Wiring
Check pinout, power supply, common GND and voltage levels before connecting the module.
Full code
const int potPin = A0;
const int ledPin = 9;
void setup() {
pinMode(ledPin, OUTPUT);
}
void loop() {
int raw = analogRead(potPin);
int pwm = map(raw, 0, 1023, 0, 255);
analogWrite(ledPin, pwm);
}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.