nwmedia-c262-lab7.ino

#define PIN_MOTOR 9
#define PIN_PIEZO 10
#define PIN_BIT0 A0
#define PIN_BIT1 A1
#define PIN_BIT2 A2
#define PIN_BIT3 A3
#define PIN_BIT4 A4
#define PIN_BIT5 A5

const long FREQS[64] = {
    65,   69,   73,   78,   82,   87,   93,   98,   104,  110,  117,
    123,  131,  139,  147,  156,  165,  175,  185,  196,  208,  220,
    233,  247,  262,  277,  294,  311,  330,  349,  370,  392,  415,
    440,  466,  494,  523,  554,  587,  622,  659,  698,  740,  784,
    831,  880,  932,  988,  1047, 1109, 1175, 1245, 1319, 1397, 1480,
    1568, 1661, 1760, 1865, 1976, 2093, 2217, 2349, 2489};

bool bits[5][6] = {{0, 0, 0, 0, 0, 0},
                   {0, 0, 0, 0, 0, 0},
                   {0, 0, 0, 0, 0, 0},
                   {0, 0, 0, 0, 0, 0},
                   {0, 0, 0, 0, 0, 0}};
bool updated = false;

void setup() {
  pinMode(PIN_BIT0, INPUT);
  pinMode(PIN_BIT1, INPUT);
  pinMode(PIN_BIT2, INPUT);
  pinMode(PIN_BIT3, INPUT);
  pinMode(PIN_BIT4, INPUT);
  pinMode(PIN_BIT5, INPUT);
  pinMode(PIN_MOTOR, OUTPUT);
  Serial.begin(9600);
  analogWrite(PIN_MOTOR, 32);
}

void loop() {
  copyArray(bits[0], bits[1]);
  copyArray(bits[1], bits[2]);
  copyArray(bits[2], bits[3]);
  copyArray(bits[3], bits[4]);
  int val0 = analogRead(PIN_BIT0);
  int val1 = analogRead(PIN_BIT1);
  int val2 = analogRead(PIN_BIT2);
  int val3 = analogRead(PIN_BIT3);
  int val4 = analogRead(PIN_BIT4);
  int val5 = analogRead(PIN_BIT5);
  Serial.println(String(val0) + ", " + String(val1) + ", " + String(val2) +
                 ", " + String(val3) + ", " + String(val4) + ", " +
                 String(val5));

  bits[4][0] = val0 < 150;
  bits[4][1] = val1 < 500;
  bits[4][2] = val2 < 800;
  bits[4][3] = val3 < 1000;
  bits[4][4] = val4 < 1000;
  bits[4][5] = val5 < 950;
  Serial.println(String(bits[4][0]) + ", " + String(bits[4][1]) + ", " +
                 String(bits[4][2]) + ", " + String(bits[4][3]) + ", " +
                 String(bits[4][4]) + ", " + String(bits[4][5]));

  for (size_t i = 0; i < 6; ++i) {
    if (bits[0][i] != bits[1][i] || bits[1][i] != bits[2][i] ||
        bits[2][i] != bits[3][i] || bits[3][i] != bits[4][i] ||
        bits[4][i] != bits[0][i]) {
      if (!updated) {
        // noTone(PIN_PIEZO);
      }
      updated = false;
      return;
    }
  }

  if (!updated) {
    int index = 0;
    for (size_t i = 0; i < 6; ++i) {
      if (bits[4][i]) {
        index |= 1 << (5 - i);
      }
    }
    if (index > 20) {
      Serial.println("Index: " + String(index));

      long freq = FREQS[index];
      Serial.println("Freq: " + String(freq));
      tone(PIN_PIEZO, freq, 1000);
      updated = true;
    }
  }
}

void copyArray(bool* target, bool* source) {
  for (size_t i = 0; i < 5; ++i) {
    target[i] = source[i];
  }
}