int columnPins[] = { 7, 6, 5, 4 };
int numbers[] = {1,2,3,55,4,5,6,66,7,8,9,77,88,0,99,100};
bool prevStates[16];
unsigned long pressTimes[16];
unsigned int delayTime = 20;
bool buttonsFiltered[16];
int redbright = 255;
int bluebright = 255;
int greenbright = 255;
int redPin = 3;
int bluePin = 11;
int greenPin = 10;
bool lightOn = false;
long time = 0;
bool isLight = false;

void setup() {
  for (int i = 0; i < 4; i++) {
    pinMode(rowPins[i], OUTPUT);
    pinMode(columnPins[i], INPUT_PULLUP);
  }
  Serial.begin(9600);
}

void loop() {
  for (int r = 0; r < 4; r++) {
    digitalWrite(rowPins[r], LOW);
    for (int c = 0; c < 4; c++) {
      bool buttonReading = !digitalRead(columnPins[c]);
      int buttonIndex = r * 4 + c;
      if (buttonReading != prevStates[buttonIndex]) {
    pressTimes[buttonIndex] = millis();
  }
  if (millis() - pressTimes[buttonIndex] >= delayTime) {
    if (buttonsFiltered[buttonIndex] != buttonReading) {
      buttonsFiltered[buttonIndex] = buttonReading;
      if (buttonsFiltered[buttonIndex]) {
        Serial.println(numbers[buttonIndex]);
        if ((numbers[buttonIndex] = 100) || (numbers[buttonIndex] = 77) || (numbers[buttonIndex] = 66) || (numbers[buttonIndex] = 55)){
          // lightOn = !lightOn;
          if (numbers[buttonIndex] = 55){
            analogWrite(redPin, redbright);
          }
          if (numbers[buttonIndex] = 66){
            analogWrite(redPin, redbright);
          }
          if (numbers[buttonIndex] = 77){
            analogWrite(bluePin, bluebright);
          }
        }
      }
    }
  }
  prevStates[buttonIndex] = buttonReading;
    }
    digitalWrite(rowPins[r], HIGH);
  } 

  if (lightOn) {
      if (millis()-time>1000) {
        time=millis();
        turn();
      }

  // analogWrite(redPin, redbright);
  // analogWrite(bluePin, bluebright);
  // analogWrite(greenPin, greenbright);
}
}
void turn() {
  isLight=!isLight;
  digitalWrite(13, isLight);
}