PWM Test for UNO R3B pin 2

/*
 Fading

 This example shows how to fade an LED using the analogWrite() function.

 The circuit:
 * LED attached from digital pin 9 to ground.

 Created 1 Nov 2008
 By David A. Mellis
 modified 30 Aug 2011
 By Tom Igoe

 http://arduino.cc/en/Tutorial/Fading

 This example code is in the public domain.

 */


int ledPin = 2;    // LED connected to digital pin 9

void setup() {
  // nothing happens in setup
}

void loop() {
  // fade in from min to max in increments of 5 points:
  // ต้องใส่ 255 ก่อนการเรียกใช้งาน
  analogWrite(ledPin, 255);
  analogWrite(ledPin, 32); delay(200);
  analogWrite(ledPin, 128); delay(200);
}