PWM LED Fade

Wire it up

Disconnect power before changing connections. Follow terminal names rather than wire colors.

The complete sketch

void setup() { pinMode(9, OUTPUT); }
void loop() {
  for (int value = 0; value <= 255; value++) {
    analogWrite(9, value);
    delay(5);
  }
  for (int value = 255; value >= 0; value--) {
    analogWrite(9, value);
    delay(5);
  }
}

The launch buttons use this same code and a matching saved circuit.

Build it step by step

1. Open a complete project

   Launch in Simulator creates a separate Uno sketch and its matching wired circuit. Existing sketches are preserved. Press Run to compile and execute.

2. Explore the live circuit

   Watch a complete rise and fall, then change delay(5) to alter the fade speed.

3. Try it on hardware

   Disconnect power while wiring. Match terminal names in the table, select the exact board, Verify, then connect and upload. Check component ratings and power requirements first.

Understand the sketch