int rows[] = {32, 33, 25};
int cols[] = {19, 18, 5, 17};

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  for (int i = 0; i < 3; i++) {
    pinMode(rows[i], OUTPUT);
    digitalWrite(rows[i], HIGH);
  }

  for (int i = 0; i < 4; i++) {
    pinMode(cols[i], INPUT_PULLUP);
  }

}

void loop() {
  for (int i = 0; i < 3; i++) {
    digitalWrite(rows[i], LOW);
    for (int j = 0; j < 4; j++) {
      if (digitalRead(cols[j]) == LOW) {
        Serial.print("Row " + String(i) + " Col " + String(j) + "  PRESSED!");
        Serial.println(digitalRead(cols[j]));
      }
      delay(10);
    }
    digitalWrite(rows[i], HIGH);
    // Serial.print("Col " + String(i) + " value: ");
    // Serial.println(digitalRead(cols[i]));
    // delay(1000); // this speeds up the simulation
  }
}