Arduino示例代码讲授：Row-Column Scanning an 8x8 LED matrix with X-Y input LED矩阵

Row-Column Scanning an 8x8 LED matrix with X-Y input LED矩阵

这段代码是一个Arduino示例步伐，用于通过行-列扫描控制一个8x8的LED矩阵。它利用两个模拟输入（比方电位器）来控制光标的位置，并在LED矩阵上表现光标的位置。

1. /*
2.   Row-Column Scanning an 8x8 LED matrix with X-Y input
4. This example controls an 8x8 LED matrix using two analog inputs
6. created 27 May 2009
7. modified 30 Aug 2011
8. by Tom Igoe
10. This example works for the Lumex  LDM-24488NI Matrix. See
11. http://sigma.octopart.com/140413/datasheet/Lumex-LDM-24488NI.pdf
12. for the pin connections
14. For other LED cathode column matrixes, you should only need to change
15. the pin numbers in the row[] and column[] arrays
17. rows are the anodes
18. cols are the cathodes
19. ---------
21. Pin numbers:
22. Matrix:
23. * Digital pins 2 through 13,
24. * analog pins 2 through 5 used as digital 16 through 19
25. Potentiometers:
26. * center pins are attached to analog pins 0 and 1, respectively
27. * side pins attached to +5V and ground, respectively.
29. This example code is in the public domain.
31. http://www.arduino.cc/en/Tutorial/RowColumnScanning
33. see also http://www.tigoe.net/pcomp/code/category/arduinowiring/514 for more
34. */
36. // 2-dimensional array of row pin numbers:
37. const int row[8] = {
38.    
39.    
40.   2, 7, 19, 5, 13, 18, 12, 16
41. };
43. // 2-dimensional array of column pin numbers:
44. const int col[8] = {
45.    
46.    
47.   6, 11, 10, 3, 17, 4, 8, 9
48. };
50. // 2-dimensional array of pixels:
51. int pixels[8][8];
53. // cursor position:
54. int x = 5;
55. int y = 5;
57. void setup() {
58.    
59.    
60.   // initialize the I/O pins as outputs
61.   // iterate over the pins:
62.   for (int thisPin = 0; thisPin < 8; thisPin++) {
63.    
64.    
65.     // initialize the output pins:
66.     pinMode(col[thisPin], OUTPUT);
67.     pinMode(row[thisPin], OUTPUT);
68.     // take the col pins (i.e. the cathodes) high to ensure that
69.     // the LEDS are off:
70.     digitalWrite(col[thisPin], HIGH);
71.   }
73.   // i

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