Fading

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1/*
2
3  Fading
4
5  This example shows how to fade an LED using the analogWrite() function.
6
7  The circuit:
8
9  - LED attached from digital pin 9 to ground.
10
11  created 1 Nov 2008
12
13  by David A. Mellis
14
15  modified 30 Aug 2011
16
17  by Tom Igoe
18
19  This example code is in the public domain.
20
21  https://www.arduino.cc/en/Tutorial/Fading
22
23*/
24
25int ledPin = 9;    // LED connected to digital pin 9
26
27void setup() {
28
29  // nothing happens in setup
30}
31
32void loop() {
33
34  // fade in from min to max in increments of 5 points:
35
36  for (int fadeValue = 0 ; fadeValue <= 255; fadeValue += 5) {
37
38    // sets the value (range from 0 to 255):
39
40    analogWrite(ledPin, fadeValue);
41
42    // wait for 30 milliseconds to see the dimming effect
43
44    delay(30);
45
46  }
47
48  // fade out from max to min in increments of 5 points:
49
50  for (int fadeValue = 255 ; fadeValue >= 0; fadeValue -= 5) {
51
52    // sets the value (range from 0 to 255):
53
54    analogWrite(ledPin, fadeValue);
55
56    // wait for 30 milliseconds to see the dimming effect
57
58    delay(30);
59
60  }
61}