Comparing onewire 4x4 keypad password

Projects Programming
17

And here is an 'AnalogKeypad' example sketch that might make you analog keypad work more like a matrix Keypad:

class AnalogKeypad
{
  public:

    AnalogKeypad(int ap, int keyCount, const char *keyChars, const int *keyValues) :
      AnalogPin(ap), KeyCount(keyCount), KeyChars(keyChars), KeyValues(keyValues)
    {
      lastChar = 0;
    };

    char getKey()
    {
      int value = analogRead(AnalogPin);

      if (value < KeyValues[0])
      {
        lastChar = 0;
        return 0;
      }

      for (int i = 1; i <= KeyCount; i++)
      {
        if (value < KeyValues[i])
        {
          if (KeyChars[i] != lastChar)
          {
            lastChar = KeyChars[i];
            return lastChar;
          }
        }
      }
      lastChar = 0;
      return 0;
    };


  private:
    const int AnalogPin;
    const int KeyCount;
    const char *KeyChars;
    const int *KeyValues;
    int lastChar;
};




const int KeypadPin = A0;
const int KeyCount = 16;
const int AnalogValues[KeyCount + 1] = {};
const char KeyChars[KeyCount + 1] = "123A456B789C*0#D";

AnalogKeypad keypad(KeypadPin, KeyCount, KeyChars, AnalogValues);

void setup()
{
  Serial.begin(115200);  /* Define baud rate for serial communication */
}

void loop()
{
  char key = keypad.getKey();
  if (key != 0)
    Serial.print(key);
}