int ledPin = 2; // GPIO2
void setup() {
// nothing happens in setup
}
void loop() {
for (int fadeValue = 0 ; fadeValue <= 255; fadeValue += 5) {
analogWrite(ledPin, fadeValue);
delay(30);
}
for (int fadeValue = 255 ; fadeValue >= 0; fadeValue -= 5) {
analogWrite(ledPin, fadeValue);
delay(30);
}
}