/* Potensiometer — atur kecerahan LED (PWM) */ const int potPin = A0;   // wiper potensiometerconst int ledPin = 9;    // LED pada pin PWM int potValue   = 0;int brightness = 0; void setup() {  pinMode(ledPin, OUTPUT);} void loop() {  potValue = analogRead(potPin);  brightness = map(potValue, 0, 1023, 0, 255);  analogWrite(ledPin, brightness);  delay(50);}