blob: 5b76bdd79a6b5aa4194e0caa87d6e573ff2d4f41 (
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const int rows[] = {4, 5};
const int kRows = 2;
const int columns[] = {6, 7};
const int kColumns = 2;
bool buttons[] = {false, false, false, false};
void setup() {
for (int i = 0; i < kRows; i++) {
pinMode(rows[i], INPUT_PULLUP);
}
for (int i = 0; i < kColumns; i++) {
pinMode(columns[i], INPUT);
}
Serial.begin(9600);
}
bool scanKey(int row, int column) {
pinMode(columns[column], OUTPUT);
digitalWrite(columns[column], LOW);
bool pressed = digitalRead(rows[row]) == LOW;
pinMode(columns[column], INPUT);
return pressed;
}
void loop() {
// pinMode(4, INPUT_PULLUP);
// if (digitalRead(4) == LOW) {
// Serial.print("pushed: ");
// Serial.println(columns[0]);
// } else {
// Serial.println("not pushed");
// }
for (int i = 0; i < kRows; i++) {
for (int j = 0; j < kColumns; j++) {
bool pressed = scanKey(i, j);
if (pressed != buttons[i * kColumns + j]) {
if (pressed) {
Serial.print("Button pressed: ");
} else {
Serial.print("Button released: ");
}
Serial.println(i * kColumns + j);
buttons[i * kColumns + j] = pressed;
}
}
}
}
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