int led = 4;
int brightness = 0;
int fadeAmount = 5;
void setup()
{
pinMode(4, OUTPUT);
Serial.begin(9600);
}
void loop()
{
analogWrite(4, brightness);
brightness = brightness + fadeAmount;
if (brightness <= 0 || brightness >= 255)
{
fadeAmount = -fadeAmount;
}
Serial.println(brightness);
delay(10);
}