Arduino for command

// Dim an LED using a PWM pin
int PWMpin = 10;  // LED in series with 470 ohm resistor on pin 10

void setup() {
  // no setup needed
}

void loop() {
  for (int i = 0; i <= 255; i++) {
    analogWrite(PWMpin, i);
    delay(10);
  }
}

Source: arduino.cc

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