const uint8_t n = 11;   // row size

// rows are analog inputs with 10k resistor to GND.
uint8_t rowPins[n] = { 1, 2, 3, 4, 11, 12, 13, 14 };  // row pins.
// columns are digital pins connected to the sensor inputs.
uint8_t colPins[n] = { 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5 }; // col pins.

int ldr[n][n];
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

void setup() {

  analogReadResolution(14);

  Serial.begin(115200);

  for (uint8_t i = 0; i < n; i++) {
    for (uint8_t j = 0; j < n; j++) {

      pinMode(rowPins[i], OUTPUT);
      pinMode(colPins[j], INPUT);
    }
  }
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void loop() {

  for (uint8_t i = 0; i < 8; i++) {
    for (uint8_t j = 0; j < n; j++) {

      pinMode(rowPins[i], INPUT_PULLDOWN);   // enable rows...

      ldr[i][j] = analogRead(rowPins[i]);

      int sensorValue = ldr[j][i];

      Serial.print(sensorValue);
      Serial.print("   ");

      pinMode(rowPins[i], OUTPUT);  // disable rows..

      delay(100);
    }
    Serial.println();
  }
  Serial.println();

}