Create a LED Dimmer

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1/*
2
3  Dimmer
4
5  Demonstrates sending data from the computer to the Arduino board, in this case
6
7  to control the brightness of an LED. The data is sent in individual bytes,
8
9  each of which ranges from 0 to 255. Arduino reads these bytes and uses them to
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11  set the brightness of the LED.
12
13  The circuit:
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15  - LED attached from digital pin 9 to ground.
16
17  - Serial connection to Processing, Max/MSP, or another serial application
18
19  created 2006
20
21  by David A. Mellis
22
23  modified 30 Aug 2011
24
25  by Tom Igoe and Scott Fitzgerald
26
27  This example code is in the public domain.
28
29  https://www.arduino.cc/en/Tutorial/Dimmer
30
31*/
32
33const int ledPin = 9;      // the pin that the LED is attached to
34
35void setup() {
36
37  // initialize the serial communication:
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39  Serial.begin(9600);
40
41  // initialize the ledPin as an output:
42
43  pinMode(ledPin, OUTPUT);
44}
45
46void loop() {
47
48  byte brightness;
49
50  // check if data has been sent from the computer:
51
52  if (Serial.available()) {
53
54    // read the most recent byte (which will be from 0 to 255):
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56    brightness = Serial.read();
57
58    // set the brightness of the LED:
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60    analogWrite(ledPin, brightness);
61
62  }
63}
64
65/* Processing code for this example
66
67  // Dimmer - sends bytes over a serial port
68
69  // by David A. Mellis
70
71  // This example code is in the public domain.
72
73  import processing.serial.*;
74
75  Serial port;
76
77  void setup() {
78
79    size(256, 150);
80
81    println("Available serial ports:");
82
83    // if using Processing 2.1 or later, use Serial.printArray()
84
85    println(Serial.list());
86
87    // Uses the first port in this list (number 0). Change this to select the port
88
89    // corresponding to your Arduino board. The last parameter (e.g. 9600) is the
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91    // speed of the communication. It has to correspond to the value passed to
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93    // Serial.begin() in your Arduino sketch.
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95    port = new Serial(this, Serial.list()[0], 9600);
96
97    // If you know the name of the port used by the Arduino board, you can specify
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99    // it directly like this.
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101    //port = new Serial(this, "COM1", 9600);
102
103  }
104
105  void draw() {
106
107    // draw a gradient from black to white
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109    for (int i = 0; i < 256; i++) {
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111      stroke(i);
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113      line(i, 0, i, 150);
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115    }
116
117    // write the current X-position of the mouse to the serial port as
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119    // a single byte
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121    port.write(mouseX);
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123  }
124
125*/
126
127/* Max/MSP v5 patch for this example
128
129----------begin_max5_patcher----------
130
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176
177-----------end_max5_patcher-----------
178
179*/