Wiring
Check pinout, power supply, common GND and voltage levels before connecting the module.
Full code
const int ledPin = 9;
void setup() {
pinMode(ledPin, OUTPUT);
}
void loop() {
for (int value = 0; value <= 255; value++) {
analogWrite(ledPin, value);
delay(10);
}
}How it works
This lesson matches the page title and gives a clean starting point for this exact example.
Common mistakes
Check board selection, wiring, libraries, power supply and serial monitor baud rate.