Hello.
The included example "RowColumnScanning" didnt work, with same pins as the Arduino.
Pin 15-20 is 13-18, i thk :/
Here is my working mod:
(function with same (real) pins on the Arduino)
// 2-dimensional array of row pin numbers:
const int row[8] = {
2, 7, 20, 5, 13, 19, 12, 17 };
// 2-dimensional array of column pin numbers:
const int col[8] = {
6, 11, 10, 3, 18, 4, 8, 9 };
// Analog input pins:
const int analogPin1 = 15;
const int analogPin2 = 16;
// 2-dimensional array of pixels:
int pixels[8][8];
// cursor position:
int x = 5;
int y = 5;
void setup() {
// initialize the analog input pins as INPUT_ANALOG
pinMode(analogPin1, INPUT_ANALOG);
pinMode(analogPin2, INPUT_ANALOG);
// 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(analogPin1), 0, 4095, 0, 7);
y = map(analogRead(analogPin2), 0, 4095, 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);
}
}