实验材料:

  • Arduino 主控板
  • 8 x 8 点阵屏 x 1 个
  • 电位器 x 2 个
  • 面包线
  • 面包板

实验电路:

 

代码:

 

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

For other LED cathode column matrixes, you should only need to change
the pin numbers in the row[] and column[] arrays

rows are the anodes
cols are the cathodes
---------

Pin numbers:
Matrix:
* Digital pins 2 through 13,
* analog pins 2 through 5 used as digital 16 through 19
Potentiometers:
* center pins are attached to analog pins 0 and 1, respectively
* side pins attached to +5V and ground, respectively.

This example code is in the public domain.

http://www.arduino.cc/en/Tutorial/RowColumnScanning

see also http://www.tigoe.net/pcomp/code/category/arduinowiring/514 for more
*/

// 2-dimensional array of row pin numbers:
const int row[8] = {
2,7,19,5,13,18,12,16 };

// 2-dimensional array of column pin numbers:
const int col[8] = {
6,11,10,3,17,4,8,9 };

// 2-dimensional array of pixels:
int pixels[8][8];

// cursor position:
int x = 5;
int y = 5;

void setup() {
// initialize the I/O pins as outputs
// iterate over the pins:
for (int thisPin = 0; thisPin < 8; thisPin++) {
// initialize the output pins:
pinMode(col[thisPin], OUTPUT);
pinMode(row[thisPin], OUTPUT);
// take the col pins (i.e. the cathodes) high to ensure that
// the LEDS are off:
digitalWrite(col[thisPin], HIGH);
}

// initialize the pixel matrix:
for (int x = 0; x < 8; x++) {
for (int y = 0; y < 8; y++) {
pixels[x][y] = HIGH;
}
}
}

void loop() {
// read input:
readSensors();

// draw the screen:
refreshScreen();
}

void readSensors() {
// turn off the last position:
pixels[x][y] = HIGH;
// read the sensors for X and Y values:
x = 7 - map(analogRead(A0), 0, 1023, 0, 7);
y = map(analogRead(A1), 0, 1023, 0, 7);
// set the new pixel position low so that the LED will turn on
// in the next screen refresh:
pixels[x][y] = LOW;

}

void refreshScreen() {
// iterate over the rows (anodes):
for (int thisRow = 0; thisRow < 8; thisRow++) {
// take the row pin (anode) high:
digitalWrite(row[thisRow], HIGH);
// iterate over the cols (cathodes):
for (int thisCol = 0; thisCol < 8; thisCol++) {
// get the state of the current pixel;
int thisPixel = pixels[thisRow][thisCol];
// when the row is HIGH and the col is LOW,
// the LED where they meet turns on:
digitalWrite(col[thisCol], thisPixel);
// turn the pixel off:
if (thisPixel == LOW) {
digitalWrite(col[thisCol], HIGH);
}
}
// take the row pin low to turn off the whole row:
digitalWrite(row[thisRow], LOW);
}
}