//                             seven segment
const byte numeral[10] = { B11111100, // 0
                           B01100000, // 1
                           B11011010, // 2
                           B11110010, // 3
                           B01100110, // 4
                           B10110110, // 5
                           B10111110, // 6
                           B11100000, // 7
                           B11111110, // 8
                           B11110110, // 9
                         };

const int segmentPins[8] = { 2, 11, 10, 5, 4, 3, 8, 9 }; //dp,g,f,e,d,c,b,a

void showdigit(int number) {
  boolean isBitSet;
  for (int segment = 1; segment < 8; segment++) {
    isBitSet = bitRead(numeral[number], segment);
    // isBitSet will be true if given bit is 1
    digitalWrite(segmentPins[segment], isBitSet);
    digitalWrite(segmentPins[0], HIGH);
  }
}

void setup() {
  for (int i = 0; i < 8; i++) {
    pinMode(segmentPins[i], OUTPUT); // set segment and DP pins to output
  }
}

void loop() {
  for (int i = 0; i <= 9; i++) {
    showdigit(i);
    delay(1000);
  }
}




/*

                                debounce

  int SettledValue = LOW;
  int previousButtonState = LOW;
  long lastChangeTime = 0;
  long debounceDelay = 0.5;
  int buttonState;

  void setup() {
  // put your setup code here, to run once:
  pinMode(4, INPUT);
  Serial.begin(9600);
  }

  void loop() {
  // put your main code here, to run repeatedly:
  buttonState = digitalRead(4);

  if (buttonState != previousButtonState) {
    lastChangeTime = millis();
  }
  if ((millis() - lastChangeTime) > debounceDelay) {
    if (buttonState != SettledValue) {
      SettledValue = buttonState;
      if (SettledValue == HIGH) {
        Serial.println("Button Pressed");
      }
    }
  }
  previousButtonState = SettledValue;
  }




                                Button
  void setup() {
  pinMode(8,INPUT);
  Serial.begin(9600);
  }

  void loop() {
  int BSTATE= digitalRead(8);
  if(BSTATE == HIGH){
  Serial.println(("button bushed"));
  }
  }

                                KEYPAD
  #include <Keypad.h>

  const byte row = 4;
  const byte col = 4;

  char keys[row][col] = {{'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'}, {'7', '8', '9', 'C'}, {'*', '0', '#', 'D'}
  };

  byte rowpin[row] = {9,8,7,6};
  byte colpin[col] = {5,4,3,2};

  Keypad coustomKeypad = Keypad(makeKeymap(keys),rowpin,colpin,row,col);

  void setup() {
  Serial.begin(9600);
  }

  void loop() {
  char coustomKey = coustomKeypad.getKey();
  if(coustomKey){
  Serial.println(coustomKey);
  }
  }
*/