pin 9

void setup()
{
// nothing for setup
}

void loop()
{
for(value = 0 ; value <= 255; value+=5) // fade in (from min to max) { analogWrite(ledpin, value); // sets the value (range from 0 to 255) delay(30); // waits for 30 milli seconds to see the dimming effect } for(value = 255; value >=0; value-=5) // fade out (from max to min)
{
analogWrite(ledpin, value);
delay(30);
}
for(value = 255 ; value >= 0; value-=5)
{
analogWrite(ledpin, value);
delay(30);
}
}