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int rows[] = {0, 1};
int columns[] = {2, 3, 4};
int pins[] = {14, 15, 16, 17, 18, 19};
void setup() {
for (int i = 0; i < 2; i++) {
pinMode(i, INPUT_PULLUP);
}
pinMode(13, OUTPUT);
for (int i=0; i<6; i++) {
pinMode(pins[i], OUTPUT);
}
}
bool key_pressed(const int key) {
const int row = key / 3;
const int column = key % 3;
pinMode(columns[column], OUTPUT);
digitalWrite(columns[column], LOW);
bool pressed = digitalRead(rows[row]) == LOW;
pinMode(columns[column], INPUT);
return pressed;
}
void loop() {
digitalWrite(13, HIGH);
for (int i=0; i<6; i++) {
if (key_pressed(i)) {
digitalWrite(pins[i], HIGH);
} else {
digitalWrite(pins[i], LOW);
}
}
}
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